Delaware, 2023

Flood in Delaware, December 17 to 19, 2023

December 17 to 19, 2023 · NWS PHI · 1 event in 1 county or zone

A strengthening coastal low pressure system brought several rounds of rain to the region Sunday night into Monday (December 17-18th). 00 inches.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PHI wrote it up.

A strengthening coastal low pressure system brought several rounds of rain to the region Sunday night into Monday (December 17-18th). Total rainfall amounts across the forecast area varied from about 1.50 inches up to 7.00 inches. The heaviest rains fell across southern Delaware up through the coastal plain of New Jersey. This heavy rain fell on already saturated soils. As a result, river flooding was prevalent across the Passaic Basin, Raritan Basin, and southeast Pennsylvania basins including the Schuylkill and Brandywine. The Brandywine flooding extended in to Delaware. Smaller streams and rivers across northern New Castle County in Delaware, such as the Christina, Red Clay, and White Clay also flooded.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Dec 17, 8:59 PM EST, 1 hour 1 minute earlier.

Area forecast discussion, Dec 17, 8:59 PM EST, 1 hour 1 minute before
Area Forecast Discussion
National Weather Service Mount Holly NJ
859 PM EST Sun Dec 17 2023

.SYNOPSIS...
Low pressure to the south will continue to strengthen as it moves
across our region overnight. The low will then lift into eastern
Canada on Monday. An upper trough with a surface cold front will
pass through the region on Tuesday. High pressure then builds east
through the end of the work week. Another weak cold front may approach
for Saturday.

&&

.NEAR TERM /THROUGH MONDAY/...
Latest analysis places a rapidly strengthening area of low pressure
(991 millibars) just off the coast of North Carolina. This system
is the only real factor in our forecast through the near term as
it continues strengthening and barrels northward toward us tonight.
Developing coastal front looks to straddle the CWA on an almost
north-south alignment and will result in the low pressure crossing
our region from south-southwest to north- northeast. The exact
track will influence exactly where the strongest winds and heaviest
rains fall, with the strongest winds likely just southeast of
the track over coastal areas and the heaviest rains just
northwest. Have generally maintained existing headlines as they
were in good shape and guidance has not shifted in any major way.
Rainfall continues across the region this evening and will remain
with us overnight and become heavy at times. This is also when
the strongest winds will be affecting coastal areas as the roaring
low-level jet becomes strongest just as the low is passing across
the region. There is just enough instability and more than enough
forcing to bring a few thunderstorms into the forecast, and its
not out of the question one of them could bring some stronger
winds to the surface. The SPC has outlined portions of the
region just east of the low track in a marginal risk of severe
weather early Monday for this reason. Still think that overall,
the winds will be more on the gale/wind advisory level given the
relatively stable fetch off the ocean limiting mixing, though
its granted that it won't take much to get some 50 knotters down
to sea level.

Heaviest rain, possibly in excess of 4 inches, looks most likely
just west of the low track near and northwest of I-95. Flood watch
remains in effect and many of the smaller rivers and streams are
now forecast to reach minor flood stage by the Mid- Atlantic River
Forecast Center. Will need to watch this closely as given saturation
from the recent rains, if rainfall over-performs we may have
some moderate flooding on our hands.

The bottom line is that anyone planning to be out and about
later overnight into Monday morning, including commuters, should
be extremely cautious, and if possible, change their travel times.
Road closures due to flooding and downed trees are quite possible
by early Monday. If you live near a flood-prone stream or small
river, you also should keep aware of the latest forecasts and
warnings given high potential for flooding.

The low will pull northeast of the region during Monday, with
winds swinging around to west-northwest. While coastal areas may
see strongest winds on the southeasterly low-level jet overnight,
areas near and northwest of I-95 probably see strongest winds
after the low passes, and they may approach 45 mph during the
midday and afternoon Monday. Given the likely saturated soils by
then, this can result in tree damage even if it doesn't technically
reach wind advisory criteria (46 mph gusts). Otherwise, drying
out and a little clearing possible by the end of the day Monday.

Temps will be steady or rising tonight with 50s common, and 60s
looking likely along the coast east of the track. Temps peak in
the morning Monday then drop as the system pulls away and cold
advection gets underway.

&&

.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
While the Tuesday and Wednesday period won't have nearly as
many weather hazards as what we are about to see over the next
day, there are still a few things to be aware of, including the
potential for some very light snow, primarily in the higher
terrain.

On the heels of the coastal low, another mid and upper level
trough will approach our region, this time from the NW. A low is
expected to close off in the base of this trough by Monday
night or Tuesday, and may start to become negatively tilted, but
looks like it remains relatively progressive over our region,
with any impacts being primarily confined to Monday night and
Tuesday.

As for the impacts, the main one will be very light
precipitation. Because this is digging in from the NW, arriving
just behind the start of dry air advection, expect this to be
quite moisture starved. So any precipitation that we see Monday
night and Tuesday will be very light. None the less, it will be
cold enough across much of the region that there could be a few
snow flakes mixed in with rain drops especially Monday night
into early Tue morning. However, a combination of warm ground
and limited moisture means that only the southern Poconos has a
decent chance (50%) of seeing any accumulating snow, and even
there amounts are expected to be less than one inch.

Additionally, Tuesday should be breezy. The tightest low/mid
level height gradient and tightest surface pressure gradient
never quite line up perfectly, so max wind gusts are likely to
be in the 25 to 30 mph range (possibly as high as 35 mph on
ridge lines).

Once this trough slides east of our region Tuesday night into
Wednesday, it should kick off a return to dry conditions and
seasonable temperatures.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
The trend of dry and seasonable is expected to continue
Thursday and Friday as a broad surface high pressure system will
gradually build eastward towards our region.

In the upper levels, a broad ridge becomes entrenched over the
eastern U.S.. Several models depict a short wave trough sliding
eastward to the south of the ridge, which could result in
precipitation by next weekend, but once again, moisture will be
limited. Additionally, depending on how robust the ridge is, the
short wave trough may weaken as it tries to undercut it. All
that being said, stayed with the previous forecast in keeping
slight chance pops on Saturday.

&&

.AVIATION /02Z MONDAY THROUGH FRIDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Deteriorating conditions through tonight as widespread heavy
rain moves into the region, with the worst conditions after 5Z.
LIFR likely with cigs and vsby thanks to the heavy rain. Winds
likely get gusty for KACY and KMIV, possibly as far inland as
KPHL, late tonight, with low-level wind shear as well thanks to
very strong low-level southeasterly jet. Lighter winds and
less wind shear at KABE/KRDG. Moderate confidence.

Monday...conditions improve as low pulls away. IFR to LIFR due
to heavy rain to start improves slowly to MVFR or possibly VFR
by day's end. Winds become west-northwest by afternoon and may
gust up to 35 kts. Moderate confidence.

Outlook...
Monday night through Tuesday...prevailing VFR, though some
brief MVFR or even IFR visibility conditions are possible under
any snow or rain showers through this time. Highest risk is at
KABE, KRDG, and KTTN. SW winds 10 to 15 KT becoming
northwesterly 10 to 20 mph with gusts up to 30 mph. Moderate
confidence on the overall pattern, but low confidence on timing
of visibility restrictions.

Wednesday through Friday...VFR. NW winds 5 to 15 kt. High
confidence.

&&

.MARINE...
Strong southeasterly flow will reach gale force easily tonight
with isolated storm-force winds possible. Gale Warning remains
in effect. Seas will build as well with waves exceeding 15 feet
possible late tonight into Monday. Winds shift westerly and
remain or near gales behind the system as we head later in the
day Monday. Isolated thunderstorms also possible later tonight
into Monday morning.

Outlook...
Monday night through Tuesday...SCA conditions are expected on
all waters both due to NW winds gusting up to 30 kt, and
elevated seas primarily on the Atlantic coastal waters.

Tuesday night through Friday...Once winds diminish, no
additional SCA conditions are likely on the Delaware Bay. On the
Atlantic coastal waters elevated seas may linger for most, if
not all of this period.

&&

.HYDROLOGY...
Flood Watch remains in effect for our entire area for tonight
and Monday. Heaviest rain continue through early Monday morning.

While a strong storm will cross the region, the exact track will
determine where the heaviest rain falls especially regarding if
one or more bands of heavier rain sets up. Rainfall totals of
2.0 to 4.0 inches are forecast across the region with the highest
amounts along and north/west of the I-95 corridor. Some locally
higher amounts are probable. Rainfall amounts were increased a
bit more overall. Given that this new rainfall will be onto saturated
ground, there is a high flooding risk and this will be enhanced
especially if much of the heavier rain falls in a shorter period
of time. The highest hourly rainfall rates are expected to occur
over the next 3 to 5 hours into early Monday morning. We will
need to watch especially the quicker responding creeks and streams,
and some creeks/rivers in eastern Pennsylvania and northern New Jersey
are forecast to get into minor flooding. In addition, higher rainfall
rates could increase the flooding risk in urban areas.

&&

.TIDES/COASTAL FLOODING...
A buildup of water will occur along the coasts due to a persistent
and increasing east to southeast flow ahead of the strong coastal
storm approaching from the south. Coastal Flood Advisories already
went into effect to cover the first high tide of concern, with water
levels peaking from late this morning into early this afternoon. The
anomaly on top of this first astronomical high tide was a little
lower than forecast, though just about all our sites did reach the
level where 'spotty minor' flooding occurs.

The next high tide will be around 11 PM to 2 AM tonight (time
depending on the exact coastal location). From an astronomical tide
perspective, this will actually be a 'secondary' or lower tide than
either of the Sunday/Monday midday high tides. That will prevent any
coastal flooding along most of the NJ shore north of Ocean City
tonight. However, the greater concern for this event will be along
portions of Delaware Bay, where we have Coastal Flood Warnings
hoisted, as the surge of water up the bay due to those southeast
winds may be significant enough to counter the 'lower' astronomical
tide, and still result in MODERATE flooding. That said, the latest
trends in observations and model guidance suggest that threat may be
lower than earlier forecast, and water levels may struggle to get to
that moderate/warning-criteria level. Still, given the potential, we
will keep the warning in place.

Heading into the final high tide of concern around late Monday morning
into early afternoon, the areas at risk of coastal flooding will 'flip'.
As the surface low pressure center passes by, winds will shift to
west-northwest, first over Delaware and DE Bay by mid- morning. That
should begin to lower the surge anomaly on top of the astronomical
tide levels, especially around Delaware. However, that may not lower
enough to prevent at least minor flooding, particularly along the
NJ coast, and especially around the 'back bays', including Barnegat
Bay. In fact, due to a combination of freshwater runoff from the
heavy rain overnight, the surge being slower to drain out of the
bay, and westerly winds pushing the water toward the bay- side of
the barrier island, we are keeping an eye out for localized MODERATE
flooding for that high tide. For that area, we have an Advisory out
for now, not a Warning, but we will keep a close eye on trends there.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch through Monday afternoon for PAZ054-055-060>062-
     070-071-101>106.
NJ...Coastal Flood Warning until 6 AM EST Monday for NJZ016-021.
     Flood Watch through Monday afternoon for NJZ001-007>010-
     012>027.
     Coastal Flood Advisory until 4 PM EST Monday for NJZ012>014-
     020-022>027.
     Wind Advisory until 7 AM EST Monday for NJZ022>025.
     Wind Advisory from midnight tonight to 7 AM EST Monday for
     NJZ013-014-020-026-027.
DE...Coastal Flood Warning until 6 AM EST Monday for DEZ001-002.
     Flood Watch through Monday afternoon for DEZ001>004.
     Coastal Flood Advisory until 4 PM EST Monday for DEZ003-004.
     Wind Advisory until 7 AM EST Monday for DEZ003-004.
MD...Flood Watch through Monday afternoon for MDZ012-015-019-020.
MARINE...Gale Warning until 6 PM EST Monday for ANZ430-431-450>455.

&&

SYNOPSIS...Johnson/RCM
NEAR TERM...RCM/po
SHORT TERM...Johnson
LONG TERM...Johnson
AVIATION...Johnson/RCM
MARINE...Johnson/RCM
HYDROLOGY...
TIDES/COASTAL FLOODING...
Hazardous weather outlook, Dec 17, 4:47 PM EST, 5 hours 13 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
0447 PM EST Sun Dec 17 2023

DEZ001-182147-
New Castle-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for New Castle County in Delaware.

.DAY ONE...Through tonight.

Moderate coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ002-182147-
Kent-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Kent County in Delaware.

.DAY ONE...Through tonight.

Moderate coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ003-182147-
Inland Sussex-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for inland portions of Sussex County
in Delaware.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ004-182147-
Delaware Beaches-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal portions of
Sussex County in Delaware.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ054-182147-
Carbon-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Carbon County in Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ055-182147-
Monroe-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Monroe County in Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ060-182147-
Berks-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Berks County in Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ061-182147-
Lehigh-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Lehigh County in Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ062-182147-
Northampton-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Northampton County in
Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ070-182147-
Delaware-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Delaware County in Pennsylvania.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ071-182147-
Philadelphia-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Philadelphia County in
Pennsylvania.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ101-182147-
Western Chester-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for western Chester County in
Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ102-182147-
Eastern Chester-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for eastern Chester County in
Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ103-182147-
Western Montgomery-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for western Montgomery County in
Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ104-182147-
Eastern Montgomery-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for eastern Montgomery County in
Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ105-182147-
Upper Bucks-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for upper Bucks County in
Pennsylvania.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

PAZ106-182147-
Lower Bucks-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for lower Bucks County in
Pennsylvania.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ001-182147-
Sussex-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Sussex County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ007-182147-
Warren-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Warren County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ008-182147-
Morris-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Morris County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ009-182147-
Hunterdon-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Hunterdon County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ010-182147-
Somerset-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Somerset County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ012-182147-
Middlesex-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Middlesex County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ013-182147-
Western Monmouth-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for western Monmouth County in New
Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ014-182147-
Eastern Monmouth-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for eastern Monmouth County in New
Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Monday. Localized beach erosion
is possible.
Life-threatening swimming conditions in the surf zone
and significant beach erosion are expected on Tuesday.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ015-182147-
Mercer-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Mercer County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ016-182147-
Salem-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Salem County in New Jersey.

.DAY ONE...Through tonight.

Moderate coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ017-182147-
Gloucester-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Gloucester County in New Jersey.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ018-182147-
Camden-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Camden County in New Jersey.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ019-182147-
Northwestern Burlington-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for northwestern Burlington County in
New Jersey.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ020-182147-
Ocean-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for inland portions of Ocean County
in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ021-182147-
Cumberland-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Cumberland County in New Jersey.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ022-182147-
Atlantic-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for inland portions of Atlantic
County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ023-182147-
Cape May-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Cape May County excluding the
Atlantic coast in New Jersey.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ024-182147-
Atlantic Coastal Cape May-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal portions of
Cape May County in New Jersey.

.DAY ONE...Through tonight.

Minor coastal flooding is possible.
Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Tuesday. Localized beach erosion
is possible.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ025-182147-
Coastal Atlantic-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for coastal portions of Atlantic
County in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Tuesday. Localized beach erosion
is possible.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ026-182147-
Coastal Ocean-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for coastal portions of Ocean County
in New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Very windy conditions may cause scattered to numerous
instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Monday. Localized beach erosion
is possible.
Life-threatening swimming conditions in the surf zone
and significant beach erosion are expected on Tuesday.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

NJZ027-182147-
Southeastern Burlington-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for southeastern Burlington County in
New Jersey.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.
Windy conditions may cause isolated instances of tree damage and power outages.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Windy conditions may cause isolated instances of tree damage and
power outages on Monday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ012-182147-
Kent MD-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Kent County in Maryland.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ015-182147-
Queen Annes-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Queen Annes County in Maryland.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ019-182147-
Talbot-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Talbot County in Maryland.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

MDZ020-182147-
Caroline-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for Caroline County in Maryland.

.DAY ONE...Through tonight.

Several instances of flooding are possible, especially in urban and
poor-drainage areas and near vulnerable small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Minor coastal flooding is possible on Monday.
Several instances of flooding are possible on Monday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ430-182147-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for upper Delaware Bay.

.DAY ONE...Through tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ431-182147-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for lower Delaware Bay.

.DAY ONE...Through tonight.

Gale-force winds and/or very rough seas are forecast.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ450-182147-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Monmouth County out 20 nm.

.DAY ONE...Through tonight.

Hurricane-force winds and/or dangerously high seas are forecast.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Monday. Localized beach erosion
is possible.
Life-threatening swimming conditions in the surf zone
and significant beach erosion are expected on Tuesday.
Hurricane-force winds and/or dangerously high seas are expected
on Monday.
Gale-force winds and/or very rough seas are forecast on Tuesday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ451-182147-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Ocean County out 20 nm.

.DAY ONE...Through tonight.

Hurricane-force winds and/or dangerously high seas are forecast.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Monday. Localized beach erosion
is possible.
Life-threatening swimming conditions in the surf zone
and significant beach erosion are expected on Tuesday.
Hurricane-force winds and/or dangerously high seas are expected
on Monday.
Gale-force winds and/or very rough seas are forecast on Tuesday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ452-182147-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Atlantic County out 20 nm.

.DAY ONE...Through tonight.

Hurricane-force winds and/or dangerously high seas are forecast.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Tuesday. Localized beach erosion
is possible.
Hurricane-force winds and/or dangerously high seas are expected
on Monday.
Gale-force winds and/or very rough seas are forecast on Tuesday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ453-182147-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Cape May County out 20 nm.

.DAY ONE...Through tonight.

Hurricane-force winds and/or dangerously high seas are forecast.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Large breaking waves are expected to result in dangerous swimming
conditions in the surf zone on Tuesday. Localized beach erosion
is possible.
Hurricane-force winds and/or dangerously high seas are expected
on Monday.
Gale-force winds and/or very rough seas are forecast on Tuesday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ454-182147-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to the mouth of Delaware Bay out 20 nm.

.DAY ONE...Through tonight.

Storm-force winds and/or very high seas are expected.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Storm-force winds and/or very high seas are expected on Monday.
Gale-force winds and/or very rough seas are forecast on Tuesday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ455-182147-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
0447 PM EST Sun Dec 17 2023

This Hazardous Weather Outlook is for the Atlantic coastal waters
adjacent to Sussex County out 20 nm.

.DAY ONE...Through tonight.

Storm-force winds and/or very high seas are expected.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on potential weather hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Storm-force winds and/or very high seas are expected on Monday.
Gale-force winds and/or very rough seas are forecast on Tuesday.

Please go to weather.gov/erh/ghwo?wfo=phi for more information on
potential weather hazards.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flood. Local standard time, as filed.

Flood, New Castle

When
December 17, 10:00 PM EST to December 19, 12:15 AM EST
Where
New Castle County, 1.98 mi S of New Castle to 2.63 mi ESE of Claymont
Cause
Heavy Rain
Reported by
Other Federal Agency
Coordinates
39.642, -75.575

Across southeast Pennsylvania and northern Delaware, flooding occurred on the Brandywine River, the Schuylkill River, the Christina River, Red Clay Creek, and White Clay Creek. The Cooch’s Bridge gauge crested at 12.2 ft. The Langhorne gauge crested at 13.59 ft. The Downingtown gauge crested at 10.94 ft. The Newark gauge crested at 14.45 ft. The Chadd’s Ford gauge crested at 12.18 ft. The Wooddale gauge crested at 8.58 ft. The Graterford gauge crested at 16.30 ft. The Chester gauge crested at 11.87 ft. The Philadelphia gauge crested at 11.82 ft. The Pottstown gauge crested at 13.92. The Norristown gauge crested at 15.85. The Langhorne gauge crested at 13.59 ft. The Wilmington gauge crested at 17.08 ft. All of these crests are above flood stage.

Flooding was reported along old Airport Road close to the Christina River.

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Delaware in 2023Every state in 2023This day in weather historyWarnings in Delaware, December 2023

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1153835.