Delaware, 2023

Dense Fog in Delaware, December 9, 2023

December 9, 2023 · NWS PHI · 2 events in 2 counties and zones

A stagnant and very moist air mass north of a stationary front resulted in widespread dense fog early on December 9th.

Where it happened

Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. 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

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

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 stagnant and very moist air mass north of a stationary front resulted in widespread dense fog early on December 9th.

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 8, 6:40 PM EST, 5 hours 20 minutes earlier.

Area forecast discussion, Dec 8, 6:40 PM EST, 5 hours 20 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
640 PM EST Fri Dec 8 2023

.SYNOPSIS...
The region will feel the influence of surface high pressure to the
south through Saturday. A potent cold front approaches Saturday
night and Sunday. Potent cold front crosses through Sunday night.
High pressure begins to build in Monday and holds a firm grasp over
the region to the end of the week.

&&

.NEAR TERM /THROUGH SATURDAY/...
Forecast running mostly on track. Will make some adjustments to
hourly grids based on latest surface obs.

Otherwise, quiet weather for the near term. One challenge, for
the overnight, will be deciding how much and how dense any fog
will be. Overall, a decent setup for radiational cooling, but a
dry air mass in place. Decided to continue with the patchy fog
wording for the public fcst. Clear to partly cloudy skies
otherwise with lows in the low/mid 30s most spots. Light S/SE
winds.

A great weather day Saturday with mostly sunny skies and mild
temperatures. Highs will reach the low/mid 50s for the areas N/W
of the fall-line and upper 50s/low 60s for Delmarva, metro
Philadelphia and srn NJ. Mostly South winds 5 to 10 mph.

&&

.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/...
Bottom Line...A potent cold front undergoing significant
frontogenesis will cross through the region Sunday night. This
will bring a handful of weather impacts to the region Sunday
into Monday including strong winds, heavy rain, freshwater and
tidal flooding concerns.

Synoptic Pattern...A potent cold front to our west will further
approach Saturday night, and look to cross through during the
Sunday night period. Following passage, high pressure behind the
front will build in Monday as precipitation tapers off.

Saturday night...Winds are forecast to be light for many areas
during the first half of the period. With continued moisture
and warm air advection during this period, it is possible that
fog develops across areas in the region. It is even possible
that some marine fog develops early in the period before
winds/gusts pick up later on. Forecaster confidence in fog
development is low to moderate, so will refrain from discussing
visibilities and density of fog for now. In the second half of
the period, there are slight chances and chances of
precipitation for area.

Sunday...By Sunday morning, the pressure gradient will begin to
increase and therefore, a increase in winds and gusts will be
felt across the region. Precipitation will likely arrive in our
western areas in the morning and will increase in magnitude
while spreading eastward with time. By the afternoon, moderate,
to heavy rain at times, is expected across the region. Winds
will be 15-20 mph sustained with gusts of 30-45 mph possible.
Those higher gusts of 40-45 mph will be felt closer to coastal
areas.

Sunday night...Heaviest of rainfall is expected to drape
eastward with time. Pressure gradient will only increase, with
the entire region looking to see 20-30 mph winds with gusts up
to 35-45 mph.

Monday...Lingering precipitation behind the cold front will linger
some. Our more western areas (primarily Poconos and Sussex
County NJ) may see some snow mixed with rain with the cold
advection; otherwise, rain is expected for all other areas
given the situation. Precipitation chances will taper off with
time. No precipitation is expected by the afternoon. Winds and
gusts will remain the same magnitude from the previous period,
only in the late afternoon/evening will they begin to decrease.

Models indicate mesoscale banding and significant frontogenesis
will occur with the system as well as elevated instability.
Mesoscale guidance will have be watched going forward. 2.0-3.0
inches of rain are expected with locally higher amounts
possible. WPC maintains all of our region in a MARGINAL risk for
excessive rainfall with northern NJ in a SLIGHT risk for
excessive rainfall (see HYDROLOGY section for more details).
Strong winds are expected Sunday through Monday as discussed.
Wind advisories for the coastal areas is a certainty; high wind
watches/warnings are possible for the same areas. High winds
will contribute to growing coastal flooding concerns as well as
proximity of the event to the new moon on December 12th.

&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
Latest ensemble and deterministic model guidance indicates the long
term will be dominated by surface high pressure. Given almost no
divergence among guidance for this situation and the overall
synoptic pattern, forecaster confidence in the forecast is high.

Overall, with surface high pressure in control expect a quiet long
term weather wise. Precipitation during the term is not expected; no
PoPs are included in the forecast. Temperatures will likely run
right around normal through the term.

&&

.AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas...

Tonight...VFR initially, then IFR CIGs/VSBYs will develop in the
pre-dawn hours of Saturday in fog/stratus. LGT/VRB winds.
Moderate confidence.

Saturday...VFR after any fog diminishes. High clouds expected.
South to Southwest winds 5 to 10 knots developing. Medium/high
confid.

Outlook...

Saturday night...Sub-VFR with fog possible. Ceilings will develop
and drop through the period. Chance of -RA. S/SE winds 5-10 knots.
Low confidence.

Sunday...Sub-VFR. RA with RA+ possible at times. S winds increasing
to 15-20 knots with gusts up to 25-30 knots. Moderate confidence.

Sunday night...Sub-VFR. RA/+RA. S winds 20-25 knots with frequent
gusts of 30-40 knots will veer westerly after strong cold frontal
passage. Moderate confidence.

Monday...Sub-VFR ceilings lingering in the morning will give way to
mainly VFR conditions by the afternoon. W/NW winds 20-25 knots with
frequent gusts of 30-40 knots. Moderate confidence.

Tuesday...VFR. W/SW winds around 10 knots. High confidence.

Wednesday...VFR. W winds around 10 knots. High confidence.

&&

.MARINE...
Overall, tranquil weather tonight and Saturday. There could be some
fog towards morning. sub-SCA winds and seas. Winds mostly South to
Southeast around 10 knots.

Outlook...

Saturday night...No marine headlines anticipated.

Sunday...Gales with seas building up to 7-9 feet. Gale Watch is
in effect.

Sunday night...Gales. Storm force winds possible. Seas 8-12
feet. Gale Watch is in effect.

Monday...Gales continue. Storm force winds possible. Seas around 10
feet will diminish with time to 7-9 feet. Gale Watch is in
effect.

Tuesday...SCA criteria possible; seas may linger around 5 feet.

Wednesday...No marine headlines expected.

&&

.HYDROLOGY...
After collaborating with surrounding offices, the MARFC, and WPC,
we've decided to issue a Flood Watch late Sunday and through the day
on Monday. Yes, we're talking about a 5th and 6th period Watch, but
confidence is ramping up that the region will see rainfall between
2 and 3 inches.

Putting things into perspective, this isn't going to be Ida or an
event with vast widespread impacts, but it could still be an event
that causes a variety of flooding types.

Here's how we see it playing out using the current QPF. Poor
drainage, urban, small stream, and even isolated flash flooding will
commence later on Sunday. It's to our benefit that the ground is
nowhere near frozen, but runoff still becomes more efficient this
time of year when everything that grows becomes dormant. Runoff will
make it to the smaller creeks and streams Sunday night and then to
our rivers beginning on Monday. Portions of the mainstem Passaic
might not flood until Tuesday.

The mainstem Delaware is not expected to reach Flood Stage at any
forecast point. As mentioned, a point or two on the Passaic could
flood on Tuesday. The mainstem Raritan is not forecast to flood at
this time, although Action Stage is possible. Current simulations do
not have any of the mainstem Schuylkill flooding, but with more rain
modeled across PA vs. NJ, I would continue to monitor. So outside of
our mainstems, we'll need to watch our forecast points across SE PA,
and points N and W of the mainstem Passaic. Even places like
Minisink Hills and Shoemakers could see good in-bank rises if the
3 inches of rainfall comes to fruition across the southern Poconos.

So with the possibility of poor drainage, urban, small stream,
flash, river flooding, and flooding along the back bays (due to poor
drainage), we decided to issue a Flood Watch for the entire HSA. We
want to get the message out before everyone leaves for the day and
goes home to relax a bit this weekend.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flood Watch from Sunday afternoon through Monday afternoon for
     PAZ054-055-060>062-070-071-101>106.
NJ...Flood Watch from Sunday afternoon through Monday afternoon for
     NJZ001-007>010-012>027.
DE...Flood Watch from Sunday afternoon through Monday afternoon for
     DEZ001>004.
MD...Flood Watch from Sunday afternoon through Monday afternoon for
     MDZ012-015-019-020.
MARINE...Gale Watch from Sunday evening through Monday evening for
     ANZ430-431.
     Gale Watch from Sunday morning through Monday evening for
     ANZ450>455.

&&

SYNOPSIS...Wunderlin
NEAR TERM...MPS/OHara
SHORT TERM...Wunderlin
LONG TERM...Wunderlin
AVIATION...MPS/OHara/RCM/Wunderlin
MARINE...OHara/RCM/Wunderlin
HYDROLOGY...
Hazardous weather outlook, Dec 8, 10:42 PM EST, 1 hour 18 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
1042 PM EST Fri Dec 08 2023

DEZ001-100342-
New Castle-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

Areas of fog, some of which could be dense, are possible.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Widespread dense fog is possible on Saturday.

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.

DEZ002-100342-
Kent-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Kent County in Delaware.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

DEZ003-100342-
Inland Sussex-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

DEZ004-100342-
Delaware Beaches-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

PAZ054-100342-
Carbon-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Carbon County in Pennsylvania.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

PAZ055-100342-
Monroe-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Monroe County in Pennsylvania.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

PAZ060-100342-
Berks-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Berks County in Pennsylvania.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

PAZ061-100342-
Lehigh-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Lehigh County in Pennsylvania.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

PAZ062-100342-
Northampton-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Northampton County in
Pennsylvania.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

PAZ070-100342-
Delaware-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Delaware County in Pennsylvania.

.DAY ONE...Through tonight.

Areas of fog, some of which could be dense, are possible.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Widespread dense fog is possible on Saturday.

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.

PAZ071-100342-
Philadelphia-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Philadelphia County in
Pennsylvania.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

PAZ101-100342-
Western Chester-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

Areas of fog, some of which could be dense, are possible.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

PAZ102-100342-
Eastern Chester-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

Areas of fog, some of which could be dense, are possible.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Widespread dense fog is possible on Saturday.

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.

PAZ103-100342-
Western Montgomery-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

PAZ104-100342-
Eastern Montgomery-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

PAZ105-100342-
Upper Bucks-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

PAZ106-100342-
Lower Bucks-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ001-100342-
Sussex-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ007-100342-
Warren-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ008-100342-
Morris-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ009-100342-
Hunterdon-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ010-100342-
Somerset-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

NJZ012-100342-
Middlesex-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ013-100342-
Western Monmouth-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

NJZ014-100342-
Eastern Monmouth-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

NJZ015-100342-
Mercer-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

NJZ016-100342-
Salem-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

NJZ017-100342-
Gloucester-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

NJZ018-100342-
Camden-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.
Windy conditions may cause isolated instances of tree damage and
power outages on Sunday.

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.

NJZ019-100342-
Northwestern Burlington-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
especially in urban and poor-drainage areas and near particularly vulnerable
small creeks and streams.
Areas of fog, some of which could be dense, are possible on Saturday.

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.

NJZ020-100342-
Ocean-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Minor coastal flooding is possible on Sunday.
Several instances of flooding are possible on Sunday,
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 Sunday.

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.

NJZ021-100342-
Cumberland-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

NJZ022-100342-
Atlantic-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

NJZ023-100342-
Cape May-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

NJZ024-100342-
Atlantic Coastal Cape May-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.
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.

NJZ025-100342-
Coastal Atlantic-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.
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.

NJZ026-100342-
Coastal Ocean-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Minor coastal flooding is possible on Sunday.
Several instances of flooding are possible on Sunday,
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 Sunday.
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.

NJZ027-100342-
Southeastern Burlington-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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 Sunday.

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.

MDZ012-100342-
Kent MD-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Kent County in Maryland.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

MDZ015-100342-
Queen Annes-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

MDZ019-100342-
Talbot-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Talbot County in Maryland.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

MDZ020-100342-
Caroline-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for Caroline County in Maryland.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Several instances of flooding are possible on Sunday,
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.

ANZ430-100342-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for upper Delaware Bay.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ431-100342-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
1042 PM EST Fri Dec 08 2023

This Hazardous Weather Outlook is for lower Delaware Bay.

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ450-100342-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ451-100342-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ452-100342-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ453-100342-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ454-100342-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
1042 PM EST Fri Dec 08 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.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

ANZ455-100342-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
1042 PM EST Fri Dec 08 2023

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

.DAY ONE...Through tonight.

There is a low probability of widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

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

The radar

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

Open the radar archive at this moment

Event by event

2 dense fog. Local standard time, as filed.

Dense Fog, Kent

When
December 9, 12:00 AM EST to 11:00 AM EST
Where
Kent forecast zone
Reported by
AWOS
Coordinates
39.096, -75.505 (the zone’s center; the record gives no point)

Dense fog was observed for several hours at Delaware Airpark.

Dense Fog, New Castle

When
December 9, 12:00 AM EST to 11:00 AM EST
Where
New Castle forecast zone
Reported by
ASOS
Coordinates
39.578, -75.639 (the zone’s center; the record gives no point)

Dense fog was observed for several hours at Wilmington Airport.

What these are

Dense Fog
Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.

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: 1149558, 1149559.