Alert archive / Pennsylvania / Areal Flood Warnings in 2018

Areal Flood Warning 27, NWS Philadelphia/Mount Holly

May 27, 2018Bucks County, Pennsylvania; Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at May 27, 2018, 11:18 AM EDT for Bucks County, Pennsylvania; Mercer County, New Jersey. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 27, 2018, 11:18 AM EDT (15:18 UTC)
Expired
May 27, 2018, 6:15 PM EDT
In force
7 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Mercer County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 15:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 3.3 hours before the alert went out and 259 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2018-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 328 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2018-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
328 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
897 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

514 
WGUS41 KPHI 271518
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1118 AM EDT SUN MAY 27 2018

NJC021-PAC017-271915-
/O.NEW.KPHI.FA.W.0027.180527T1518Z-180527T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-
1118 AM EDT SUN MAY 27 2018

The National Weather Service in Mount Holly NJ has issued a

* Flood Warning for...
  Southern Mercer County in central New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 315 PM EDT.

* At 1113 AM EDT, although Doppler radar indicated the rain was 
  coming to an end, a widespread 1 to 3 inches have already fallen. 
  Runoff from this rain will continue across the warned area into 
  the afternoon. Separate Flood Warnings are also up specifically 
  for the Assunpink Creek in Mercer County and the Neshaminy Creek 
  in Lower Bucks County.  

* Some locations that could experience flooding include...
  Trenton, Ewing, Yardley, Newtown, Tullytown, Langhorne, Washington
  Crossing, Feasterville-Trevose, Windsor, Feasterville, Woodside,
  White Horse, Mercerville-Hamilton Square, Langhorn, Levittown,
  Richboro, Morrisville, Penndel, Langhorne Manor and Hulmeville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4023 7451 4018 7469 4019 7470 4017 7471
      4012 7497 4017 7508 4020 7507 4024 7495
      4031 7490 4029 7486 4027 7470

$$

Kruzdlo
2 follow-up statements
161 
WGUS41 KPHI 271822
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
222 PM EDT SUN MAY 27 2018

NJC021-PAC017-272215-
/O.EXT.KPHI.FA.W.0027.000000T0000Z-180527T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-
222 PM EDT SUN MAY 27 2018

The National Weather Service in Mount Holly NJ has extended the

* Flood Warning for...
  Southern Mercer County in central New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 218 PM EDT, Doppler radar and automated observations indicated 
  that 1 to up to 6 inches of rain have fallen today. The heaviest 
  rain fell across Mercer County. Runoff from this rain will 
  continue across the warned area through the afternoon. Separate 
  Flood Warnings are also up specifically for the Assunpink Creek in 
  Mercer County and the Neshaminy Creek in Lower Bucks County.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4023 7451 4018 7469 4019 7470 4017 7471
      4012 7497 4017 7508 4020 7507 4024 7495
      4031 7490 4029 7486 4027 7470

$$

Kruzdlo
733 
WGUS81 KPHI 272211
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
611 PM EDT SUN MAY 27 2018

NJC021-PAC017-272219-
/O.EXP.KPHI.FA.W.0027.000000T0000Z-180527T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-
611 PM EDT SUN MAY 27 2018

...THE FLOOD WARNING WILL EXPIRE AT 615 PM EDT FOR SOUTHERN MERCER
AND SOUTHEASTERN BUCKS COUNTIES...

This Flood Warning has been modified and re-issued. Please refer to 
the Flood Warning issued at 6:07 pm for the latest details.

LAT...LON 4023 7451 4018 7469 4019 7470 4017 7471
      4012 7497 4017 7508 4020 7507 4024 7495
      4031 7490 4029 7486 4027 7470

$$

MPS

What forecasters said that day

The local office's own words before this areal flood warning went out, 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 this areal flood warning went out at May 27, 10:32 AM EDT, 46 minutes earlier.

Area forecast discussion, May 27, 10:32 AM EDT, 46 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
1032 AM EDT Sun May 27 2018

.SYNOPSIS...
High pressure remains anchored well off the Southeast U.S. coast
through the weekend. A back door cold front will slowly move
south across the region through today and will become nearly
stationary over the Mid-Atlantic and stretching back to the
south and west for the start of the new week. Several waves of
low pressure will impact the region through Monday. Another cold
front moves through the region on Tuesday. Weak high pressure
briefly builds in from the north on Wednesday, and then the
stationary boundary lifts north as a warm front late in the
week. Moisture from the remnants of Subtropical Storm Alberto
may affect the area late in the new week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Showers and occasional thunderstorms continue to move southward
this morning along and just behind a back door front which has
moved into southern NJ and far northern DE. This activity should
continue to diminish into the early afternoon, as the front
continues southward and mid-level shortwave energy moves away,
and this trend is already underway in terms of decreasing rain-
fall rates.

The backdoor front should slow across Delmarva, as additional
short wave energy moves in from the west. This is expected to
initiate development of showers and thunderstorms this afternoon
over portions of southeastern PA and the eastern shore of MD,
and this activity will move slowly eastward. The front is
already becoming parallel to the mid-level flow this morning,
and the arrival of the shortwave will aid large scale lift of
an anomalously moist tropical air mass (Precipitable Water
values around 2.0 inches ~ 2 to 3 Standard Deviations above
normal), with slow cell movement/training expected to lead to
excessive rainfall rates this afternoon into tonight across
far southeastern PA, far southern NJ, the eastern shore of
MD, and Delaware. The majority of the guidance, particularly
the higher resolution models that did a good job with the
earlier event this morning across portions of PA and NJ are
strongly keying in on the potential for excessive rainfall
rates in a short period of time across this area, i.e., 3
inches within a few hours. In addition, there has been good
model consistency since yesterday, pointing to this potential.
Finally, the ground is still somewhat saturated from prior
rainfall, which is evident in Flash Flood Guidance.

After collaboration with surrounding offices, all of the above
increases forecaster confidence. Therefore, a Flash Flood
Watch has been issued for far southeastern PA, far southern NJ,
the eastern shore of MD, and Delaware through 4 AM Monday
Morning.

Otherwise, updated the forecast to account for temperature,
dew point, and wind trends, as the back door front moves
southward across the region.

Previous Discussion...
Complex Scenario evolving early this morning. In the upper
levels, shortwave energy associated with the main branch of the
jet stream is approaching from the west. Meanwhile, a deep feed
of tropical moisture continues to advect from the Gulf around a
broad high over the western Atlantic right into the area. At the
surface, an area of convergence is setting up across the
forecast area as the warm, humid S/SW flow is coming up against
a backdoor cold front beginning to enter the CWA from the N/NE.
Still a decent amount of instability around as well with the
northern edge of the instability over eastern PA into northern
NJ. The upshot of all this is that showers and storms have
started to become more widespread across the forecast area and
this trend should continue as we head into early this morning.
High res models continue to suggest that this convection may
tend to focus near the I-78 corridor for a time as the front
moves southward toward this area. Given that PWATs are near 2
inches and the impressive rain rates we've already seen with
some of these showers, very heavy rain will be possible and this
could produce rain amounts of 2-3+ inches within a few hours if
training sets up with storms repeatedly tracking over the same
area. As such, Flash Flood Watch for a large swath of the CWA
remains in effect until 14z...basically including all areas
except the far northern Counties, the Delmarva, and extreme
southern NJ. General trend over the next 6 to 12 hours should be
for the heavy rain threat to move south with the front

Previous Discussion...
Heading through Sunday morning, the aformentioned backdoor cold
front will slowly move southward, likely reaching as far as the
greater Philadelphia area by mid morning before stalling across
the Delmarva this afternoon. As this occurs, best chances for
widespread heavy showers and storms will move southward in
tandem with the front. That said, there may be a lull in
shower/storm activity for a time later this morning before
showers/storms regenerate in the afternoon as the next shortwave
approaches...likely most widespread and heaviest over SE PA far
southern NJ and the Delmarva by this time since this is where
the front will be stalling out. Very heavy rain with an
associated urban, small stream, and flash flood risk will
continue but will hold off on any extension in space or time to
the Flash Flood Watch to get better confidence on where exactly
the highest threat will be.

Tricky temperature forecast for today...clouds, showers will
limit temps from getting as hot as Saturday along with the
passage of the front. However main challenge will be just how
quickly low level cooler air behind the front is advected south
and whether weak heating and associated mixing will be able to
act much on the cooler airmass. Fairly widespread differences in
model guidance regarding temps but based on past performance in
these types of cases leaned a little more toward the cooler
guidance. As such, once the front goes by generally expect temps
to hover in the 60s to low 70s across central and northern
parts of the CWA. Meanwhile from around Philly south, generally
expect highs in the mid 70s to low 80s over the Delmarva.
However by this afternoon, temps around Philly will likely be
falling through the low 70s into the 60s by evening as the
cooler air advects south in earnest.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM MONDAY/...
Showers and storms, possibly quite heavy, will be ongoing this
evening, especially from around the Mason-Dixon line south
across the Delmarva near the front. The associated flood threat
discussed above will continue. In fact, shower/storms may be
ongoing across this area for a good part of the evening into the
overnight before the upper trough helping to drive them passes
off to the east overnight. In its wake, weak surface ridging
with the cooler airmass behind the front looks to try to take
hold over the area but with abundant low level moisture
lingering low stratus along with areas of mist and drizzle can
be expected. Lows by morning will drop into the mid 50s across
the far north through the southern Poconos into NW NJ with lows
generally in the upper 50s to mid 60s elsewhere, warmest across
the Delmarva.

Heading into Memorial Day, weak ridge should continue to persist
over the area with the front sitting off to the south. It's
possible a few spotty showers could drift north into the area
but otherwise the day should be mainly dry. However expect
abundant moisture to remain trapped below a low level inversion
so this should keep skies mainly cloudy through the day and keep
highs from getting above the 70s. It will still be fairly muggy
with high dew points over the Delmarva but not too bad farther
north.

&&

.LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
High pressure passes to the north on Tuesday, and then a back-
door cold front moves through the region late in the day. Ahead
of that boundary, though, a warm and humid airmass will be in
place. Highs top off in the mid and upper 80s with surface
dewpoints well in the 60s. Scattered convection looks to develop
over central PA and may move into southeast PA, western NJ, and
the Delmarva. Will follow guidance and cap PoPs at slight
chance. The moisture and the instability will be there for
convection over the area, it just remains to be seen if there is
enough of a trigger for storms to develop.

During this time, what is currently Subtropical Storm Alberto over
the eastern Gulf of Mexico will lift north and affect the eastern
Gulf Coast states. By Wednesday, the remnant low of this storm will
lift into the Midwest. This also pushes that stationary front north
as a warm front. High pressure over the Northeast moves offshore by
Wednesday night, and then that warm front will move into the
Delmarva and Delaware Valley.

Unsettled weather then possible for the end of the week and start of
the weekend as the remnant low of Alberto meanders over the
Northeast and Mid-Atlantic. Best chances for precip will be Thursday
through Friday. Given high levels of uncertainty, will generally run
with chance PoPs for next weekend. However, given that this low will
arrive as a warm and tropical airmass will be over the area with
dewpoints well in the 60s, there is the threat for heavy rain and
flooding during this time.

&&

.AVIATION /14Z SUNDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Today...Cigs lower into this morning with low MVFR generally
expected to predominate at at all sites by mid morning. There
will likely be fluctuations in cigs as the area will be affected
by on and off showers with the risk of storms through the day.
Periods of IFR will be possible, especially this morning, with
cigs possibly improving briefly this afternoon. Winds will shift
to E/NE this morning behind a backdoor front at generally
around 5-10 knots with a few higher gusts possible.

Tonight...IFR/LIFR CIGs as marine airmass overspreads the
region. Showers and thunderstorms may continue through the
evening, especially from PHL southward, before tapering off by
the overnight with areas mist/drizzle likely developing. NE
winds less than 10 kt.

Outlook...

Monday...Lingering IFR CIGs and showers in the morning. MVFR
CIGs in the afternoon. NE winds less than 10 kt become SE late.

Tuesday...Mostly VFR. Potential for afternoon SHRA/TSRA. W-NW
winds less than 10 kt.

Wednesday...Mostly VFR. Light East winds become SE 10-15 kt.
Stronger winds possible at KACY. Potential for SHRA/TSRA late in
the day and SHRA at night.

Thursday...SHRA/TSRA possible throughout the day. S winds 10-15
kt.

&&

.MARINE...
Today...A backdoor front will progress southward across the
coastal waters. Winds will shift from southwest to northeast
along with the frontal passage. The strongest northeast winds
are expected across the northern coastal waters of NJ
(ANZ450-51), where gusts to 25 kt are most likely to occur.
Seas in the ANZ450-51 may build to 5 ft in response to the
strengthening onshore flow. An SCA has been issued in
accordance with the frontal passage timing, as northeast winds
will rapidly increase behind the front, as follows: ANZ450 at
10Z and ANZ451 at 13Z.

Tonight...Any lingering SCA wind gusts will diminish in the
evening. NE winds 10-15 kt. Ocean seas 2-4 feet, and waves on DE
Bay 2 feet or less. VSBY restrictions in fog possible.

Outlook...

Monday through Thursday...Winds and seas below SCA levels.

Rip Currents...

A back door cold moving southward across the area today and
cause winds to shift from the south-southwest to the northeast.
While swell periods are expected to range from 5 to 7 seconds,
an onshore flow will develop along the NJ oceanfront during the
day, with wind gusts up to 20-30 mph. This will build waves in
the surf zone up to 3-5 feet. In particular, the rip current
risk will be greatest for the Monmouth and Ocean County beaches,
where the winds will be strongest (25-30 mph), waves in the
surf zone will be highest (4-5 ft), and where a northeast flow
yields more of an onshore component due to the orientation of
the coastline.

In terms of the risk for the development of dangerous rip
currents: a solid moderate risk of rip currents for the NJ
beaches, perhaps approaching high in Monmouth and Ocean County
counties. Further south, a low risk for the Delaware beaches.

Remember, a low risk of rip currents does not mean no risk!
Life threatening rip currents often still occur near jetties,
reefs, and piers. The vast majority of rip current victims swam
at unguarded beaches. ALWAYS SWIM IN THE PRESENCE OF A
LIFEGUARD.

Today will certainly not be a 'beach day' given cloudy skies
and the chance of showers, with cooler than average temperatures
in the mid-60s to mid-70s, along with northeast wind gusts
20-30 mph.

&&

.TIDES/COASTAL FLOODING...
The latest Total Water Level forecast issued early this morning
indicates spotty minor tidal flooding with this evenings's high tide
along the NJ and DE oceanfront and Delaware Bay, and with the
overnight high tide along the tidal portion of the lower Delaware
River. We currently do not anticipate issuance of Coastal Flood
Advisories but it will be closely monitored today (particularly with
how positive tidal anomalies grow in response to the northeasterly
wind surge this afternoon).

For the upper Delaware Bay and tidal Delaware River, there is a
potential for spotty minor tidal flooding again with the Monday
night high tide cycle though confidence in this happening is low at
this point.

&&

.EQUIPMENT...
The Sandy Hook NOS tide gauge (SDHN4) remains out of service.
CORMS is addressing the problem. There is currently no estimated
time for a return to service.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flash Flood Watch through late tonight for PAZ070-101-102.
NJ...Flash Flood Watch through late tonight for NJZ016-017-021>024.
DE...Flash Flood Watch through late tonight for DEZ001>004.
MD...Flash Flood Watch through late tonight for MDZ008-012-015-019-
     020.
MARINE...Small Craft Advisory until midnight EDT tonight for ANZ450-451.

&&

Synopsis...Fitzsimmons/LF
Near Term...Fitzsimmons
Short Term...Fitzsimmons
Long Term...MPS
Aviation...Fitzsimmons/LF/Robertson/MPS
Marine...Fitzsimmons/LF/MPS
Tides/Coastal Flooding...
Equipment...
Hazardous weather outlook, May 27, 10:38 AM EDT, 40 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
1038 AM EDT Sun May 27 2018

NJZ001-007>010-012-013-015-018>020-027-PAZ054-055-060>062-071-
103>106-281445-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Mercer-Camden-Northwestern Burlington-Ocean-Southeastern Burlington-
Carbon-Monroe-Berks-Lehigh-Northampton-Philadelphia-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
1038 AM EDT Sun May 27 2018

This Hazardous Weather Outlook is for central New Jersey, northern
New Jersey, northwest New Jersey, southern New Jersey, east central
Pennsylvania, northeast Pennsylvania and southeast Pennsylvania.

.DAY ONE...Today and 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.

DEZ001>004-MDZ008-012-015-019-020-NJZ016-017-021>023-PAZ070-101-102-
281445-
New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-
Queen Annes-Talbot-Caroline-Salem-Gloucester-Cumberland-Atlantic-
Cape May-Delaware-Western Chester-Eastern Chester-
1038 AM EDT Sun May 27 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for central Delaware, northern
Delaware, southern Delaware, northeast Maryland, southern New
Jersey and southeast Pennsylvania.

.DAY ONE...Today and Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

Several rounds of showers and thunderstorms will affect the area
today through tonight. The main threat is the potential for
torrential downpours which may lead to localized poor drainage and
small stream flooding. Localized flash flooding will also be
possible, especially late this afternoon into tonight. Additionally,
there is the potential for some storms to produce strong wind gusts.

.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.

NJZ014-026-281445-
Eastern Monmouth-Coastal Ocean-
1038 AM EDT Sun May 27 2018

This Hazardous Weather Outlook is for central New Jersey and
southern New Jersey.

.DAY ONE...Today and Tonight.

There is a moderate risk of rip currents today.

.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.

NJZ024-281445-
Atlantic Coastal Cape May-
1038 AM EDT Sun May 27 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

This Hazardous Weather Outlook is for southern New Jersey.

.DAY ONE...Today and Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flash Flood Watch.

Several rounds of showers and thunderstorms will affect the area
today through tonight. The main threat is the potential for
torrential downpours which may lead to localized poor drainage and
small stream flooding. Localized flash flooding will also be
possible, especially late this afternoon into tonight. Additionally,
there is the potential for some storms to produce strong wind gusts.

There is a moderate risk of rip currents today.

.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.

NJZ025-281445-
Coastal Atlantic-
1038 AM EDT Sun May 27 2018

This Hazardous Weather Outlook is for southern New Jersey.

.DAY ONE...Today and Tonight.

There is a moderate risk of rip currents on Sunday.

.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.

ANZ430-431-450>455-281445-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
1038 AM EDT Sun May 27 2018

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...Today and Tonight.

Thunderstorms today could produce frequent lightning, locally strong
winds and higher seas.

.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.

In the hours before

Local storm report, May 27, 10:54 AM EDT, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1054 AM EDT SUN MAY 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1011 AM     FLOOD            PRINCETON               40.35N  74.66W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            RISING WATER ALONG RIVER ROAD. DEBRIS ALONG ROAD EDGE.
            ROAD CLOSURE EXPECTED.

&&

EVENT NUMBER PHI1800905

MPS
Local storm report, May 27, 10:58 AM EDT, 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1058 AM EDT SUN MAY 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1055 AM     FLOOD            LAWRENCE TWP            40.29N  74.73W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            PRINCETON PIKE CLOSED BETWEEN FACKLER ROAD AND
            LEWISVILLE ROAD DUE TO FLOODING.

&&

EVENT NUMBER PHI1800906

MPS
Local storm report, May 27, 10:59 AM EDT, 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1059 AM EDT SUN MAY 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1055 AM     FLOOD            LAWRENCE TWP            40.29N  74.73W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            PRINCETON PIKE CLOSED BETWEEN GRAF AVENUE AND FAIRFIELD
            AVENUE DUE TO HEAVY FLOODING.

&&

EVENT NUMBER PHI1800907

MPS
Local storm report, May 27, 11:03 AM EDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1103 AM EDT SUN MAY 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1053 AM     FLOOD            HOPEWELL TWP            40.35N  74.78W
05/27/2018                   MERCER             NJ   DEPT OF HIGHWAYS

            NJ 29 CLOSED IN BOTH DIRECTIONS DUE TO FLOODING AT
            PLEASANT VALLEY RD. ALL LANES CLOSED.

&&

EVENT NUMBER PHI1800908

MPS
Local storm report, May 27, 11:07 AM EDT, 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1107 AM EDT SUN MAY 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 AM     FLOOD            PENNSAUKEN              39.96N  75.06W
05/27/2018                   CAMDEN             NJ   BROADCAST MEDIA

            THE RAMP TO US RTE 130 NB IN NJ COMING OFF BETSY ROSS
            BRIDGE IS CLOSED DUE TO FLOODING.

&&

EVENT NUMBER PHI1800909

MPS
Local storm report, May 27, 11:13 AM EDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1113 AM EDT SUN MAY 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0510 AM     FLOOD            1 WSW BELMAR            40.17N  74.05W
05/27/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            RT 35 CLOSED IN BOTH DIRECTIONS JUST SOUTH OF NJ-138
            DUE TO FLOODING

0540 AM     HEAVY RAIN       2 S WALL TWP            40.14N  74.08W
05/27/2018  M4.24 INCH       MONMOUTH           NJ   MESONET

            RAINFALL TOTAL IN THE PAST 4-HR

0545 AM     FLOOD            3 ENE GREENBROOK TWP    40.63N  74.44W
05/27/2018                   SOMERSET           NJ   DEPT OF HIGHWAYS

            US-22 CLOSED NEAR CR-531 DUE TO FLOODING

0640 AM     HEAVY RAIN       1 SW SOLEBURY TWP       40.36N  75.02W
05/27/2018  M3.63 INCH       BUCKS              PA   MESONET

            3.5 INCHES OF RAINFALL IN THE PAST HOUR

0654 AM     HEAVY RAIN       DOYLESTOWN AIRPORT      40.33N  75.12W
05/27/2018  M3.75 INCH       BUCKS              PA   ASOS

            RAINFALL OCCURRED OVER AN 80 MIN-PERIOD

0700 AM     FLOOD            FREEHOLD                40.26N  74.28W
05/27/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 33 BETWEEN US 9 AND CR 537/W. MAIN ST.
            ONE LANE MAY BE BLOCKED. TIME ESTIMATED FROM RADAR.

0700 AM     FLOOD            FREEHOLD                40.26N  74.28W
05/27/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 79 IN BOTH DIRECTIONS NEAR CR 537/MAIN
            ST. ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.

0700 AM     FLOOD            EAST AMWELL TWP         40.45N  74.81W
05/27/2018                   HUNTERDON          NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 31 IN BOTH DIRECTIONS AT CR 579. 1 LANE
            CLOSED. TIME ESTIMATED BASED ON RADAR.

0710 AM     FLOOD            MONROE TWP              40.32N  74.43W
05/27/2018                   MIDDLESEX          NJ   LAW ENFORCEMENT

            SHERIFF'S OFFICE REPORTS FLOODING IN MONROE AND NEARBY
            CRANBERRY TWP. REPORTS AROUND 7:10 AM.

0718 AM     FLOOD            EAST WINDSOR TWP        40.25N  74.52W
05/27/2018                   MERCER             NJ   BROADCAST MEDIA

            FLOODING ON 80 ONE MILE ROAD EXTENSTION IN EAST
            WINDSOR, NJ. ROUTE 130 IS BEING CLOSED IN BOTH
            DIRECTIONS AT DUTCH NECK RD AND ROUTE 571.

0730 AM     FLOOD            DOYLESTOWN              40.31N  75.13W
05/27/2018                   BUCKS              PA   911 CALL CENTER

            SOME FLOODED ROADWAYS THROUGHOUT TOWN.

0730 AM     FLOOD            NORTH BRUNSWICK         40.45N  74.48W
05/27/2018                   MIDDLESEX          NJ   DEPT OF HIGHWAYS

            US 1 SB RAMP CLOSED DUE TO FLOODING AT RYDERS LANE.

0730 AM     FLOOD            NEW BRUNSWICK           40.48N  74.44W
05/27/2018                   MIDDLESEX          NJ   DEPT OF HIGHWAYS

            FLOODING ON US 1 SB SOUTH OF NJ 18. RAMP CLOSED. TIME
            ESTIMATED FROM RADAR.

0730 AM     FLOOD            COLLINGWOOD PARK        40.22N  74.13W
05/27/2018                   MONMOUTH           NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 33 IN BOTH DIRECTIONS NEAR COLLINGSWOOD
            CIRCLE. ALL LANES CLOSED. TIME ESTIMATED FROM RADAR.

0800 AM     HEAVY RAIN       2 N MERCERVILLE-HAMILTO 40.26N  74.67W
05/27/2018  M5.54 INCH       MERCER             NJ   MESONET

            RAINFALL IN THE PAST THREE HOURS

0800 AM     HEAVY RAIN       3 E WEST AMWELL TWP     40.37N  74.84W
05/27/2018  M5.04 INCH       MERCER             NJ   MESONET

            RAINFALL OCCURRED IN THE PAST 2.5 HR

0800 AM     HEAVY RAIN       2 N MERCERVILLE-HAMILTO 40.26N  74.67W
05/27/2018  M6.00 INCH       MERCER             NJ   MESONET

0800 AM     HEAVY RAIN       LANGHORNE               40.18N  74.92W
05/27/2018  M3.30 INCH       BUCKS              PA   COCORAHS

            BETWEEN 5:00 AND 8:00 AM. ABOUT 2.1 INCHES BETWEEN 7:00
            AND 8:00 AM.

0804 AM     FLASH FLOOD      TRENTON                 40.22N  74.76W
05/27/2018                   MERCER             NJ   911 CALL CENTER

            ONGOING WATER RESCUES IN MERCER CO. FURTHER INFORMATION
            NOT AVAILABLE AT THIS TIME. MORE INFO WILL BE PROVIDED
            LATER.

0820 AM     HEAVY RAIN       KENDALL PARK            40.41N  74.56W
05/27/2018  M3.13 INCH       MIDDLESEX          NJ   TRAINED SPOTTER

0820 AM     HEAVY RAIN       HOWELL                  40.19N  74.20W
05/27/2018  M2.37 INCH       MONMOUTH           NJ   TRAINED SPOTTER

            2.37" IN SOUTH HOWELL, NJ

0826 AM     HEAVY RAIN       SKILLMAN                40.42N  74.72W
05/27/2018  M2.20 INCH       SOMERSET           NJ   TRAINED SPOTTER

            1.64" IN 1 HOUR FROM 5:50 AM-6:50 AM.

0829 AM     HEAVY RAIN       MERCERVILLE             40.24N  74.69W
05/27/2018  M3.69 INCH       MERCER             NJ   TRAINED SPOTTER

0829 AM     HEAVY RAIN       LAWRENCEVILLE           40.30N  74.73W
05/27/2018  M2.29 INCH       MERCER             NJ   TRAINED SPOTTER

0829 AM     HEAVY RAIN       EWING                   40.27N  74.80W
05/27/2018  M2.18 INCH       MERCER             NJ   TRAINED SPOTTER

0829 AM     HEAVY RAIN       PRINCETON               40.35N  74.66W
05/27/2018  M2.41 INCH       MERCER             NJ   TRAINED SPOTTER

0829 AM     HEAVY RAIN       HOPEWELL                40.39N  74.76W
05/27/2018  M3.16 INCH       MERCER             NJ   TRAINED SPOTTER

0845 AM     HEAVY RAIN       EAST WINDSOR TWP        40.25N  74.52W
05/27/2018  M6.00 INCH       MERCER             NJ   TRAINED SPOTTER

            AS OF 8:45 AM. MANY ROADS IMPASSABLE DUE TO HIGH WATER.

0945 AM     FLOOD            POINT PLEASANT BEACH    40.09N  74.05W
05/27/2018                   OCEAN              NJ   DEPT OF HIGHWAYS

            FLOODING ON NJ 35 SB RAMP TO NJ 88. RAMP CLOSURE.

0950 AM     FLOOD            SOUTH BRUNSWICK         40.40N  74.54W
05/27/2018                   MIDDLESEX          NJ   DEPT OF HIGHWAYS

            FLOODING ON US 1 IN BOTH DIRECTIONS AT RAYMOND RD. 1
            LANE CLOSED.

0954 AM     FLOOD            ROBBINSVILLE            40.21N  74.62W
05/27/2018                   MERCER             NJ   DEPT OF HIGHWAYS

            FLOODING ON US 130 SB AT CHURCH RD. RIGHT LANE CLOSED.

0955 AM     HEAVY RAIN       ROBINSVILLE             40.21N  74.48W
05/27/2018  M4.63 INCH       MONMOUTH           NJ   SOCIAL MEDIA

1011 AM     FLOOD            PRINCETON               40.35N  74.66W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            QUAKER ROAD CLOSED BETWEEN NASSAU PARK AND MERCER ROAD.

1011 AM     FLOOD            PRINCETON               40.35N  74.66W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            MERCER ROAD BETWEEN PROVINCELINE AND HUTCHINSON DRIVE
            IS FLOODING. ROAD CLOSURE EXPECTED.

1011 AM     FLOOD            PRINCETON               40.35N  74.66W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            RISING WATER ALONG RIVER ROAD. DEBRIS ALONG ROAD EDGE.
            ROAD CLOSURE EXPECTED.

1015 AM     HEAVY RAIN       TINTON FALLS            40.27N  74.09W
05/27/2018  M4.36 INCH       MONMOUTH           NJ   TRAINED SPOTTER

1053 AM     FLOOD            HOPEWELL TWP            40.35N  74.78W
05/27/2018                   MERCER             NJ   DEPT OF HIGHWAYS

            NJ 29 CLOSED IN BOTH DIRECTIONS DUE TO FLOODING AT
            PLEASANT VALLEY RD. ALL LANES CLOSED.

1055 AM     FLOOD            LAWRENCE TWP            40.29N  74.73W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            PRINCETON PIKE CLOSED BETWEEN FACKLER ROAD AND
            LEWISVILLE ROAD DUE TO FLOODING.

1055 AM     FLOOD            LAWRENCE TWP            40.29N  74.73W
05/27/2018                   MERCER             NJ   LAW ENFORCEMENT

            PRINCETON PIKE CLOSED BETWEEN GRAF AVENUE AND FAIRFIELD
            AVENUE DUE TO HEAVY FLOODING.

1100 AM     FLOOD            PENNSAUKEN              39.96N  75.06W
05/27/2018                   CAMDEN             NJ   BROADCAST MEDIA

            THE RAMP TO US RTE 130 NB IN NJ COMING OFF BETSY ROSS
            BRIDGE IS CLOSED DUE TO FLOODING.

&&

EVENT NUMBER PHI1800869 PHI1800870 PHI1800871 PHI1800872 PHI1800873
PHI1800875 PHI1800876 PHI1800885 PHI1800877 PHI1800874 PHI1800880
PHI1800889 PHI1800891 PHI1800894 PHI1800878 PHI1800881 PHI1800886
PHI1800896 PHI1800879 PHI1800883 PHI1800884 PHI1800882 PHI1800887
PHI1800888 PHI1800890 PHI1800892 PHI1800893 PHI1800895 PHI1800899
PHI1800898 PHI1800897 PHI1800902 PHI1800903 PHI1800904 PHI1800905
PHI1800901 PHI1800908 PHI1800906 PHI1800907 PHI1800909

MPS

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 11:38 PM EDTFlash Flood WatchPHIBerks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more23 hr
May 27, 6:33 AM EDTFlash Flood WarningPHIBucks4 hr
May 27, 7:30 AM EDTFlash Flood WarningPHIBucks4 hr
May 27, 8:01 AM EDTFlash Flood WarningPHIBucks, Chester, Montgomery4 hr
May 27, 9:17 AM EDTAreal Flood AdvisoryPHIBucks3 hr
May 27, 9:21 AM EDTRiver Flood WarningPHIBucks12 hr
May 27, 9:22 AM EDTAreal Flood AdvisoryPHIPhiladelphia2 hr
May 27, 9:39 AM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery2 hr
May 27, 10:27 AM EDTAreal Flood WarningPHIBucks8 hr
May 27, 3:22 PM EDTCoastal Flood AdvisoryPHIBucks, Delaware, Philadelphia12 hr
May 27, 6:07 PM EDTAreal Flood WarningPHIBucks4 hr
May 27, 1:27 AM EDTSpecial Marine WarningPHI2 hr
May 27, 1:46 AM EDTSpecial Marine WarningPHI89 min
May 27, 1:58 AM EDTAreal Flood AdvisoryPHIMonmouth4 hr
May 27, 2:13 AM EDTAreal Flood AdvisoryPHIMorris, Warren4 hr
May 27, 4:13 AM EDTAreal Flood AdvisoryPHIMiddlesex, Somerset4 hr
May 27, 4:28 AM EDTFlash Flood WarningPHIMonmouth4 hr
May 27, 4:39 AM EDTFlash Flood WarningPHIMiddlesex, Somerset4 hr
May 27, 5:27 AM EDTAreal Flood AdvisoryPHIHunterdon4 hr
May 27, 5:35 AM EDTAreal Flood AdvisoryPHIMercer, Middlesex, Monmouth4 hr
May 27, 5:43 AM EDTFlash Flood WarningPHIMonmouth4 hr
May 27, 6:12 AM EDTFlash Flood WarningPHIMercer, Middlesex, Somerset4 hr
May 27, 8:25 AM EDTAreal Flood WarningPHIMonmouth7 hr
May 27, 8:40 AM EDTAreal Flood WarningPHIMiddlesex, Somerset4 hr
May 27, 9:05 AM EDTRiver Flood WarningPHIMercer13 hr
May 27, 10:02 AM EDTAreal Flood WarningPHIMonmouth6 hr
May 27, 10:19 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Middlesex, Somerset8 hr
May 27, 3:10 PM EDTRiver Flood WarningPHISomerset46 hr
May 27, 3:44 PM EDTAreal Flood WarningPHIMonmouth16 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2018Areal Flood Warnings in New Jersey, 2018Every areal flood warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.