Alert archive / New Jersey / Areal Flood Warnings in 2020

Areal Flood Warning 27, NWS Philadelphia/Mount Holly

August 4, 20205 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 4, 2020, 2:47 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 9 hr. 37 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 4, 2020, 2:47 PM EDT (18:47 UTC)
Expired
Aug 4, 2020, 11:45 PM EDT
In force
9 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Warren County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 18:47 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.

What was reported inside it

TimeReportWhereRemark
Aug 4, 2:53 PM EDTHEAVY RAIN 2.151 Nw Ewing, NJASOS STATION KTTN TRENTON.
Aug 4, 2:54 PM EDTHEAVY RAIN 4.342 Nne Doylestown, PAASOS STATION KDYL DOYLESTOWN.
Aug 4, 2:58 PM EDTHEAVY RAIN 3.253 Se Sand Brook, NJMESONET STATION FW1999 RINGOES.
Aug 4, 3:00 PM EDTHEAVY RAIN 2.121 Wsw Branchburg Twp, NJMESONET STATION FW4161 BRANCHBURG.
Aug 4, 3:00 PM EDTHEAVY RAIN 2.231 Se Upper Makefield Tw, PAMESONET STATION EW4814 NEWTOWN.
Aug 4, 3:00 PM EDTHEAVY RAIN 2.7Somerville, NJMESONET STATION SMVN4 SOMERVILLE.
Aug 4, 3:00 PM EDTHEAVY RAIN 2.941 Ene Skillman, NJMESONET STATION EW0478 SKILLMAN.
Aug 4, 3:01 PM EDTHEAVY RAIN 22 W Princeton, NJMESONET STATION FW0303 PRINCETON.
Aug 4, 3:01 PM EDTHEAVY RAIN 2.061 Nw Newtown Twp, PAMESONET STATION FW0776 NEWTOWN.
Aug 4, 3:01 PM EDTHEAVY RAIN 3.471 Sw Furlong, PAMESONET STATION DW7780 FURLONG.
Aug 4, 3:02 PM EDTHEAVY RAIN 2.293 Se Hopewell, NJMESONET STATION EW7502 PRINCETON.
Aug 4, 3:05 PM EDTHEAVY RAIN 2.171 Ene High Bridge, NJMESONET STATION EW0761 HIGH BRIDGE.
Aug 4, 3:05 PM EDTHEAVY RAIN 3.772 Ene Somerville, NJMESONET STATION FW7617 BRIDGEWATER.
Aug 4, 3:05 PM EDTHEAVY RAIN 7.431 Nnw Perkasie, PAMESONET STATION FW3600 SELLERSVILLE.
Aug 4, 3:07 PM EDTHEAVY RAIN 2.083 Nw Bridgewater, NJASOS STATION KSMQ SOMERVILLE.
Aug 4, 3:09 PM EDTHEAVY RAIN 3.692 Nne Califon, NJMESONET STATION DW2180 CALIFON.
Aug 4, 3:10 PM EDTHEAVY RAIN 2.212 Sse Readington, NJMESONET STATION CW6872 BRANCHBURG.
Aug 4, 3:10 PM EDTHEAVY RAIN 2.582 Ssw Lebanon Twp, NJMESONET STATION 1995D 1 SSW LEBANON TWP.
Aug 4, 3:10 PM EDTHEAVY RAIN 2.87Somerville, NJMESONET STATION FW6261 SOMERVILLE.
Aug 4, 3:10 PM EDTHEAVY RAIN 3.42 Nnw Califon, NJMESONET STATION CALN4 CALIFON.
Aug 4, 3:10 PM EDTHEAVY RAIN 3.512 Wsw Holland Twp, NJMESONET STATION EW7207 MILFORD.
Aug 4, 3:10 PM EDTHEAVY RAIN 3.522 N Milford, NJMESONET STATION FW7136 MILFORD.
Aug 4, 3:10 PM EDTHEAVY RAIN 4.181 Sw Swinesburg, NJMESONET STATION FW7173 BLOOMSBURY.
Aug 4, 3:11 PM EDTHEAVY RAIN 4.411 Nw Kintnersville, PAMESONET STATION DW7738 KINTNERSVILLE.
Aug 4, 3:12 PM EDTHEAVY RAIN 2.394 Ese Sand Brook, NJMESONET STATION EW4162 RINGOES.
Aug 4, 3:13 PM EDTHEAVY RAIN 2.47Lambertville, NJMESONET STATION FW2229 LAMBERTVILLE.
Aug 4, 3:14 PM EDTHEAVY RAIN 2.171 Se Newtown, PAMESONET STATION NWTOW NEWTOWN (GEORGE).
Aug 4, 3:14 PM EDTHEAVY RAIN 2.482 Wsw Jamison, PAMESONET STATION CW1708 WARRINGTON.
Aug 4, 3:14 PM EDTHEAVY RAIN 2.651 Ene Holland Twp, NJMESONET STATION MLFHT MILFORD NW.
Aug 4, 3:14 PM EDTHEAVY RAIN 5.942 Wsw Haycock Twp, PAMESONET STATION FW2625 QUAKERTOWN.
Aug 4, 3:15 PM EDTHEAVY RAIN 2.821 Ssw High Bridge, NJMESONET STATION CW4354 HIGH BRIDGE.
Aug 4, 3:15 PM EDTHEAVY RAIN 2.86Glen Gardner, NJMESONET STATION GLNGR GLEN GARDNER.
Aug 4, 3:15 PM EDTHEAVY RAIN 3.011 Wsw Pennington, NJMESONET STATION PNNNG PENNINGTON.
Aug 4, 3:45 PM EDTFLOOD2 W Stanton, NJTHE GAUGE ON THE SOUTH BRANCH RARITAN RIVER IN STANTON REACHED FLOOD STAGE AT 345 PM AND CRESTED AT 8.45 FEET (MINOR FLOODING) AT 530 PM ON AUGUST 4.
Aug 4, 4:15 PM EDTFLOOD2 Sse Village Shires, PATHE GAUGE ON NESHAMINY CREEK AT LANGHORNE REACHED FLOOD STAGE AT 415 PM ON AUGUST 4 AND CRESTED AT 11.92 FEET (MINOR FLOODING) AT 215 AM ON AUGUST 5.
Aug 4, 7:15 PM EDTFLOOD1 Ne High Bridge, NJTHE GAUGE ON THE SOUTH BRANCH RARITAN RIVER IN HIGH BRIDGE REACHED FLOOD STAGE AT 715 PM AND CRESTED AT 10.16 FEET (MINOR FLOODING) AT 830 PM ON AUGUST 4.
Aug 4, 11:00 PM EDTFLOOD1 Ese Branchburg Twp, NJTHE GAUGE ON THE NORTH BRANCH RARITAN RIVER AT SOUTH BRANCH REACHED FLOOD STAGE AT 1100 PM AND CRESTED AT 8.11 FEET AT 1115 PM ON AUGUST 4.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.8 hours before the alert went out and 187 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, Brookhaven, NY at 12:00Z on 2020-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1593 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, Brookhaven, NY at 12:00Z on 2020-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 square meters per square second.19395878Sfc1 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
1593 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
570 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
1.5
Supercell composite
7.4

Open this sounding in Storm Lab

The text

As transmitted.

162 
WGUS41 KPHI 041847
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
247 PM EDT Tue Aug 4 2020

NJC019-021-023-035-041-PAC017-050345-
/O.NEW.KPHI.FA.W.0027.200804T1847Z-200805T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
247 PM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has issued a

* Flood Warning for...
  Hunterdon County in northwestern New Jersey...
  Southwestern Warren County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Somerset County in northern New Jersey...
  Middlesex County in northern New Jersey...
  Bucks County in southeastern Pennsylvania...

* Until 1145 PM EDT Tuesday.

* At 243 PM EDT, reporting gauges indicate flooding ongoing on 
  several smaller water ways in the warned area including Neshanic 
  River, Neshaminy Creek, East Branch of the Perkiomen, and 
  Musconnetcong River. Up to 7 inches of rain fell earlier in the 
  day. Any additional rain should be light, but it will take time 
  for the water to recede.

* Some locations that could experience flooding include...
  Trenton, New Brunswick, Somerville, Somerset, Old Bridge, Bensalem,
  East Brunswick, Bridgewater, South Brunswick, Sayreville, North
  Brunswick, Ewing, Middlesex, Princeton, Bound Brook, Manville,
  Bristol, Quakertown, Perkasie and Doylestown.

This includes the following highways...
 New Jersey Turnpike between exits 9 and 10.
 Pennsylvania Turnpike between mile markers 349 and 359.
 Northeast Extension between mile markers 39 and 45.
 Interstate 95 in Pennsylvania between mile markers 37 and 40.
 Interstate 78 in New Jersey between mile markers 6 and 32.
 Interstate 195 in New Jersey between mile markers 0 and 1.
 Interstate 295 in New Jersey between mile markers 60 and 76.
 Interstate 287 in New Jersey between mile markers 6 and 22.
 Garden State Parkway between mile markers 121 and 125.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

A Flood Warning means that flooding is imminent or occurring. All
interested parties should take necessary precautions immediately.

&&

LAT...LON 4007 7491 4009 7496 4012 7497 4042 7549
      4056 7530 4078 7489 4045 7422

$$

SFJ
2 follow-up statements
347 
WGUS81 KPHI 050008
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
808 PM EDT Tue Aug 4 2020

NJC019-021-023-035-041-050016-
/O.CAN.KPHI.FA.W.0027.000000T0000Z-200805T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
808 PM EDT Tue Aug 4 2020

...THE FLOOD WARNING HAS BEEN CANCELLED FOR HUNTERDON...SOUTHWESTERN
WARREN...MERCER...SOMERSET AND MIDDLESEX COUNTIES...

Flood waters are receding and no longer pose a threat.

LAT...LON 4007 7491 4009 7496 4012 7497 4042 7549
      4056 7530 4061 7520 4057 7518 4058 7512
      4054 7507 4042 7506 4040 7496 4033 7494
      4030 7487 4025 7484 4022 7477 4017 7473

$$

PAC017-050345-
/O.CON.KPHI.FA.W.0027.000000T0000Z-200805T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
808 PM EDT Tue Aug 4 2020

...A FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT TUESDAY FOR
BUCKS COUNTY...

At 805 PM EDT, runoff from today's heavy rainfall was continuing to 
cause streams and creeks to remain out of their banks in parts of 
Bucks County.

Some locations that have been experiencing flooding include... 
Bensalem, Bristol, Quakertown, Perkasie, Doylestown, Chalfont, New 
Hope, Yardley, Newtown, Dublin, Tullytown, Langhorne, Ivyland and 
Riegelsville.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 349 and 359.
 Northeast Extension between mile markers 39 and 45.
 Interstate 95 in Pennsylvania between mile markers 37 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

A Flood Warning means that flooding is imminent or occurring. All
interested parties should take necessary precautions immediately.

&&

LAT...LON 4007 7491 4009 7496 4012 7497 4042 7549
      4056 7530 4061 7520 4057 7518 4058 7512
      4054 7507 4042 7506 4040 7496 4033 7494
      4030 7487 4025 7484 4022 7477 4017 7473

$$

Iovino
779 
WGUS81 KPHI 050343
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1143 PM EDT Tue Aug 4 2020

PAC017-050351-
/O.EXP.KPHI.FA.W.0027.000000T0000Z-200805T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-
1143 PM EDT Tue Aug 4 2020

...THE FLOOD WARNING WILL EXPIRE AT 1145 PM EDT FOR BUCKS COUNTY...

Flooding continues along the Neshaminy Creek. Most other streams and 
creeks in Bucks County have returned within their banks. The county-
wide Flood Warning will expire at 11:45 PM.

The Flood Warning continues for the Neshaminy Creek.

LAT...LON 4007 7491 4009 7496 4012 7497 4042 7549
      4056 7530 4061 7520 4057 7518 4058 7512
      4054 7507 4042 7506 4040 7496 4033 7494
      4030 7487 4025 7484 4022 7477 4017 7473

$$

Iovino

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 Aug 4, 1:16 PM EDT, 1 hour 31 minutes earlier.

Area forecast discussion, Aug 4, 1:16 PM EDT, 1 hour 31 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
116 PM EDT Tue Aug 4 2020

.SYNOPSIS...
Tropical Cyclone Isaias is expected to move north and reach the
Mid Atlantic later Tuesday. Isaias will move toward New England
by Wednesday. High pressure will build in to our north later
this week into this weekend while a weak front lingers to our
south.

&&

.NEAR TERM /THROUGH TONIGHT/...
Tornado Watch for the New Jersey and southeast Pennsylvania
cancelled.

Tropical Storm Warning remains in effect.

The center of Tropical Storm Isaias is lifting through the
region, and the heaviest rain is now across eastern Pennsylvania
and northern New Jersey. The tornado threat has lifted north of
the forecast area, so will cancel the Tornado Watch.

Flash flooding continues due to heavy rain of 4-6 inches with
amounts as high as 8", and rain continues.

Winds turning to the west behind departing Isaias, but remain at
Tropical Storm Force.

&&

.SHORT TERM /WEDNESDAY/...
Quieter weather for Wednesday as high pressure starts to build
in to our north. This will bring a mainly dry day with
seasonable temperatures under partly to mostly sunny skies.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
A fairly typical but overall quieter summer pattern is expected
for the long term forecast. The mean upper level trough over the
east will lift out but the mid Atlantic region will remain in a
fairly moist W/SW flow regime around high pressure ridging over
the western Atlantic. This will result in chances for scattered
showers/storms most days that will be mainly diurnally driven
meaning the best chances will be in the afternoon and early
evening. Temperatures will be around average for this time of
year.

&&

.AVIATION /17Z TUESDAY THROUGH SATURDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Today... A rapid deterioration in conditions is expected from
south to north soon after 12z. MVFR to IFR conditions are
expected through much of the day in association with Hurricane
Isaias. Areas of torrential rainfall with low vsbys are likely.
Strong and erratic winds are expected with a sharp change in
wind direction expected during the mid afternoon. Gusts may be
briefly higher than shown in the TAFs especially near MIV and
ACY. While confidence is low in exact details and timing,
confidence is high in the overall trend, with hazardous aviation
conditions expected for most of the area.

Tonight... Mainly VFR. Southwest winds 10 to 20 kt diminishing to 5
to 10 kt. Moderate confidence.

Outlook...

Wednesday through Saturday...Mostly VFR. Scattered SHRA/TSRA
possible each afternoon/evening that would result in brief sub-
VFR conditions at a given terminal. Fog may develop during the
overnight. West winds less than 10 kt on Wednesday, then east to
northeast Thursday through Saturday. LGT/VRB at night. Moderate
confidence.

&&

.MARINE...
Today and Tonight... Tropical Storm Warnings remain in effect as
Isaias moves north through the region. Sustained winds of 45 to
55 kts with gusts up to Hurricane force will continue. Heavy
rain and strong winds will give way to a gradual improving of
conditions later this afternoon. Seas will also build to between
12 and 18 feet over the Atlantic coastal waters. A slow
decrease in seas down towards 5 feet can be expected by
Wednesday morning.

Outlook...

Wednesday morning...Seas may linger near 5 feet on the New Jersey
coastal waters but should subside below advisory criteria by midday.

Wednesday afternoon through Saturday...Sub-advisory winds/seas
expected through the period. Chances of showers/storms through the
period, especially in the afternoon/evening hours.

Rip Currents...

On Tuesday, impacts from Isaias will increase the rip-current risk
level to high. In addition, high surf is expected. A rip
current risk statement and high surf advisory are in effect for
this period, so in conclusion Tuesday will not be a good day to
be at the beach.

The rip current risk will likely remain elevated on Wednesday.

&&

.HYDROLOGY...
Hydro concerns continue early this morning as showers/storms
continue ahead of Isaias. Any of these will be capable of
producing heavy rain with at least localized flash flooding
possible. The heaviest, steadiest rain with the storm will
arrive this morning from south to north with more widespread
flash flooding becoming a big concern during this time. Most
susecptible areas will be near and N/W of the I-95 corridor
especially since places such as in Berks County have received so
much rainfall recently. With Isaias, 3 to 6 inches of rain,
with locally higher amounts are expected. Flooding could be
widespread and significant.

In addition to flash flooding, river flooding is also expected. But
with a more consolidated area of rainfall across PA, the threat
across NJ including the Passaic and Raritan basins has lessened. The
latest MARFC forecast still has about 15 forecast points above
Action Stage and 6 at or above Flood Stage, including, Philadelphia,
Norristown, and Pottstown on the Schuylkill, Graterford on Perkiomen
Creek, Langhorne on Neshaminy Creek, and Chadds Ford and Wilmington
on the Brandywine. The latest forecast has these points cresting
later today or tonight. With such a large swath of precipitation
expected along and west of the I95 corridor, most basins in this
area will see at least some threat. That said, the Delaware River is
expected to remain within its banks.

&&

.TIDES/COASTAL FLOODING...
The coastal flooding impacts from Isaias remain very uncertain at
this time. Models notoriously handle fast-moving, intense cyclones
poorly in our area, as the short duration of onshore flow competes
with the strength of the winds. These competing impacts and
sensitivities are not well understood from a modeling standpoint,
leading to rather large spread in the model guidance.

Coastal flooding impacts are expected across the area today, with
four different regions we will be monitoring. The first, and
potentially most significant, is for the eastern shore of Chesapeake
Bay, where surge will likely move northward during the day. What is
unclear, however, is the strength of this surge. Model guidance is
particularly poor for these areas, and the output the past couple of
days seems unrealistically low. However, the extent of impacts
remains quite unclear. At this point, there is potential for
moderate flooding, which requires continuation of the coastal flood
warning. However, it is possible impacts will be less
significant/widespread. We will likely not have a better idea of
impacts until after daybreak, when gauges in lower Chesapeake Bay
begin to respond.

The second area is Delaware Bay. The real question here will be the
timing of the surge relative to the astronomical high tide.
With guidance trending a little faster with the surge, the timing
looks a little less favorable for coincidence of peak surge and
astronomical high tide for the Delaware Bay sites.
Nevertheless, the strength of southeast winds in advance of Isaias
may compensate much more readily than models suggest. A coastal
flood advisory has been issued here for the entire day given the
uncertainty of peak surge timing.

The third area is the tidal Delaware River. Here, confidence is
increasing that minor flooding will occur during the afternoon, as
predecessor southeast winds will likely combine with freshwater
runoff to lead to a period of tidal flooding from early afternoon to
early evening. As with Delaware Bay, confidence is not particularly
high on exact timing of flooding, so have issued a coastal flood
advisory for a broader period of time than normal (11 am to 8 pm).

The fourth area is the Atlantic coast. As with Delaware Bay, timing
of the strongest surge appears to occur between astronomical high
tides. However, the strength of onshore flow and exacerbating
behavior of wave runup will likely produce areas of flooding. Of
particular concern is back bays that are susceptible to southeast
flow, which can act to trap water. Barnegat Bay and Little Assawoman
Bay are particularly susceptible in these regimes, and these areas
may experience more widespread/significant flooding. Confidence is
pretty low in general for the coast, but given the very strong
onshore flow expected today, suspect at least some impacts in the
especially vulnerable spots are likely.

&&

.EQUIPMENT...
The NOAA Weather Radio All-Hazards broadcast from Hibernia Park
Pennsylvania (Station WNG-704) remains off the air.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Flash Flood Watch until midnight EDT tonight for PAZ054-055-
     060>062-070-071-101>106.
     Tropical Storm Warning for PAZ070-071-101>106.
     Coastal Flood Advisory until 8 PM EDT this evening for PAZ070-
     071-106.
NJ...Flash Flood Watch until midnight EDT tonight for NJZ001-
     007>010-012>027.
     Tropical Storm Warning for NJZ001-007>010-012>027.
     Coastal Flood Advisory until 8 PM EDT this evening for
     NJZ016>019-021-023-024.
     High Rip Current Risk until midnight EDT tonight for NJZ014-
     024>026.
     Coastal Flood Advisory until 2 AM EDT Wednesday for NJZ012>014-
     020-022-025>027.
     High Surf Advisory until midnight EDT tonight for NJZ014-
     024>026.
DE...Flash Flood Watch until midnight EDT tonight for DEZ001>004.
     Tropical Storm Warning for DEZ001>004.
     Coastal Flood Advisory until 8 PM EDT this evening for
     DEZ001>004.
     High Rip Current Risk until midnight EDT tonight for DEZ004.
     High Surf Advisory until midnight EDT tonight for DEZ004.
MD...Flash Flood Watch until midnight EDT tonight for MDZ008-012-
     015-019-020.
     Tropical Storm Warning for MDZ008-012-015-019-020.
     Coastal Flood Warning until 6 AM EDT Wednesday for MDZ008-012-
     015-019-020.
MARINE...Tropical Storm Warning for ANZ430-431-450>455.
&&

Synopsis...Fitzsimmons
Near Term...Fitzsimmons/MPS
Short Term...Fitzsimmons
Long Term...Fitzsimmons/MPS
Aviation...O'Brien
Marine...CMS
Hydrology...WFO PHI
Tides/Coastal Flooding...WFO PHI
Equipment...WFO PHI
Hazardous weather outlook, Aug 4, 1:12 PM EDT, 1 hour 35 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
112 PM EDT Tue Aug 4 2020

PAZ054-055-060>062-051700-
Carbon-Monroe-Berks-Lehigh-Northampton-
112 PM EDT Tue Aug 4 2020

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...

This Hazardous Weather Outlook is for east central Pennsylvania and
northeast Pennsylvania.

.DAY ONE...This afternoon 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.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

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

MDZ008-012-015-019-020-051700-
Cecil-Kent MD-Queen Annes-Talbot-Caroline-
112 PM EDT Tue Aug 4 2020

...COASTAL FLOOD WARNING IN EFFECT UNTIL 6 AM EDT WEDNESDAY...
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TROPICAL STORM WARNING IN EFFECT...

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...This afternoon and tonight.

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

   Coastal Flood Warning.
   Flash Flood Watch.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

NJZ001-007>010-015-PAZ101>105-051700-
Sussex-Warren-Morris-Hunterdon-Somerset-Mercer-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
112 PM EDT Tue Aug 4 2020

...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TROPICAL STORM WARNING IN EFFECT...

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

.DAY ONE...This afternoon 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.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

DEZ001>003-NJZ016>019-021-023-PAZ070-071-106-051700-
New Castle-Kent-Inland Sussex-Salem-Gloucester-Camden-
Northwestern Burlington-Cumberland-Cape May-Delaware-Philadelphia-
Lower Bucks-
112 PM EDT Tue Aug 4 2020

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TROPICAL STORM WARNING IN EFFECT...

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

.DAY ONE...This afternoon 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.
   Coastal Flood Advisory.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

NJZ012-013-020-022-027-051700-
Middlesex-Western Monmouth-Ocean-Atlantic-Southeastern Burlington-
112 PM EDT Tue Aug 4 2020

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY...
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TROPICAL STORM WARNING IN EFFECT...

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

.DAY ONE...This afternoon 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.
   Coastal Flood Advisory.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

NJZ014-025-026-051700-
Eastern Monmouth-Coastal Atlantic-Coastal Ocean-
112 PM EDT Tue Aug 4 2020

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY...
...HIGH SURF ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...HIGH RIP CURRENT RISK IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TROPICAL STORM WARNING IN EFFECT...

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

.DAY ONE...This afternoon and tonight.

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

   High Rip Current Risk.
   Flash Flood Watch.
   Coastal Flood Advisory.
   High Surf Advisory.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

DEZ004-NJZ024-051700-
Delaware Beaches-Atlantic Coastal Cape May-
112 PM EDT Tue Aug 4 2020

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...HIGH SURF ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...HIGH RIP CURRENT RISK IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
...TROPICAL STORM WARNING IN EFFECT...

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

.DAY ONE...This afternoon and tonight.

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

   High Rip Current Risk.
   Flash Flood Watch.
   Coastal Flood Advisory.
   High Surf Advisory.
   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

ANZ430-431-450>455-051700-
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-
112 PM EDT Tue Aug 4 2020

...TROPICAL STORM WARNING IN EFFECT...

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

.DAY ONE...This afternoon and tonight.

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

   Tropical Storm Warning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Tropical Storm Warning.

.SPOTTER INFORMATION STATEMENT...

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

MPS

In the hours before

Local storm report, Aug 4, 2:36 PM EDT, 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
236 PM EDT TUE AUG 4 2020

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

0144 PM     TROPICAL STORM   1 E TOMS RIVER          39.95N 74.17W
08/04/2020                   OCEAN              NJ   PUBLIC

            LARGE TREE UPROOTED ON GOLD AVE IN TOMS
            RIVER.

&&

STAARMANN
Local storm report, Aug 4, 2:38 PM EDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
238 PM EDT TUE AUG 4 2020

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

1143 AM     TROPICAL STORM   LOWER MORELAND TWP      40.12N 75.06W
08/04/2020                   MONTGOMERY         PA   TRAINED SPOTTER

            LARGE TREE (APPROX 4 INCH DIAMETER) DOWN IN
            LOWER MORELAND.

&&

NC
Local storm report, Aug 4, 2:39 PM EDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
239 PM EDT TUE AUG 4 2020

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

1020 AM     TROPICAL STORM   3 S GRASONVILLE         38.92N 76.20W
08/04/2020                   QUEEN ANNE'S       MD   MESONET

            43 MPH SUSTAINED WIND AT PROSPECT BAY
            WEATHER UNDERGROUND SITE.

&&

MPS
Local storm report, Aug 4, 2:42 PM EDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
242 PM EDT TUE AUG 4 2020

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

0130 PM     FLASH FLOOD      2 N EMMAUS              40.57N 75.50W
08/04/2020                   LEHIGH             PA   PUBLIC

            LITTLE LEHIGH CREEK IS OUT OF ITS BANKS.

&&

STAARMANN
Local storm report, Aug 4, 2:43 PM EDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
243 PM EDT TUE AUG 4 2020

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

1014 AM     TROPICAL STORM   2 S TILGHMAN ISLAND     38.68N 76.33W
08/04/2020                   TALBOT             MD   MESONET

            46 MPH SUSTAINED WIND AT BLACKWALNUT HARBOR
            WXFLOW SITE.

&&

MPS
Local storm report, Aug 4, 2:47 PM EDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
247 PM EDT TUE AUG 4 2020

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

0840 AM     TROPICAL STORM   NAZARETH                40.74N 75.31W
08/04/2020                   NORTHAMPTON        PA   PUBLIC

            LARGE LIMBS SNAPPED IN NAZARETH.

&&

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:07 PM EDTSpecial Weather StatementPHIHunterdon, Somerset, Warren23 min
Aug 3, 8:26 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset34 min
Aug 3, 9:02 PM EDTSpecial Weather StatementPHIMorris28 min
Aug 4, 5:17 AM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Salem and 1 more4 hr
Aug 4, 5:55 AM EDTSpecial Marine WarningPHI21 min
Aug 4, 7:28 AM EDTFlash Flood WarningPHIGloucester, Salem3 hr
Aug 4, 8:38 AM EDTSpecial Marine WarningPHI52 min
Aug 4, 9:16 AM EDTTornado WarningPHICumberland18 min
Aug 4, 9:28 AM EDTSpecial Marine WarningPHI32 min
Aug 4, 9:31 AM EDTSpecial Marine WarningPHI59 min
Aug 4, 9:42 AM EDTTornado WarningPHIAtlantic, Cape May19 min
Aug 4, 10:02 AM EDTFlash Flood WarningPHIGloucester, Salem4 hr
Aug 4, 10:15 AM EDTTornado WarningPHIAtlantic, Burlington, Ocean14 min
Aug 4, 10:20 AM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester4 hr
Aug 4, 11:00 AM EDTTornado Warning Tornado observedPHIMonmouth, Ocean11 min
Aug 4, 11:01 AM EDTFlash Flood WarningPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more4 hr
Aug 4, 11:13 AM EDTAreal Flood AdvisoryPHISussex, Warren4 hr
Aug 4, 11:43 AM EDTFlash Flood WarningPHIWarren4 hr
Aug 4, 11:59 AM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Monmouth, Morris, Somerset4 hr
Aug 4, 2:33 PM EDTRiver Flood WarningPHIHunterdon, Somerset5 hr
Aug 4, 3:42 PM EDTAreal Flood WarningPHIWarren4 hr
Aug 4, 4:37 PM EDTAreal Flood WarningPHICumberland, Salem10 hr
Aug 4, 5:04 PM EDTSmall Craft AdvisoryPHI14 hr
Aug 4, 5:30 PM EDTCoastal Flood StatementPHIOcean103 min
Aug 4, 7:23 AM EDTTornado WarningPHIChester, Delaware, Montgomery, Philadelphia20 min
Aug 4, 8:11 AM EDTFlash Flood WarningPHIBucks, Lehigh, Montgomery, Northampton4 hr
Aug 4, 8:19 AM EDTRiver Flood WarningPHIDelaware15 hr
Aug 4, 8:19 AM EDTTornado WarningPHIBucks26 min
Aug 4, 9:23 AM EDTTornado Warning Tornado observedPHIChester22 min
Aug 4, 9:29 AM EDTTornado WarningPHIMonroe, Northampton31 min
Aug 4, 9:38 AM EDTFlash Flood WarningPHIMonroe, Northampton4 hr
Aug 4, 9:58 AM EDTTornado WarningPHIMonroe16 min
Aug 4, 10:51 AM EDTTornado WarningPHIMontgomery24 min
Aug 4, 12:06 PM EDTRiver Flood WarningPHIChester11 hr
Aug 4, 12:37 PM EDTRiver Flood WarningPHIMontgomery14 hr
Aug 4, 12:48 PM EDTRiver Flood WarningPHIChester, Delaware24 hr
Aug 4, 1:01 PM EDTRiver Flood WarningPHIBucks18 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIBerks10 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIMontgomery26 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia43 hr
Aug 4, 1:12 PM EDTRiver Flood WarningPHIMontgomery, Philadelphia35 hr
Aug 4, 1:59 PM EDTAreal Flood WarningPHIChester, Delaware9 hr
Aug 4, 2:09 PM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia15 hr
Aug 4, 2:23 PM EDTRiver Flood WarningPHILehigh16 hr
Aug 4, 4:39 PM EDTRiver Flood WarningPHIMonroe6 hr
Aug 4, 7:29 PM EDTAreal Flood WarningPHILehigh, Northampton12 hr

Nearby

Areal Flood Warnings in New Jersey, 2020Areal Flood Warnings in Pennsylvania, 2020Every areal flood warning in 2020

Sources

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