Alert archive / Pennsylvania / Areal Flood Warnings in 2020

Areal Flood Warning 25, NWS Philadelphia/Mount Holly

August 4, 2020Cecil County, Maryland; Chester County, Delaware County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 4, 2020, 1:59 PM EDT for Cecil County, Maryland; Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 9 hr. 36 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, 1:59 PM EDT (17:59 UTC)
Expired
Aug 4, 2020, 11:01 PM EDT
In force
9 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties New Castle County, DE, Cecil County, MD, Chester County, PA, Delaware County, PA

What was reported inside it

TimeReportWhereRemark
Aug 4, 2:00 PM EDTHEAVY RAIN 4.972 N Avondale, PAMESONET STATION AVOP1 2.4 N AVONDALE.
Aug 4, 2:15 PM EDTHEAVY RAIN 2.681 S Marshallton, PAMESONET STATION NBKP1 NORTHBROOK.
Aug 4, 2:17 PM EDTHEAVY RAIN 5.75Glen Mills, PAREPORTED AT GLEN MILLS.
Aug 4, 2:27 PM EDTHEAVY RAIN 5.8West Nottingham, MDMESONET STATION DW3118 COLORA.
Aug 4, 2:41 PM EDTHEAVY RAIN 4.331 Sw Willistown Twp, PAMESONET STATION AS641 WESTTOWN.
Aug 4, 3:00 PM EDTHEAVY RAIN 3.621 Ese Winterthur, DEMESONET STATION FW0515 GREENVILLE.
Aug 4, 3:00 PM EDTHEAVY RAIN 4.161 Ne Lenape, PAMESONET STATION DW8297 WESTTOWN.
Aug 4, 3:00 PM EDTHEAVY RAIN 5.66Brookside, DECO-OP OBSERVER STATION NEWD1 BROOKSIDE.
Aug 4, 3:01 PM EDTHEAVY RAIN 3.581 N Woodshade, DEMESONET STATION FW2774 NEWARK.
Aug 4, 3:01 PM EDTHEAVY RAIN 4.372 Ssw Lincoln Universit, PAMESONET STATION AV071 OXFORD.
Aug 4, 3:01 PM EDTHEAVY RAIN 5.75Boothwyn, PAMESONET STATION FW6806 UPPER CHICHESTER.
Aug 4, 3:09 PM EDTHEAVY RAIN 6.11 Ene Westwood Manor, DEMESONET STATION WILMG WILMINGTON (ST. EDMONS).
Aug 4, 3:10 PM EDTHEAVY RAIN 3.65Westfield, DEMESONET STATION FW5915 WILMINGTON.
Aug 4, 3:10 PM EDTHEAVY RAIN 4.73Carrcroft, DEMESONET STATION FW0038 WILMINGTON.
Aug 4, 3:10 PM EDTHEAVY RAIN 5.251 Ne Talleyville, DEMESONET STATION 3035D TALLEYVILLE.
Aug 4, 3:11 PM EDTHEAVY RAIN 3.331 Sse Exton, PAMESONET STATION AS680 WEST WHITELAND TWP.
Aug 4, 3:11 PM EDTHEAVY RAIN 3.552 W Oxford, PAMESONET STATION DW0520 OXFORD.
Aug 4, 3:11 PM EDTHEAVY RAIN 4.081 W Ashland, DEMESONET STATION AR506 HOCKESSIN.
Aug 4, 3:11 PM EDTHEAVY RAIN 5.812 Ssw Cheyney, PAMESONET STATION EW8556 THORNTON.
Aug 4, 3:11 PM EDTHEAVY RAIN 5.982 Se Pleasant Hill, MDMESONET STATION EW3643 ELKTON.
Aug 4, 3:12 PM EDTHEAVY RAIN 21 Wsw Sadsburyville, PAMESONET STATION EW5207 SADSBURYVILLE.
Aug 4, 3:12 PM EDTHEAVY RAIN 5.471 Nne Penn Twp, PAMESONET STATION AV669 COCHRANVILLE.
Aug 4, 3:13 PM EDTHEAVY RAIN 3.242 Ssw West Chester, PAMESONET STATION FW7931 WEST CHESTER.
Aug 4, 3:13 PM EDTHEAVY RAIN 4.071 Ne Lenape, PAMESONET STATION EW8943 WEST CHESTER.
Aug 4, 3:13 PM EDTHEAVY RAIN 4.91Atglen, PAMESONET STATION DW6440 ATGLEN.
Aug 4, 3:13 PM EDTHEAVY RAIN 5.221 Wnw East Brandywine T, PAMESONET STATION AS897 DOWNINGTOWN.
Aug 4, 3:14 PM EDTHEAVY RAIN 4.561 Se Oxford, PAMESONET STATION OXFPG OXFORD (PENNS GROVE).
Aug 4, 3:14 PM EDTHEAVY RAIN 4.61 Se New London Twp., PAMESONET STATION AU860 NEW LONDON.
Aug 4, 3:15 PM EDTHEAVY RAIN 2.721 Nw Thornbury Twp, PAMESONET STATION WSTTW 1 NW THORNBURY TWP.
Aug 4, 3:15 PM EDTHEAVY RAIN 4.671 Nnw East Caln Twp, PAMESONET STATION ELVPA 1 NNW EAST CALN TWP.
Aug 4, 3:15 PM EDTHEAVY RAIN 4.672 S East Goshen Twp., PAMESONET STATION AT593 WEST CHESTER.
Aug 4, 3:15 PM EDTHEAVY RAIN 5.251 S Lima, PAMESONET STATION FW3096 MEDIA.
Aug 4, 3:15 PM EDTHEAVY RAIN 5.581 S West Chester, PAMESONET STATION WSTPA WEST CHESTER.
Aug 4, 3:22 PM EDTFLOOD1 N Elk Twp, PAFLOODING ON STATE HIGHWAY 841 NEAR LEWISVILLE ROAD. TIME BASED ON DISPATCH REPORT.
Aug 4, 3:30 PM EDTFLOODPrices Corner, DEMINOR FLOODING IN PRICES CORNER WITH 5 INCHES OF RAIN.
Aug 4, 10:45 PM EDTFLOODHenry Clay, DETHE GAUGE ON BRANDYWINE CREEK AT WILMINGTON REACHED FLOOD STAGE AT 1045 PM ON AUGUST 4 AND CRESTED AT 18.62 FEET (MODERATE FLOODING) AT 300 AM ON AUGUST 5.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.0 hours before the alert went out and 215 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 2020-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 472 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 2020-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 254 square meters per square second.1939587897Sfc1 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
472 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
254 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.8
Supercell composite
2.9

Open this sounding in Storm Lab

The text

As transmitted.

798 
WGUS41 KPHI 041759
FLWPHI

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

DEC003-MDC015-PAC029-045-050000-
/O.NEW.KPHI.FA.W.0025.200804T1759Z-200805T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Cecil MD-Chester PA-Delaware PA-
159 PM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has issued a

* Flood Warning for...
  Northern New Castle County in northern Delaware...
  Northern Cecil County in northeastern Maryland...
  Chester County in southeastern Pennsylvania...
  Southwestern Delaware County in southeastern Pennsylvania...

* Until 800 PM EDT Tuesday.

* At 158 PM EDT, reporting gauges indicate flooding occuring along 
  the west branch of Brandywine Creek, Red Clay creek, and white 
  clay creek. We have also had reports of flooding along smaller 
  waterways. Roadway flooding is also possible downstream of the 
  Pine Grove Dam on Octoraro Creek. Up to 5 inches of rain fell 
  earlier in the day. Any additional rain should be light, but it 
  will take time for runoff to recede.


* Some locations that could experience flooding include...
  Wilmington, Newark, West Chester, Calvert, Chester, Coatesville,
  Westtown, Downingtown, Elsmere, Kennett Square, Oxford, Parkesburg,
  West Grove, Rising Sun, Honey Brook, Newport, Arden, Glen Roy,
  Blake and Stanton.

This includes the following highways...
 Interstate 95 in Pennsylvania between mile markers 0 and 7.
 Interstate 95 in Delaware between mile markers 6 and 23.
 Interstate 95 in Maryland between mile markers 101 and 102.
 Interstate 476 in Pennsylvania near mile marker 0.

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 3972 7614 3974 7612 3973 7610 3976 7606
      3983 7604 3987 7599 3995 7600 4004 7593
      4011 7594 4014 7587 3986 7531 3977 7546
      3970 7550 3965 7579 3963 7616 3972 7623

$$

SFJ
2 follow-up statements
467 
WGUS41 KPHI 042347
FLWPHI

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

DEC003-MDC015-PAC029-045-051200-
/O.EXT.KPHI.FA.W.0025.000000T0000Z-200805T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Cecil MD-Chester PA-Delaware PA-
747 PM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has extended the

* Flood Warning for...
  Northern New Castle County in northern Delaware...
  Northern Cecil County in northeastern Maryland...
  Chester County in southeastern Pennsylvania...
  Southwestern Delaware County in southeastern Pennsylvania...

* Until 800 AM EDT Wednesday.

*  At 745 PM EDT, runoff from today's heavy rainfall was continuing 
   to cause flooding. Many streams and creeks remained out of their 
   banks.

* Some locations that are experiencing flooding include...
  Wilmington, Newark, West Chester, Calvert, Chester, Coatesville,
  Westtown, Downingtown, Elsmere, Kennett Square, Oxford, Parkesburg,
  West Grove, Rising Sun, Honey Brook, Newport, Arden, Glen Roy,
  Blake and Stanton.

This includes the following highways...
 Interstate 95 in Pennsylvania between mile markers 0 and 7.
 Interstate 95 in Delaware between mile markers 6 and 23.
 Interstate 95 in Maryland between mile markers 101 and 102.
 Interstate 476 in Pennsylvania near mile marker 0.

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.

Excessive runoff will continue to cause flooding of small creeks and 
streams, urban areas, highways, streets and underpasses as well as 
other drainage areas and low lying spots.

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

&&

LAT...LON 3972 7614 3974 7612 3973 7610 3976 7606
      3983 7604 3987 7599 3995 7600 4004 7593
      4011 7594 4014 7587 3986 7531 3977 7546
      3970 7550 3965 7579 3963 7616 3972 7623

$$

Iovino
455 
WGUS81 KPHI 050301
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1101 PM EDT Tue Aug 4 2020

DEC003-MDC015-PAC029-045-050309-
/O.CAN.KPHI.FA.W.0025.000000T0000Z-200805T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Cecil MD-Chester PA-Delaware PA-
1101 PM EDT Tue Aug 4 2020

...THE FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN NEW CASTLE...
NORTHERN CECIL...CHESTER AND SOUTHWESTERN DELAWARE COUNTIES...

Flooding continues along parts of the White Clay Creek and the 
Brandywine Creek. Otherwise, most streams and creeks in the area 
have returned within their banks.

Flood Warnings continue for the While Clay Creek and the Brandywine 
Creek.

LAT...LON 3972 7614 3974 7612 3973 7610 3976 7606
      3983 7604 3987 7599 3995 7600 4004 7593
      4011 7594 4014 7587 3986 7531 3977 7546
      3970 7550 3965 7579 3963 7616 3972 7623

$$

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, 43 minutes earlier.

Area forecast discussion, Aug 4, 1:16 PM EDT, 43 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, 47 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, 1:37 PM EDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
137 PM EDT TUE AUG 4 2020

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

1200 PM     TROPICAL STORM   1 WNW SEWELL            39.77N 75.16W
08/04/2020                   GLOUCESTER         NJ   PUBLIC

            MULTIPLE TREES DOWN ON BREAKNECK ROAD IN
            MANTUA.

&&

STAARMANN
Local storm report, Aug 4, 1:38 PM EDT, 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
138 PM EDT TUE AUG 4 2020

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

1200 PM     TROPICAL STORM   1 E WENONAH             39.79N 75.14W
08/04/2020                   GLOUCESTER         NJ   PUBLIC

            LARGE TREE DOWN ON WOODBURY GLASSBORO ROAD
            IN MANTUA.

&&

STAARMANN
Local storm report, Aug 4, 1:48 PM EDT, 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
148 PM EDT TUE AUG 4 2020

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

0120 PM     TROPICAL STORM   3 NE BRIGANTINE         39.43N 74.34W
08/04/2020                   ATLANTIC           NJ   PUBLIC

            VIDEO ON SOCIAL MEDIA OF SUSTAINED WINDS OF
            50-60 MPH BEING MEASURED ON A HANDHELD
            ANEMOMETER.

&&

STAARMANN
Local storm report, Aug 4, 1:54 PM EDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
154 PM EDT TUE AUG 4 2020

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

1105 AM     TROPICAL STORM   1 WSW DOYLESTOWN        40.31N 75.15W
08/04/2020                   BUCKS              PA   TRAINED SPOTTER

            SEVERE DAMAGE AROUND THE DOYLESTOWN
            HOSPITAL. THIS DAMAGE POSSIBLY OCCURRED FROM
            A TORNADO. TIME ESTIMATED FROM RADAR.

&&

STAARMANN
Local storm report, Aug 4, 1:55 PM EDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
155 PM EDT TUE AUG 4 2020

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

0145 PM     TROPICAL STORM   LEHIGH TWP              40.76N 75.54W
08/04/2020                   NORTHAMPTON        PA   EMERGENCY MNGR

            NUMEROUS TREES DOWN IN LEHIGH TOWNSHIP.

&&

NC
Local storm report, Aug 4, 1:59 PM EDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
159 PM EDT TUE AUG 4 2020

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

0130 PM     TROPICAL STORM   EAST GREENVILLE         40.40N 75.50W
08/04/2020                   MONTGOMERY         PA   TRAINED SPOTTER

            LARGE BRANCH DOWN (APPROX 6 INCHES IN
            DIAMETER).

&&

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 1:33 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot4 hr
Aug 4, 2:10 AM EDTFlash Flood WarningPHICaroline, Kent, Queen Anne's, Talbot4 hr
Aug 4, 5:17 AM EDTAreal Flood AdvisoryPHICecil, Kent4 hr
Aug 4, 6:55 AM EDTTornado WarningPHIKent, Queen Anne's35 min
Aug 4, 7:22 AM EDTTornado WarningPHIKent, Queen Anne's23 min
Aug 4, 7:50 AM EDTFlash Flood WarningPHICaroline, Kent, Queen Anne's, Talbot4 hr
Aug 4, 8:13 AM EDTTornado WarningPHIKent, Queen Anne's, Talbot26 min
Aug 4, 8:27 AM EDTTornado WarningPHICaroline, Cecil, Kent, Queen Anne's33 min
Aug 4, 8:50 AM EDTFlash Flood WarningPHICaroline, Cecil, Kent, Queen Anne's4 hr
Aug 4, 8:56 AM EDTTornado WarningPHICecil34 min
Aug 4, 9:23 AM EDTFlash Flood WarningPHICecil4 hr
Aug 4, 9:23 AM EDTTornado Warning Tornado observedPHICecil22 min
Aug 4, 7:23 AM EDTTornado WarningPHIChester, Delaware, Montgomery, Philadelphia20 min
Aug 4, 7:28 AM EDTFlash Flood WarningPHIChester, Delaware, Montgomery3 hr
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, 9:29 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, 10:02 AM EDTFlash Flood WarningPHIChester, Delaware4 hr
Aug 4, 10:20 AM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Aug 4, 10:51 AM EDTTornado WarningPHIMontgomery24 min
Aug 4, 11:01 AM EDTFlash Flood WarningPHIBucks4 hr
Aug 4, 11:13 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton4 hr
Aug 4, 11:43 AM EDTFlash Flood WarningPHIBerks, Lehigh, Northampton4 hr
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, 2:09 PM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia15 hr
Aug 4, 2:23 PM EDTRiver Flood WarningPHILehigh16 hr
Aug 4, 2:47 PM EDTAreal Flood WarningPHIBucks9 hr
Aug 4, 3:42 PM EDTAreal Flood WarningPHILehigh, Northampton4 hr
Aug 4, 4:39 PM EDTRiver Flood WarningPHIMonroe6 hr
Aug 4, 7:29 PM EDTAreal Flood WarningPHILehigh, Northampton12 hr
Aug 4, 4:50 AM EDTTornado WarningPHISussex25 min
Aug 4, 7:39 AM EDTTornado WarningPHISussex36 min
Aug 4, 7:51 AM EDTTornado WarningPHISussex24 min
Aug 4, 8:15 AM EDTTornado WarningPHIKent45 min
Aug 4, 8:18 AM EDTTornado WarningPHISussex27 min
Aug 4, 8:58 AM EDTFlash Flood WarningPHIKent, New Castle, Sussex3 hr
Aug 4, 9:06 AM EDTRiver Flood WarningPHINew Castle11 hr
Aug 4, 10:38 AM EDTRiver Flood WarningPHINew Castle14 hr
Aug 4, 12:27 PM EDTRiver Flood WarningPHINew Castle10 hr
Aug 4, 12:48 PM EDTRiver Flood WarningPHINew Castle24 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2020Areal Flood Warnings in Maryland, 2020Areal Flood Warnings in Delaware, 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.