Alert archive / Pennsylvania / Areal Flood Warnings in 2020

Areal Flood Warning 24, NWS Philadelphia/Mount Holly

August 2, 2020Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 2, 2020, 8:28 AM EDT for Berks County, Pennsylvania. It was in force for 3 hr. 8 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 2, 2020, 8:28 AM EDT (12:28 UTC)
Expired
Aug 2, 2020, 11:33 AM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 158 km from the middle of the area, began a volume at 12:29 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 2, 8:30 AM EDTFLASH FLOOD1 W Temple, PAA SINKHOLE APPROXIMATELY 20 FEET IN DIAMETER AND AT LEAST 8 FEET DEEP DEVELOPED AT US 222 AND SR 61.
Aug 2, 8:34 AM EDTHEAVY RAIN 3.11 W Maiden Creek, PAMESONET STATION LSPRT LEESPORT.
Aug 2, 8:34 AM EDTHEAVY RAIN 3.631 Wnw West Lawn, PAMESONET STATION WSTLW WEST LAWN.
Aug 2, 8:35 AM EDTHEAVY RAIN 2.452 Nw Sinking Spring, PAMESONET STATION SNKNG SINKING SPRING (WILSON W).
Aug 2, 9:39 AM EDTHEAVY RAIN 3.11 W Maiden Creek, PAMESONET STATION LSPRT LEESPORT.
Aug 2, 9:39 AM EDTHEAVY RAIN 3.631 Wnw West Lawn, PAMESONET STATION WSTLW WEST LAWN.
Aug 2, 9:40 AM EDTHEAVY RAIN 2.452 Nw Sinking Spring, PAMESONET STATION SNKNG SINKING SPRING (WILSON W).
Aug 2, 10:30 AM EDTHEAVY RAIN 5.89Reading Regional Airpor, PAA TOTAL OF 5.89 INCHES, OF WHICH 3.44 INCHES FELL WITHIN AN HOUR.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 0.5 hours before the alert went out and 200 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, Washington/Dulle, VA at 12:00Z on 2020-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 444 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, Washington/Dulle, VA at 12:00Z on 2020-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
444 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
730 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted.

085 
WGUS41 KPHI 021228
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
828 AM EDT Sun Aug 2 2020

PAC011-021630-
/O.NEW.KPHI.FA.W.0024.200802T1228Z-200802T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
828 AM EDT Sun Aug 2 2020

The National Weather Service in Mount Holly NJ has issued a

* Flood Warning for...
  Central Berks County in eastern Pennsylvania...

* Until 1230 PM EDT.

* At 826 AM EDT, Doppler radar indicated some lingering areas of 
  moderate to heavy rain in Berks County. Runoff from the 4 to 6 
  inches of rain that fell in parts of the county early this morning 
  will continue to cause some flooding.

* Some locations that could experience continued flooding include...
  Reading, Wyomissing, Kutztown, Hamburg, Fleetwood, Sinking Spring,
  Laureldale, Womelsdorf, Wernersville, Robesonia, Leesport,
  Shoemakersville, Bernville, Lyons, Strausstown, Lenhartsville,
  Spring Ridge, Fairview Hgts, Shillington and West Reading.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 38.
 
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.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4063 7599 4052 7572 4024 7603 4031 7614
      4036 7621 4037 7623 4049 7643

$$

Iovino
1 follow-up statement
391 
WGUS81 KPHI 021533
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1133 AM EDT Sun Aug 2 2020

PAC011-021543-
/O.CAN.KPHI.FA.W.0024.000000T0000Z-200802T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Berks PA-
1133 AM EDT Sun Aug 2 2020

...THE FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL BERKS COUNTY...

Flood waters continue to recede, and are no longer expected to pose 
a threat to life or property. Please continue to heed any road 
closures.

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4063 7599 4052 7572 4024 7603 4031 7614
      4036 7621 4037 7623 4049 7643

$$

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 2, 7:57 AM EDT, 31 minutes earlier.

Area forecast discussion, Aug 2, 7:57 AM EDT, 31 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
757 AM EDT Sun Aug 2 2020

.SYNOPSIS...
A cold front will approach the region from the northwest by
by late today. The frontal boundary will sag south and stall
across the area on Monday before lifting north again Monday
night. Meanwhile, Tropical Cyclone Isaias will continue
northward from Florida and move inland across the eastern
Carolinas on Monday before reaching the Mid-Atlantic on Tuesday.
Isaias and its remnants will move toward New England by Wednesday
with high pressure returning in its wake toward the end of the
week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
As of 750 AM, a warm front is working northward across the
area. A ribbon of more focused low-level warm air advection in
conjuction with an enhanced zone of moisture advection with
precipitable water values around 2 inches. This is centered from
Berks County northeastward through the Lehigh Valley, Poconos
and into far northwestern New Jersey. It is in parts of these
regions were robust convection continues, as MLCAPE of 1500 J/kg
advects northward and into the convection. The ascent has
helped sustain deep convection resulting in locally excessive
rainfall rates and flash flooding. In addition, the 0-1km SRH is
up to 150 m2/s2 due to surface flow from the southeast and then
veering to south and southwest aloft. Even at this early hour,
the SBCAPE is around 1000 J/kg. The small storm cluster from
Berks County now exiting southern Lehigh County and into upper
Bucks County continues to show broad rotation aloft with even an
earlier scan from KDIX radar of tighter rotation. The TPHL
radar scanning lower also shows some rotation however it has not
tightened up as much. If storms can maintain being surface-
based, locally damaging winds will be possible with perhaps a
lingering tornado threat for next few hours.

Otherwise, low pressure is moving northward through Ohio
towards the Great Lakes and this is helping to push a warm front
north towards the area. The low is forecast to continue moving
across the eastern Great Lakes and eventually into southern
Quebec tonight. This will push the warm front through our region
this morning with this first round of convection continuing to
affect mainly our eastern PA zones. The precipitation
associated with the warm front should lift to our north by this
afternoon. However, the front will leave hot humid conditions in
its wake with a weak cold front to our west. The higher temps
and moisture in the fronts wake will cause mixed layer CAPE
values to rise into the 1500 to 2500+ J/kg range in parts of our
region. As a result, some additional showers and thunderstorms
are expected to develop in the afternoon. The system moving
across the eastern Great Lakes will create a decent amount of
shear in our region, especially in our northwestern counties
where bulk shear looks to be 30-40 knots. Limiting factors
though will be lack of forcing and a warm, dry layer near 700
mb. For this reason, storms may tend to be more isolated to
scattered so POPs were lowered slightly with this update. Best
chances for storms still looks to be over eastern PA, especially
N/W of the I-95 corridor as these areas will be closer to the
front to our west. Any storms that occur will have the potential
to become severe with damaging winds being the biggest threat.
Large hail will be possible too though.

Heat index values will likely exceed 100 in the central and southern
parts of our forecast area this afternoon. A heat Advisory
remains in effect for northern Delaware and the Philadelphia
area up into parts of central New Jersey. The criterion for a
Heat Advisory is slightly higher for our counties to south and
they look to not quite get there, even though it will be hot and
humid.

A south to southwest wind 10 to 15 knots is anticipated to develop
after the warm front passes. Highs should range from the lower and
middle 80s in the Poconos and far northern New Jersey to the lower
90s from the Interstate 95 Corridor southeastward. Highs will likely
favor the 80s right along the coast.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM MONDAY/...
Any showers/storms will diminish through this evening but the
departing low to our north will leave a weak, trailing cold
front across the region that will stall out. A few additional
showers may develop along this boundary towards Monday morning.
The sky should vary from mostly to partly cloudy with a light
southwest wind. Lows will likely range from the upper 60s to the
lower 70s.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
Heavy Rainfall to Impact the Region Starting Monday Evening
as Isaias Approaches...

As of 435 AM...
Monday morning a weak cold front will reach the coast and stall
as a shortwave over Quebec rapidly pulls northeast. PWATs
behind the front temporarily fall off towards 1.5" while down
south towards DE the front will likely not make it with PWATs
remaining around 1.80". Behind the wave there will be some brief
subsidence, but this break in the precipitation will be
transient. By Monday afternoon the next weak mid-level wave is
forecast to cross central PA and approach the region. PVA with
the wave is weak, but it will help to wash the warm front north
and create weak surface convergence near the Delaware River.
Forecast soundings across the area destabilize with ML CAPE
values around 1500 J/kg. The region will also remain trapped
between low pressure over the Hudson Bay and high pressure near
Bermuda helping to keep the mid and low level pressure gradient
tight. As a result, persistent 30 to 40 kt flow exists in the
800 to 500 MB layer. Surface to 6 km shear is around 30 to 40
kts which will support the potential for some more organized
convection. Damaging wind gusts will be the primary threat. High
temperatures Monday will be in the mid to upper 80s.

Monday afternoon Tropical Storm Isaias will be approaching South
Carolina with a mid-level ridge axis centered near Bermuda and an
upper level low located near the Hudson Bay. As Isaias
approaches, the weak upper level jet over New York will begin
to rapidly intensify and approach 100+ kts (placing the
northwest portion of the CWA in a RRQ). Also at this time a weak
mid-level ridge axis will exist west/east. The leftover
baroclinic zone from earlier will be located across northern
NJ. The items mentioned above all spell the possibility of a
Predecessor Rainfall Event(PRE) across northern NJ and eastern
PA. The item lacking here is the east/ southeast low level flow
(upslope component). Low level flow is actually out of the
southwest at this time. The latest runs of both the CMC and
ECMWF also hint at this in their respective QPF fields. Given
the above, have raised QPF totals for the I-95 corridor and
northwest for Monday evening into early Tuesday morning.

Rainfall will then likely continue Tuesday out ahead of Isaias as
the upper level jet continues to strengthen (approaching 120
kts) with impressive upper level divergence and diffluence over
the region. This strong upper level lift will continue to feed
further re-generation of showers and isolated thunderstorms.
The mass response in all of the global models is impressive with
a swath of two to four inches of rainfall with isolated
rainfall totals of four to six inches. A Flash Flood Watch for
all of the region will likely be required for Monday evening
through Tuesday.

Tuesday afternoon heavy rainfall will continue across the region as
Isaias moves overhead. The GFS and CMC have the system out area by
Tuesday evening, while the ECMWF waits until early Wednesday
morning, with the NAM even slower waiting until Wednesday around
sunrise. Overall a blend of the GFS and ECMWF appears the way to go,
and is what the NHC forecast reflects.

Wednesday into Thursday the upper level low over the Hudson Bay will
slowly meander east with a cold front moving through the area. The
front will again likely stall near the coast of NJ with surface high
pressure building in over PA/ NY. Depending on where the cold
front stalls, convection could continue along coastal NJ and DE
Wednesday into Thursday. Behind the front expect high
temperatures in the mid 80s, or near normal for this time of
year.

For Friday the front will wash out as the next shortwave approaches
from the west. Shower and thunderstorm chances will then
continue into the weekend as multiple upper level disturbances
traverse the region.

&&

.AVIATION /12Z SUNDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

Today...MVFR and IFR conditions in showers and scattered
thunderstorms in the morning along with low stratus. Becoming
VFR in the afternoon. However, scattered showers and
thunderstorms are expected to develop. Some of the thunderstorms
could be strong to severe. Southwest wind increasing to 10 to
15 knots with gusts of 20-25 knots. Low confidence on whether
and additional thunderstorms affect any specific TAF site.

Tonight...VFR as any storms diminish. SW winds 5-10 knots.
Moderate to High confidence.

Outlook...
Monday...Prevailing VFR with ceilings lowering after 00Z
Tuesday. Scattered showers and thunderstorms developing Monday
afternoon. Winds southwesterly around 5-10 kts. Moderate
confidence.

Tuesday...Prevailing MVFR likely with IFR ceiling and visibility
restrictions possible. Widespread and numerous heavy rain showers
with embedded thunderstorms starting early Tuesday morning.
Prevailing winds southeasterly around 10-15 kts with higher
gusts. Sustained winds and gusts potentially much higher within
showers and storms. Conditions will be dependent on the exact
track of Isaias. High confidence on reduced restrictions, low
confidence on timing.

Wednesday...Generally improving conditions as a cold front moves
through the region. The cold front will likely stall near the
coast with showers and thunderstorms possible along the coastal
TAF sites. Prevailing westerly winds around 5-10 kts. Low
confidence.

Thursday... VFR conditions with light northerly winds. Winds
veering from the southeast by Thursday evening.

&&

.MARINE...
A southeast to south wind is expected on the coastal waters of New
Jersey and Delaware today. Wind speeds are forecast to increase
gradually to 15 to 20 knots. Wind gusts up to around 25 knots
are likely on the waters off New Jersey from late Sunday into
Sunday evening.

Waves on our ocean waters are anticipated to build near 5 feet for
late into tonight. A Small Craft Advisory for the waters off
New Jersey remains in effect from 4:00 PM Sunday until 6:00 AM
Monday.

Outlook...
Monday through Wednesday...Conditions will be dependent on the
track of Isaias, although hazardous winds and seas are likely,
especially Tuesday. Winds potentially of tropical storm force
along with seas of 15-20 feet possible.

Thursday... Seas decreasing to 3 to 5 feet as winds turn from
the west and relax.

Rip currents...
For Sunday, the surf height will be increasing however the
period should be shorter. For this reason, we continue a
moderate risk.

A significant increase in rip current potential is likely into
early next week as Tropical Storm Isaias tracks near the East
Coast with Tuesday potentially being a particularly high risk
day.

&&

.TIDES/COASTAL FLOODING...
At this point there remains considerable uncertainty with the
track and timing of Isaias, and thus the ultimate impacts it may
have on tide levels primarily Tuesday into Wednesday. As of
current peak impacts appear to be Tuesday afternoon, or during
low tide. Any slow down or increase of speed with Isaias will
easily change the impacts though.

&&

.EQUIPMENT...
The NOAA Weather Radio All-Hazards broadcast from Hibernia
Park, Pennsylvania (Station WNG-704) remains off the air, but
repairs are anticipated soon.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory from noon today to 8 PM EDT this evening for
     PAZ070-071-102-104-106.
NJ...Heat Advisory from noon today to 8 PM EDT this evening for
     NJZ010-012-013-015>020-027.
DE...Heat Advisory from noon today to 8 PM EDT this evening for
     DEZ001.
MD...None.
MARINE...Small Craft Advisory from 4 PM this afternoon to 6 AM EDT
     Monday for ANZ450>455.
     Small Craft Advisory from 4 PM this afternoon to midnight EDT
     tonight for ANZ431.

&&

Synopsis...Haines
Near Term...Fitzsimmons/Gorse
Short Term...Fitzsimmons
Long Term...Haines
Aviation...Fitzsimmons/Haines
Marine...Fitzsimmons/Haines
Tides/Coastal Flooding...WFO PHI
Equipment...WFO PHI
Hazardous weather outlook, Aug 2, 4:34 AM EDT, 3 hours 54 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
434 AM EDT Sun Aug 2 2020

NJZ001-007>009-PAZ054-055-060>062-101-103-105-030845-
Sussex-Warren-Morris-Hunterdon-Carbon-Monroe-Berks-Lehigh-
Northampton-Western Chester-Western Montgomery-Upper Bucks-
434 AM EDT Sun Aug 2 2020

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

.DAY ONE...Today and tonight.

Isolated to scattered thunderstorms are possible this afternoon and
this evening. Some storms may be severe with a primary threat of
damaging winds.

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

Additional thunderstorms, some strong to severe, are possible Monday
afternoon and evening.

Heavy rainfall is also possible from Monday night into Tuesday night
as Tropical Storm Isaias approaches. This may result in flash
flooding and potentially river and stream flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

NJZ010-030845-
Somerset-
434 AM EDT Sun Aug 2 2020

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for northern 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.

   Heat Advisory.

Isolated to scattered thunderstorms are possible this afternoon and
this evening. Some storms may be severe with a primary threat of
damaging winds.

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

Additional thunderstorms, some strong to severe, are possible Monday
afternoon and evening.

Heavy rainfall is also possible from Monday night into Tuesday night
as Tropical Storm Isaias approaches. This may result in flash
flooding and potentially river and stream flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

DEZ002-003-MDZ008-012-015-019-020-NJZ021>023-030845-
Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-Caroline-
Cumberland-Atlantic-Cape May-
434 AM EDT Sun Aug 2 2020

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

.DAY ONE...Today and tonight.

Isolated to scattered thunderstorms are possible this afternoon and
this evening. Some storms may be severe with a primary threat of
damaging winds.

Heat indices are forecast to be around 100 to 105 on Sunday
afternoon.

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

Additional thunderstorms, some strong to severe, are possible Monday
afternoon and evening.

Heavy rainfall is also possible from Monday night into Tuesday night
as Tropical Storm Isaias approaches. This may result in flash
flooding and potentially river and stream flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

DEZ001-NJZ012-013-015>020-027-PAZ070-071-102-104-106-030845-
New Castle-Middlesex-Western Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Southeastern Burlington-Delaware-
Philadelphia-Eastern Chester-Eastern Montgomery-Lower Bucks-
434 AM EDT Sun Aug 2 2020

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...

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

   Heat Advisory.

Isolated to scattered thunderstorms are possible this afternoon and
this evening. Some storms may be severe with a primary threat of
damaging winds.

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

Additional thunderstorms, some strong to severe, are possible Monday
afternoon and evening.

Heavy rainfall is also possible from Monday night into Tuesday night
as Tropical Storm Isaias approaches. This may result in flash
flooding and potentially river and stream flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

DEZ004-NJZ014-024>026-030845-
Delaware Beaches-Eastern Monmouth-Atlantic Coastal Cape May-
Coastal Atlantic-Coastal Ocean-
434 AM EDT Sun Aug 2 2020

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

.DAY ONE...Today and tonight.

There is a moderate risk for the formation of dangerous rip currents
today.

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

An elevated risk for rip currents is expected to continue through the
first half of this week due to the effects of Tropical Storm Isaias.

Heavy rainfall is also possible from Monday night into Tuesday night
as Tropical Storm Isaias approaches. This may result in flash
flooding and potentially river and stream flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

ANZ430-431-450>455-030845-
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-
434 AM EDT Sun Aug 2 2020

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

.DAY ONE...Today and tonight.

There is a low probability for widespread hazardous weather.

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

Strong winds and dangerous seas are possible on the coastal waters
especially from Monday night through Tuesday night as Tropical Storm
Isaias passes near or over the area.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

In the hours before

Local storm report, Aug 2, 7:53 AM EDT, 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
753 AM EDT SUN AUG 2 2020

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

0723 AM     FLASH FLOOD      MUHLENBERG TWP          40.39N 75.94W
08/02/2020                   BERKS              PA   PUBLIC

            MOVING WATER OVER THE ROAD AT THE
            INTERSECTION OF HAIN AVE AND LAUREL RUN AVE
            IN READING FROM SOCIAL MEDIA.

&&

DEAL
Special weather statement, Aug 2, 7:54 AM EDT, 34 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
754 AM EDT Sun Aug 2 2020

PAZ060-061-021230-
Lehigh-Berks-
754 AM EDT Sun Aug 2 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN BERKS AND NORTHWESTERN
LEHIGH COUNTIES...

At 754 AM EDT, a strong thunderstorm was located near McKeansburg, or
10 miles south of Tamaqua, moving northeast at 15 mph.

Wind gusts up to 40 mph are possible with this storm.

Locations impacted include...
Hamburg, Wanamakers and New Tripoli.

This includes Interstate 78 in Pennsylvania between mile markers 32
and 36.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4063 7600 4065 7598 4069 7587 4070 7583
      4073 7576 4073 7575 4063 7565 4056 7598
      4060 7601
TIME...MOT...LOC 1154Z 243DEG 13KT 4064 7594

Staarmann
Local storm report, Aug 2, 8:02 AM EDT, 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
802 AM EDT SUN AUG 2 2020

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

0750 AM     FLASH FLOOD      LAURELDALE              40.39N 75.92W
08/02/2020                   BERKS              PA   TRAINED SPOTTER

            TRAINED SPOTTER REPORTS MULTIPLE AREAS OF
            SEVERE FLASH FLOODING IN LAURELDALE AND
            MUHLENBERG TWP. SEVERAL WATER RESCUES
            REPORTED AND TREE LIMBS DOWN AS WELL.

&&

STAARMANN
Special weather statement, Aug 2, 8:06 AM EDT, 22 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
806 AM EDT Sun Aug 2 2020

NJZ007-009-PAZ062-105-021230-
Hunterdon-Warren-Upper Bucks-Northampton-
806 AM EDT Sun Aug 2 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN HUNTERDON...
SOUTHWESTERN WARREN...NORTH CENTRAL BUCKS AND SOUTHEASTERN
NORTHAMPTON COUNTIES...

At 806 AM EDT, a strong thunderstorm was located over Riegelsville,
or near Easton, moving northeast at 15 mph.

Wind gusts up to 40 mph are possible with this storm.

Locations impacted include...
Easton, Wilson, Harmony, Alpha, Ferndale, Frenchtown, West Easton,
Milford, Bloomsbury, Riegelsville, Glendon, Old Orchard and
Phillipsburg.

This includes the following highways...
 Interstate 78 in Pennsylvania between mile markers 71 and 76.
 Interstate 78 in New Jersey between mile markers 0 and 14.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4051 7522 4063 7530 4079 7508 4055 7488
TIME...MOT...LOC 1206Z 243DEG 13KT 4060 7519

Staarmann
Local storm report, Aug 2, 8:06 AM EDT, 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
806 AM EDT SUN AUG 2 2020

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

0740 AM     FLASH FLOOD      1 SW MAIDEN CREEK       40.44N 75.91W
08/02/2020                   BERKS              PA   PUBLIC

            HIGHWAY 222 FLOODED ACROSS THE ROAD AT THE
            DRIES RD INTERSECTION IN MAIDENCREEK.

&&

DEAL
Special weather statement, Aug 2, 8:24 AM EDT, 4 minutes before
Special Weather Statement
National Weather Service Mount Holly NJ
824 AM EDT Sun Aug 2 2020

PAZ054-061-062-021300-
Lehigh-Northampton-Carbon-
824 AM EDT Sun Aug 2 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN LEHIGH...SOUTHEASTERN
CARBON AND WEST CENTRAL NORTHAMPTON COUNTIES...

At 824 AM EDT, a strong thunderstorm was located over New Tripoli, or
11 miles south of Lehighton, moving northeast at 25 mph.

Wind gusts up to 45 mph are possible with this storm.

Locations impacted include...
Allentown, Bethlehem, Northampton, Palmerton, Slatington, Walnutport,
Danielsville, Neffs, Coffeetown, New Tripoli, Berlinsville, Jordan
Valley, Emerald, Beersville, Schnecksville, Claussville, Catasauqua,
Coplay, North Catasauqua and Bowmanstown.

This includes the following highways...
 Northeast Extension between mile markers 58 and 73.
 Interstate 78 in Pennsylvania between mile markers 45 and 47.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4072 7580 4074 7576 4075 7576 4087 7556
      4064 7538 4057 7573 4059 7576 4070 7582
TIME...MOT...LOC 1224Z 245DEG 21KT 4067 7572

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 3:32 AM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 2, 4:42 AM EDTFlash Flood WarningPHIBerks4 hr
Aug 2, 6:30 AM EDTSevere Thunderstorm WarningPHIBerks, Lehigh45 min
Aug 2, 6:37 AM EDTTornado WarningPHIBerks, Lehigh23 min
Aug 2, 6:56 AM EDTTornado WarningPHIBerks, Lehigh34 min
Aug 2, 7:13 AM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Northampton3 hr
Aug 2, 7:29 AM EDTSpecial Weather StatementPHILehigh31 min
Aug 2, 7:34 AM EDTAreal Flood AdvisoryPHIBucks, Lehigh, Northampton3 hr
Aug 2, 7:39 AM EDTTornado WarningPHIBucks, Lehigh, Northampton36 min
Aug 2, 7:49 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton84 min
Aug 2, 7:54 AM EDTSpecial Weather StatementPHILehigh36 min
Aug 2, 8:24 AM EDTSpecial Weather StatementPHILehigh36 min
Aug 2, 8:46 AM EDTAreal Flood AdvisoryPHINorthampton3 hr
Aug 2, 3:33 PM EDTFlash Flood WatchPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more48 hr
Aug 2, 5:04 PM EDTTropical Storm WatchPHIBucks, Delaware, Montgomery, Philadelphia18 hr
Aug 2, 5:14 PM EDTSpecial Weather StatementPHICarbon, Monroe31 min
Aug 2, 5:51 PM EDTSpecial Weather StatementPHILehigh, Northampton39 min
Aug 2, 6:29 PM EDTSpecial Weather StatementPHINorthampton31 min

Nearby

Areal 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.