Flash Flood Warning 108, NWS Philadelphia/Mount Holly

954 
WGUS71 KPHI 072047
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
447 PM EDT Fri Aug 7 2026

PAC089-095-072230-
/O.CON.KPHI.FF.W.0108.000000T0000Z-260807T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
447 PM EDT Fri Aug 7 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT THIS 
EVENING FOR NORTHEASTERN NORTHAMPTON AND CENTRAL MONROE COUNTIES...

At 447 PM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 
1.5 and 2.5 inches of rain have fallen. The expected rainfall rate 
is 0.5 to 1 inch in 1 hour. Additional rainfall amounts of 0.5 to 1 
inch are possible in the warned area. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets, and underpasses as well as other
         drainage and low lying areas.

Some locations that may experience flash flooding include...
  East Stroudsburg, Bangor, Pen Argyl, Wind Gap, East Bangor, 
  Delaware Water Gap, Stormville, Analomink, Saylorsburg, Henryville 
  and Alpine Mountain.

This includes the following highways...
	Interstate 80 in New Jersey near mile marker 0.
	Interstate 80 in Pennsylvania between mile markers 304 and 314.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4112 7525 4115 7516 4114 7508 4109 7504
      4103 7505 4099 7513 4097 7513 4097 7512
      4094 7511 4091 7508 4085 7508 4084 7510
      4083 7509 4082 7509 4081 7544

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR

$$

Cooper

030 
WGUS71 KPHI 072157
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
557 PM EDT Fri Aug 7 2026

PAC089-095-072230-
/O.CON.KPHI.FF.W.0108.000000T0000Z-260807T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
557 PM EDT Fri Aug 7 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT THIS 
EVENING FOR NORTHEASTERN NORTHAMPTON AND CENTRAL MONROE COUNTIES...

At 557 PM EDT, emergency management reported thunderstorms producing 
heavy rain with numerous instances of flash flooding near and along 
the Interstate 80 corridor. Between 2.5 and 3.5 inches of rain have 
fallen. Additional rainfall amounts up to 0.5 inches are possible in 
the warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management reported.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets, and underpasses as well as other
         drainage and low lying areas.

Some locations that may experience flash flooding include...
  East Stroudsburg, Bangor, Pen Argyl, Wind Gap, East Bangor, 
  Delaware Water Gap, Stormville, Analomink, Saylorsburg, Henryville 
  and Alpine Mountain.

This includes the following highways...
	Interstate 80 in New Jersey near mile marker 0.
	Interstate 80 in Pennsylvania between mile markers 304 and 314.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4112 7525 4115 7516 4114 7508 4109 7504
      4103 7505 4099 7513 4097 7513 4097 7512
      4094 7511 4091 7508 4085 7508 4084 7510
      4083 7509 4082 7509 4081 7544

FLASH FLOOD...OBSERVED

$$

Cooper

852 
WGUS71 KPHI 072229
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
629 PM EDT Fri Aug 7 2026

PAC089-095-072239-
/O.EXP.KPHI.FF.W.0108.000000T0000Z-260807T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe PA-Northampton PA-
629 PM EDT Fri Aug 7 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM EDT THIS EVENING FOR 
NORTHEASTERN NORTHAMPTON AND CENTRAL MONROE COUNTIES...

The heavy rain has ended. Please continue to heed remaining road 
closures.

&&

LAT...LON 4112 7525 4115 7516 4114 7508 4109 7504
      4103 7505 4099 7513 4097 7513 4097 7512
      4094 7511 4091 7508 4085 7508 4084 7510
      4083 7509 4082 7509 4081 7544

$$

Cooper

Area Forecast Discussion
National Weather Service Mount Holly NJ
147 PM EDT Fri Aug 7 2026

.WHAT HAS CHANGED...
A Severe Thunderstorm Watch has been issued until 9 PM this
evening.

&&

.KEY MESSAGES...
1. Hot and very humid conditions are expected to persist
through Tuesday of next week. A Heat Advisory is in effect for
portions of the area.

2. There are daily chances for showers and thunderstorms
through tomorrow, as well as portions of next week. There is at
least a marginal risk each day for localized heavy rainfall
leading to flash flooding and locally damaging wind gusts with
any stronger thunderstorms that develop.

&&

.DISCUSSION...
KEY MESSAGE 1...Hot and very humid conditions are expected to
persist through Tuesday of next week. A Heat Advisory is in
effect for portions of the area.

A relatively stagnant synoptic pattern is developing across our
region. Quasi zonal mid and upper level flow will be in place
through the middle of next week as Bermuda high pressure
persists offshore. This will keep a steady stream of very warm
and moist air in place across the region through the period.

A prolonged period of hot and, most notably, very humid
conditions is expected to remain in place for the next several
days. We look to have a weak cold frontal passage early Sunday,
ushering in slightly drier air. This will give some slight
reprieve from the excessive humidity, though highs will still be
in the upper 80s to low 90s. Moisture advection will return
again by Monday though, and hot and very humid conditions are
anticipated to return Monday through Tuesday. A somewhat
stronger cold front looks to come through late Tuesday or
Wednesday, which will help break the excessive heat and humidity
some.

A Heat Advisory remains in effect for portions of eastern
Pennsylvania, much of New Jersey except the far southern
counties, as well as New Castle County, Delware. A portion of
the Heat Advisory for northern New Jersey and southeastern
Pennsylvania was extended through Saturday. This includes Morris
and Hunterdon Counties in NJ, and upper Bucks, western
Montgomery, and western Chester Counties in PA.

KEY MESSAGE 2...There are daily chances for showers and
thunderstorms through tomorrow, as well as portions of next
week. There is at least a marginal risk each day for localized
heavy rainfall leading to flash flooding and locally damaging
wind gusts with any stronger thunderstorms that develop.

A Severe Thunderstorm Watch has been issued until 9 PM this
evening. Diurnally driven instability will mostly be in the
1000-2000 J/kg each afternoon through the next several days
(except for Sunday) along with PWats in the 1.5-2" range. Mean
flow will be predominantly southwesterly and relatively weak
through Saturday. This will support a continued localized heavy
rainfall threat with potential for flash flooding, although
water loaded downdrafts could cause localized wind damage. Areas
with very saturated ground from recent rains will be most prone
to experiencing trees falling.

For late this afternoon and evening, a mid level shortwave
trough will approach the area, providing more forcing (as
compared to Thursday). As such, storm coverage is expected to
be more widespread, and storms should be more organized,
although bulk shear values are still relatively modest (up to 25
kts). Latest environmental parameters and CAMs indicate we
should see some scattered thunderstorms developing across
eastern PA by mid afternoon. Given the weak low level shear,
cold pool development should begin to propagate eastward fairly
quickly. This should ultimately support an MCS or two of sorts
developing and moving toward the I-95 corridor ahead of maximum
boundary layer thermodynamics. This will support damaging wind
gusts for a couple hours or so as this MCS(s) moves east.
Exactly where the greatest severe threat will be will depend on
where the early activity begins developing upstream. As the
activity moves east, a loss of diurnal heating and accelerating
cold pool cutting off inflow should cause storms to weaken
toward the coast. Forward motion of the storms should preclude a
significant flash flood threat, so we have not issued a Flood
Watch, however PWats of 2-2.25" will support very heavy rainfall
rates of 2-3" per hour. If these were to impact urbanized areas
for long enough, there could certainly be some flash flooding
concerns.

All of that said, the threat of severe thunderstorms today has
increased, and SPC has add a Slight Risk for damaging winds
along and northwest of I-95 (Marginal Risk elsewhere in the
forecast area). We remain in a Marginal Risk for excessive
rainfall from WPC.

Details for Saturday's convection remain unclear, but we could
certainly end up with some potential for flash flooding and
severe storms again. Current indications in the guidance support
a later timing of storms during the evening or even overnight
depending on the timing of a weak cold front and shortwave
trough. PWats look slightly lower than today, and mean flow is a
bit more westerly than southwesterly, but overall the
thermodynamics appear similar. There will be less forcing, so
convection probably won't be as widespread as today. We remain
in a Marginal Risk for excessive rainfall from WPC and general
thunder from SPC for Saturday.

We look to have a weak cold frontal passage by early Sunday,
ushering in slightly drier air. This combined with subtle
subsidence aloft will help briefly limit convection potential on
Sunday and also give some slight reprieve from the excessive
humidity, though highs will still be in the upper 80s to low
90s. Moisture and forcing aloft will return by Monday as mean
flow shifts more westerly and mid level flow increases. This
should result in a greater severe thunderstorm threat compared
to this week, and perhaps slightly lower flash flooding threat,
but the details into the period early next week remain unclear.
Long story short, Monday and Tuesday look to continue the hot
and humid conditions and daily thunderstorm chances.

A somewhat stronger cold front looks to come through late
Tuesday or Wednesday, which will help break the excessive heat
and humidity some, but the pattern aloft may still support
diurnally driven convection.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

This afternoon...VFR expected for most of the day. Scattered
showers and thunderstorms will develop late in the day,
primarily after 20-23Z from west to east. Southwest winds
generally between 5-10 kts, locally up to 15 kts. ,

Tonight...Primarily VFR expected, however restrictions are
possible at times prior to 04Z with any showers or
thunderstorms. Patchy fog possible late. Moderate confidence
overall.

Saturday...VFR. Scattered afternoon thunderstorms with MVFR
conditions.

Outlook...

Saturday night...Mostly VFR except lower conditions possible
with evening showers and thunderstorms.

Sunday-Sunday night...VFR conditions expected.

Monday-Tuesday...Mostly VFR except lower conditions possible
with afternoon/evening showers and thunderstorms.

Wednesday...VFR.

&&

.MARINE...
No prevailing marine hazards are expected through tonight.
Southerly winds increasing to 15-20 kts. Seas 2-4 feet. A line
of showers and thunderstorms may move offshore late in the
evening, with gusts of 30-40 kts and locally higher seas
possible.

Outlook...

Saturday-Tuesday...No prevailing marine hazards expected.
Thunderstorms possible Saturday night and Tuesday night.

Rip Currents...

For today...Southwest to south winds around 10-15 mph with
breaking waves in the surf zone of 1 to 3 feet. A medium period
east to southeast swell continues (dominant wave period of 5-7
seconds). Opted to go with a LOW risk for the development of
dangerous rip currents at all beaches.

For Saturday...Southwesterly winds continue and should increase
some to 10-20 mph. Breaking waves in the surf zone are forecast
to increase some, especially for much of the Jersey Shore, at 2
to 4 feet. Given the increasing surf and southerly winds, went
with a MODERATE risk for the development of dangerous rip
currents for the Jersey Shore. Breaking waves should be a little
lower still for the Delaware Beaches and coastal Monmouth
County, therefore went with a LOW risk for the development of
dangerous rip currents.

For specific beach forecasts, visit weather.gov/beach/phi

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT Saturday for PAZ070-071-101>106.
     Heat Advisory until 8 PM EDT this evening for PAZ060>062.
NJ...Heat Advisory until 8 PM EDT Saturday for NJZ008>010-012>015-
     017>020-027.
     Heat Advisory until 8 PM EDT this evening for NJZ001-007.
DE...Heat Advisory until 8 PM EDT Saturday for DEZ001.
MD...None.
MARINE...None.

&&

DISCUSSION...Guzzo/Johnson/Robertson/Staarmann
AVIATION...Franklin/Staarmann
MARINE...Gorse/Staarmann

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
507 AM EDT Fri Aug 7 2026

MDZ012-015-019-020-080915-
Kent MD-Queen Annes-Talbot-Caroline-
507 AM EDT Fri Aug 7 2026

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

There is a risk of severe thunderstorms late this afternoon and
evening, with potential for damaging winds and locally heavy
rainfall leading to flash flooding being the main threats.

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

Hot and very humid conditions will persist through Tuesday along
with daily chances for showers and thunderstorms. Any stronger
thunderstorms may produce locally damaging wind gusts and locally
heavy rainfall, which could lead to flash flooding.

.SPOTTER INFORMATION STATEMENT...

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

Staarmann