Flood Watch 10, NWS Philadelphia/Mount Holly

Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

402 
WGUS61 KPHI 310820
FFAPHI

Flood Watch
National Weather Service Mount Holly NJ
420 AM EDT Thu Jul 31 2025

DEZ001-NJZ009-010-012-013-015>019-027-PAZ070-071-101>106-312100-
/O.CON.KPHI.FA.A.0010.250731T1800Z-250801T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-
Salem-Gloucester-Camden-Northwestern Burlington-Southeastern
Burlington-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Freehold, Collegeville, Mount Holly,
Flemington, Camden, Wilmington, Glassboro, New Brunswick, Wharton
State Forest, Kennett Square, Oxford, Trenton, Perkasie,
Pottstown, Philadelphia, Pennsville, Honey Brook, Lansdale,
Chalfont, Morrisville, Doylestown, West Chester, Cherry Hill,
Moorestown, Media, Somerville, and Norristown
420 AM EDT Thu Jul 31 2025

...FLOOD WATCH REMAINS IN EFFECT FROM 2 PM EDT THIS AFTERNOON 
THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be 
  possible.

* WHERE...Portions of northern Delaware, including the following 
  area, New Castle, New Jersey, including the following areas, 
  Camden, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern 
  Burlington, Salem, Somerset, Southeastern Burlington and Western 
  Monmouth, and southeast Pennsylvania, including the following 
  areas, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, 
  Philadelphia, Upper Bucks, Western Chester and Western Montgomery.

* WHEN...From 2 PM EDT this afternoon through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers, 
  creeks, streams, and other low-lying and flood-prone locations. 
  Creeks and streams may rise out of their banks. Flooding may occur 
  in poor drainage and urban areas. Storm drains and ditches may 
  become clogged with debris.

* ADDITIONAL DETAILS...
  - A very warm and humid airmass will be in place ahead of an
    approaching cold front, which will push across the region
    through tonight. Widespread showers and thunderstorms are
    expected to develop this afternoon into tonight, which will
    be capable of producing heavy rainfall. Forecast rainfall
    amounts of 1 to 3 inches can generally be expected, with
    localized amounts of 5 to 7 inches or greater possible.
    Rainfall rates may exceed 2 inches per hour.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued. Have multiple reliable ways 
to receive Flash Flood Warnings. If you encounter a flooded road, 
Turn Around, Don't Drown.

&&

$$

DEZ002>004-MDZ012-015-019-020-NJZ001-007-008-014-020>026-PAZ054-055-
060>062-312100-
/O.CON.KPHI.FA.A.0010.250731T1800Z-250801T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen Annes-Talbot-
Caroline-Sussex-Warren-Morris-Eastern Monmouth-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Easton, Washington, Newton, Centreville,
Allentown, Chestertown, Stroudsburg, Dover, Reading, Atlantic
City, Jackson, Cape May Court House, Georgetown, Jim Thorpe,
Ocean City, Morristown, Bethlehem, Hammonton, Millville, Denton,
Long Beach Island, Sandy Hook, and Rehoboth Beach
420 AM EDT Thu Jul 31 2025

...FLOOD WATCH REMAINS IN EFFECT FROM 2 PM EDT THIS AFTERNOON 
THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be 
  possible.

* WHERE...Portions of Delaware, including the following areas, 
  Delaware Beaches, Inland Sussex and Kent, northeast Maryland, 
  including the following areas, Caroline, Kent MD, Queen Annes and 
  Talbot, New Jersey, including the following areas, Atlantic, 
  Atlantic Coastal Cape May, Cape May, Coastal Atlantic, Coastal 
  Ocean, Cumberland, Eastern Monmouth, Morris, Ocean, Sussex and 
  Warren, and Pennsylvania, including the following areas, Berks, 
  Carbon, Lehigh, Monroe and Northampton.

* WHEN...From 2 PM EDT this afternoon through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers, 
  creeks, streams, and other low-lying and flood-prone locations. 
  Creeks and streams may rise out of their banks. Flooding may occur 
  in poor drainage and urban areas. Storm drains and ditches may 
  become clogged with debris.

* ADDITIONAL DETAILS...
  - A very warm and humid airmass will be in place ahead of an
    approaching cold front, which will push across the region
    through tonight. Widespread showers and thunderstorms are
    expected to develop this afternoon into tonight, which will
    be capable of producing heavy rainfall. Forecast rainfall
    amounts of 1 to 2 inches can generally be expected, with
    localized amounts of 3 to 5 inches possible. Rainfall rates
    may exceed 2 inches per hour.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued. Have multiple reliable ways 
to receive Flash Flood Warnings. If you encounter a flooded road, 
Turn Around, Don't Drown.

&&

$$

Staarmann

130 
WGUS61 KPHI 311058
FFAPHI

Flood Watch
National Weather Service Mount Holly NJ
658 AM EDT Thu Jul 31 2025

DEZ001-NJZ009-010-012-013-015>019-027-PAZ070-071-101>106-312300-
/O.CON.KPHI.FA.A.0010.250731T1800Z-250801T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-
Salem-Gloucester-Camden-Northwestern Burlington-Southeastern
Burlington-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Freehold, Collegeville, Mount Holly,
Flemington, Camden, Wilmington, Glassboro, New Brunswick, Wharton
State Forest, Kennett Square, Oxford, Trenton, Perkasie,
Pottstown, Philadelphia, Pennsville, Honey Brook, Lansdale,
Chalfont, Morrisville, Doylestown, West Chester, Cherry Hill,
Moorestown, Media, Somerville, and Norristown
658 AM EDT Thu Jul 31 2025

...FLOOD WATCH REMAINS IN EFFECT FROM 2 PM EDT THIS AFTERNOON 
THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be 
  possible.

* WHERE...Portions of northern Delaware, including the following 
  area, New Castle, New Jersey, including the following areas, 
  Camden, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern 
  Burlington, Salem, Somerset, Southeastern Burlington and Western 
  Monmouth, and southeast Pennsylvania, including the following 
  areas, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, 
  Philadelphia, Upper Bucks, Western Chester and Western Montgomery.

* WHEN...From 2 PM EDT this afternoon through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers, 
  creeks, streams, and other low-lying and flood-prone locations. 
  Creeks and streams may rise out of their banks. Flooding may occur 
  in poor drainage and urban areas. Storm drains and ditches may 
  become clogged with debris.

* ADDITIONAL DETAILS...
  - A very warm and humid airmass will be in place ahead of an
    approaching cold front, which will push across the region
    through tonight. Widespread showers and thunderstorms are
    expected to develop this afternoon into tonight, which will
    be capable of producing heavy rainfall. Forecast rainfall
    amounts of 1 to 3 inches can generally be expected, with
    localized amounts of 5 to 7 inches or greater possible.
    Rainfall rates may exceed 2 inches per hour. Significant
    flash flooding is possible.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued. Have multiple reliable ways 
to receive Flash Flood Warnings. If you encounter a flooded road, 
Turn Around, Don't Drown.

&&

$$

DEZ002>004-MDZ012-015-019-020-NJZ001-007-008-014-020>026-PAZ054-055-
060>062-312300-
/O.CON.KPHI.FA.A.0010.250731T1800Z-250801T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen Annes-Talbot-
Caroline-Sussex-Warren-Morris-Eastern Monmouth-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Easton, Washington, Newton, Centreville,
Allentown, Chestertown, Stroudsburg, Dover, Reading, Atlantic
City, Jackson, Cape May Court House, Georgetown, Jim Thorpe,
Ocean City, Morristown, Bethlehem, Hammonton, Millville, Denton,
Long Beach Island, Sandy Hook, and Rehoboth Beach
658 AM EDT Thu Jul 31 2025

...FLOOD WATCH REMAINS IN EFFECT FROM 2 PM EDT THIS AFTERNOON 
THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be 
  possible.

* WHERE...Portions of Delaware, including the following areas, 
  Delaware Beaches, Inland Sussex and Kent, northeast Maryland, 
  including the following areas, Caroline, Kent MD, Queen Annes and 
  Talbot, New Jersey, including the following areas, Atlantic, 
  Atlantic Coastal Cape May, Cape May, Coastal Atlantic, Coastal 
  Ocean, Cumberland, Eastern Monmouth, Morris, Ocean, Sussex and 
  Warren, and Pennsylvania, including the following areas, Berks, 
  Carbon, Lehigh, Monroe and Northampton.

* WHEN...From 2 PM EDT this afternoon through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers, 
  creeks, streams, and other low-lying and flood-prone locations. 
  Creeks and streams may rise out of their banks. Flooding may occur 
  in poor drainage and urban areas. Storm drains and ditches may 
  become clogged with debris.

* ADDITIONAL DETAILS...
  - A very warm and humid airmass will be in place ahead of an
    approaching cold front, which will push across the region
    through tonight. Widespread showers and thunderstorms are
    expected to develop this afternoon into tonight, which will
    be capable of producing heavy rainfall. Forecast rainfall
    amounts of 1 to 2 inches can generally be expected, with
    localized amounts of 3 to 5 inches possible. Rainfall rates
    may exceed 2 inches per hour.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued. Have multiple reliable ways 
to receive Flash Flood Warnings. If you encounter a flooded road, 
Turn Around, Don't Drown.

&&

$$

Staarmann

844 
WGUS61 KPHI 312244
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
644 PM EDT Thu Jul 31 2025

DEZ001-NJZ009-010-012-013-015>019-027-PAZ070-071-101>106-010400-
/O.EXT.KPHI.FA.A.0010.000000T0000Z-250801T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-
Salem-Gloucester-Camden-Northwestern Burlington-Southeastern
Burlington-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Morrisville, Glassboro, Chalfont, Cherry
Hill, Norristown, Philadelphia, Somerville, Kennett Square,
Flemington, Trenton, New Brunswick, Wharton State Forest,
Moorestown, Mount Holly, Doylestown, Wilmington, Oxford, West
Chester, Media, Perkasie, Collegeville, Honey Brook, Pennsville,
Lansdale, Freehold, Pottstown, and Camden
644 PM EDT Thu Jul 31 2025

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

* WHAT...Flash flooding caused by excessive rainfall continues to be 
  possible.

* WHERE...Portions of northern Delaware, including the following 
  area, New Castle, New Jersey, including the following areas, 
  Camden, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern 
  Burlington, Salem, Somerset, Southeastern Burlington and Western 
  Monmouth, and southeast Pennsylvania, including the following 
  areas, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, 
  Philadelphia, Upper Bucks, Western Chester and Western Montgomery.

* WHEN...Until midnight EDT tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers, 
  creeks, streams, and other low-lying and flood-prone locations. 
  Creeks and streams may rise out of their banks. Flooding may occur 
  in poor drainage and urban areas. Storm drains and ditches may 
  become clogged with debris.

* ADDITIONAL DETAILS...
  - A warm and humid airmass remains in place ahead of an
    approaching cold front, which will push across the region
    through tonight. Showers and thunderstorms through this
    evening will be capable of producing heavy rainfall.
    Additional rainfall amounts of up to 1 inch are possible,
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued.

&&

$$

DEZ002>004-MDZ012-015-019-020-NJZ001-007-008-014-020>026-PAZ054-055-
060>062-010400-
/O.EXT.KPHI.FA.A.0010.000000T0000Z-250801T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen Annes-Talbot-
Caroline-Sussex-Warren-Morris-Eastern Monmouth-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Washington, Stroudsburg, Jim Thorpe,
Allentown, Morristown, Hammonton, Denton, Chestertown, Bethlehem,
Long Beach Island, Millville, Cape May Court House, Jackson,
Atlantic City, Reading, Newton, Georgetown, Rehoboth Beach,
Dover, Ocean City, Easton, Centreville, and Sandy Hook
644 PM EDT Thu Jul 31 2025

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

* WHAT...Flash flooding caused by excessive rainfall continues to be 
  possible.

* WHERE...Portions of Delaware, including the following areas, 
  Delaware Beaches, Inland Sussex and Kent, northeast Maryland, 
  including the following areas, Caroline, Kent MD, Queen Annes and 
  Talbot, New Jersey, including the following areas, Atlantic, 
  Atlantic Coastal Cape May, Cape May, Coastal Atlantic, Coastal 
  Ocean, Cumberland, Eastern Monmouth, Morris, Ocean, Sussex and 
  Warren, and Pennsylvania, including the following areas, Berks, 
  Carbon, Lehigh, Monroe and Northampton.

* WHEN...Until midnight EDT tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers, 
  creeks, streams, and other low-lying and flood-prone locations. 
  Creeks and streams may rise out of their banks. Flooding may occur 
  in poor drainage and urban areas. Storm drains and ditches may 
  become clogged with debris.

* ADDITIONAL DETAILS...
  - A warm and humid airmass remains in place ahead of an
    approaching cold front, which will push across the region
    through tonight.  Showers and thunderstorms through this
    evening will be capable of producing heavy rainfall.
    Additional rainfall amounts of 1 to 3
    inches are possible,
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action 
should Flash Flood Warnings be issued.

&&

$$

MPS

334 
WGUS61 KPHI 010050
FFAPHI

Flood Watch
National Weather Service Mount Holly NJ
850 PM EDT Thu Jul 31 2025

DEZ001>004-MDZ012-015-019-020-NJZ001-007>010-012>027-PAZ054-055-
060>062-070-071-101>106-010200-
/O.CAN.KPHI.FA.A.0010.000000T0000Z-250801T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Kent-Inland Sussex-Delaware Beaches-Kent MD-Queen
Annes-Talbot-Caroline-Sussex-Warren-Morris-Hunterdon-Somerset-
Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Salem-
Gloucester-Camden-Northwestern Burlington-Ocean-Cumberland-
Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
Coastal Ocean-Southeastern Burlington-Carbon-Monroe-Berks-Lehigh-
Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Morrisville, Washington, Glassboro,
Chalfont, Cherry Hill, Norristown, Philadelphia, Stroudsburg,
Somerville, Jim Thorpe, Kennett Square, Flemington, Trenton,
Allentown, Morristown, Hammonton, New Brunswick, Denton,
Chestertown, Bethlehem, Wharton State Forest, Long Beach Island,
Millville, Moorestown, Cape May Court House, Jackson, Atlantic
City, Reading, Newton, Mount Holly, Doylestown, Georgetown,
Rehoboth Beach, Dover, Wilmington, Easton, Ocean City, Oxford,
West Chester, Media, Perkasie, Collegeville, Honey Brook,
Pennsville, Lansdale, Freehold, Pottstown, Centreville, Sandy
Hook, and Camden
850 PM EDT Thu Jul 31 2025

...FLOOD WATCH IS CANCELLED...

The Flash Flood Watch is cancelled for portions of Delaware, 
including the following areas, Delaware Beaches, Inland Sussex, Kent 
and New Castle, northeast Maryland, including the following areas, 
Caroline, Kent MD, Queen Annes and Talbot, New Jersey, including the 
following areas, Atlantic, Atlantic Coastal Cape May, Camden, Cape 
May, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, 
Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern 
Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, 
Warren and Western Monmouth, and Pennsylvania, including the 
following areas, Berks, Carbon, Delaware, Eastern Chester, Eastern 
Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, 
Upper Bucks, Western Chester and Western Montgomery.

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

$$

MPS

Area Forecast Discussion
National Weather Service Mount Holly NJ
1259 PM EDT Wed Jul 30 2025

.SYNOPSIS...
High pressure will begin to shift offshore through today, with
dangerously hot and humid conditions persisting. A slow moving
cold front will push through the region beginning late tonight
through Thursday night, bringing widespread showers and storms.
High pressure will then build from the north into the weekend,
with below normal temperatures, much drier and pleasant
conditions expected into early next week.

&&

.NEAR TERM /THROUGH TONIGHT/...
Very hot and humid conditions expected to continue today, along
with a chance for some isolated severe thunderstorms in eastern
PA and northern NJ. A Heat Advisory remains in effect for
portions of the area.

The ridging to our southwest will begin to weaken and shift
eastward today into tonight. The weak surface high pressure in
place across the area will also start pushing offshore, with
southwesterly return flow developing later today. The jet streak
to our north will also shift east, shifting us from an upper
subsidence to upper diffluence regime into tonight. Meanwhile, a
slow moving cold front is expected to sink southward into the
area overnight, reaching near the I-78 corridor by daybreak
Thursday.

There has been no significant change to the forecast regarding
today's heat and humidity. Forecast high temperatures are mostly
in the mid to upper 90s. Even the southern Poconos, higher
elevations of NW NJ, and the immediate coast should get into the
upper 80s to low 90s again today. The weak high pressure
shifting offshore will result in some modest southwesterly
return flow ahead of the cold front. This will keep the
dangerously hot and humid conditions in place. Resulting heat
indices remain in the 100-105 degree range. The Heat Advisory
remains in effect through 8 PM today as previously issued for
all counties where criteria is 100+. An expansion of the
advisory farther south was considered for our southern counties,
however the forecast currently supports heat indices remaining
largely below the 105 degree criteria.

The approaching front and lessening subsidence may allow for
some isolated thunderstorms to develop this afternoon and
evening, especially near/northwest of I-78. Coverage should be
limited (20-30% PoPs in the forecast), but any storms that do
develop could become severe with damaging winds being the main
threat. This will be due to fairly high DCAPE in place from
steep low level lapse rates and mid level dry air. Shear will be
modest around 20-30 kts, but any storms will become outflow
dominant very quickly and should be fairly transient and
disorganized in nature. A Marginal Risk (1/5) for damaging winds
remains in place from SPC.

Another very warm and humid night forecast tonight ahead of the
cold front with lows in the upper 60s to mid 70s. Some
scattered showers/storms could persist or redevelop overnight as
the front starts to push into the area from the north after
midnight. Some locally heavy rainfall could result, perhaps some
isolated amounts in the 1-2" range north of I-78. The greater
flash flood threat should hold off until the daytime Thursday
though.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY/...
Widespread showers and thunderstorms are forecast on Thursday,
which will pose a risk of flash flooding. Much cooler, breezy,
and showery conditions are expected to follow on Friday.

The ridging to our southwest will continue to shift eastward
through Thursday, with high pressure remaining offshore at the
surface. Broad upper diffluence will remain in place aloft
through Friday. Meanwhile, a slow moving cold front is expected
to push gradually southward Thursday through Thursday night.
This should result in some weak cyclogenesis in the Mid Atlantic
region as the front works its way south, with the surface low
passing offshore on Friday.

There remains a threat of flash flooding for Thursday afternoon
and evening, as widespread showers and thunderstorms are
anticipated to develop within the vicinity of the slow moving
frontal boundary. PoPs were remain near 70-80% for the entire
area, peaking from north to south as the front moves gradually
southward through Thursday night. As diurnal instability builds
ahead of the front into the afternoon, PWats will increase into
the 2.0-2.5 inch range. Mean layer flow will be roughly parallel
to the frontal boundary, which could support training
convection. The latest guidance has trended a bit faster with
the frontal and convective progression, which could limit a more
widespread flash flood potential. Cyclogensis nearby could also
introduce some frontogenetic forcing into the equation as well.
The synoptic aspects of this setup will probably lead to
convection continuing into the overnight period as well.

Exact details on the evolution of the convection and flash
flood threat remain unclear, as the mesoscale details remain to
be seen. Our current rainfall forecast ranges from around 1-2"
across the area, but locally higher amounts of 3" or greater are
certainly possible. The flash flood threat will ultimately
depend on where the heaviest rain sets up, and how quickly
convection is propagating. The higher threat for flash flooding
will probably end up being in the usual locations near and
northwest of I-95. WPC has maintained a Slight Risk of excessive
rainfall leading to flash flooding for the entire area. A few
isolated severe thunderstorms with damaging winds are possible
as well, but the main threat will be the flash flooding
potential. Remain alert for updates to the forecast regarding
these threats.

The silver lining with the frontal passage, increased cloud
cover, and convection will be lower temperatures Thursday,
especially for our NJ and PA counties. Forecast highs are mostly
in the 80s, and near 90 degrees in the Philly metro and south
into Delmarva. It will still be quite humid, especially ahead of
the front, but no heat headlines are expected.

By Friday, Thursday's frontal boundary should be south of the
forecast area as the weak surface low slides offshore along it.
Diffluence will remain in place aloft as Canadian high pressure
begins to build in from the north. This setup will result in
cloudy skies Friday along with an unusually breezy northeast
wind by mid summer standards. Lingering showers and drizzle can
also be expected, especially across the coastal plain. Northeast
winds 10-20 mph with gusts near 30 mph possible. High
temperatures Friday will be in the low to mid 70s, though some
cooler spots north of Philly could even be stuck in the upper
60s all day.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
The hot, humid, and stormy weather will fortunately by followed
by very pleasant and dry conditions over the weekend and into
early next week.

Drier air will finally start to work into the area from the
north Friday night and especially by Saturday as high pressure
takes hold of the region. Highs Saturday will be near 80 degrees
and dewpoints will be in the 50s, perhaps even mixing out into
the upper 40s in some spots. Low to mid 80s forecast for Sunday
through Tuesday high temperatures, though with similarly dry and
comfortable dewpoints and humidity levels. Lows in the period
will range from the mid 50s and 60s. About as perfect and nice
as mid summer weather gets!

&&

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

Rest of today...VFR. Low chance for a SHRA/TSRA to impact
KRDG/KABE/KTTN. Will carry VCTS at KRDG/KABE through late
afternoon. S-SW winds 5 to 10 kt. Low confidence on a SHRA/TSRA
passing directly over those northern terminals

Tonight...VFR. There is the potential for VSBY restrictions in
fog after 08Z. S-SW winds 5 to 10 kt, becoming LGT/VRB by 06Z.
Low confidence on fog formation late tonight.

Thursday...Any morning fog lifts and dissipates from 12Z-13Z.
VFR until 18Z, then sub-VFR in SHRA/TSRA. Potential for heavy
rain. SE to E winds 5 to 10 kt. Moderate confidence.

Outlook...

Thursday night...Ceiling and visibility restrictions likely.
Numerous showers and thunderstorms across the area.

Friday...Ceiling and visibility restrictions likely prevailing.
Periods of showers and drizzle. Gusty northeast winds.

Friday night through Sunday...Conditions improving to VFR. No
significant weather.

&&

.MARINE...
No marine hazards expected through tonight. South to southwest
winds 5-15 kts. Gusts near 20 kts possible this afternoon and
evening. Seas 1-2 feet.

Outlook...

Thursday and Thursday night...Winds and seas building, but
should remain below advisory criteria. Numerous showers and
thunderstorms.

Friday and Friday night...Advisory conditions likely. Gale
force wind gusts possible. Northeast winds 20-25 kts with gusts
30-35 kts possible. Scattered showers, storms, and drizzle.

Saturday...Conditions improving with lessening winds and seas,
though seas near 5 feet likely lingering into the night.

Sunday...Conditions should fall below advisory criteria.

Rip Currents...

For today, the surface winds will be more from the south and
southwest near 10 to 15 mph. Breaking waves in the surf zone
will continue to be 1 to 2 feet with a period around 8 seconds.
A LOW risk for the development of dangerous rip currents is
expected for all beaches.

For Thursday, winds will turn southeasterly near 10 to 15 mph.
Breakers will remain 1 to 2 feet with a period remaining around
8 seconds. A LOW risk for the development of dangerous rip
currents continues for all beaches.

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

&&

.CLIMATE...
Several days of high heat commenced Monday and will continue
through today. No records were reached Monday. Two record highs
(PHL/ACY) were tied on Tuesday, as well as a record warmest low
set at the AC Marina. Here's a rundown of record warmest high
and low temperatures for today.

Record Warmest High Temperatures
Site                Wednesday 7/30
AC Marina (55N)       99 in 2002
AC Airport (ACY)      96 in 2002
Allentown (ABE)       97 in 1940
Georgetown (GED)      99 in 1949
Mount Pocono (MPO)    90 in 1954
Philadelphia (PHL)    98 in 1988
Reading (RDG)         97 in 1940
Trenton (TTN)         98 in 1999
Wilmington (ILG)      97 in 1954

Record Warmest Low Temperatures
Site                Wednesday 7/30
AC Marina (55N)       79 in 2020
AC Airport (ACY)      76 in 2015
Allentown (ABE)       74 in 2024
Georgetown (GED)      78 in 2009
Mount Pocono (MPO)    68 in 1909
Philadelphia (PHL)    80 in 2002
Reading (RDG)         75 in 1933
Trenton (TTN)         78 in 1894
Wilmington (ILG)      75 in 2019

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Heat Advisory until 8 PM EDT this evening for PAZ054-055-
     060>062-070-071-101>106.
NJ...Heat Advisory until 8 PM EDT this evening for NJZ001-007>010-
     012>015-017>020-026-027.
DE...Heat Advisory until 8 PM EDT this evening for DEZ001.
MD...None.
MARINE...None.

&&

SYNOPSIS...Staarmann
NEAR TERM...Staarmann
SHORT TERM...Staarmann
LONG TERM...Staarmann
AVIATION...MPS/Staarmann
MARINE...Staarmann
CLIMATE...

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
720 AM EDT Wed Jul 30 2025

MDZ012-015-019-020-311130-
Kent MD-Queen Annes-Talbot-Caroline-
720 AM EDT Wed Jul 30 2025

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Isolated severe thunderstorms are possible Thursday afternoon and
evening. Scattered instances of flash flooding are possible Thursday
night.

.SPOTTER INFORMATION STATEMENT...

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

Staarmann