Severe Thunderstorm Warning 278, NWS Philadelphia/Mount Holly

587 
WWUS51 KPHI 071947
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
347 PM EDT Fri Aug 7 2026

NJC041-PAC011-025-077-089-095-072030-
/O.CON.KPHI.SV.W.0278.000000T0000Z-260807T2030Z/
Warren NJ-Berks PA-Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
347 PM EDT Fri Aug 7 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN WARREN...NORTHEASTERN BERKS...LEHIGH...SOUTHERN
CARBON...SOUTHWESTERN MONROE AND NORTHAMPTON COUNTIES...

At 347 PM EDT, a severe thunderstorm was located over Berlinsville,
or 8 miles southeast of Lehighton, moving northeast at 20 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Allentown, Easton, Lehighton, Bethlehem, Forks, Emmaus, Northampton,
Wilson, Hellertown, Nazareth, Palmerton, Bangor, Jim Thorpe,
Slatington, Pen Argyl, Nesquehoning, Wind Gap, Bath, Walnutport, and
Topton.

This includes the following highways...
 Northeast Extension between mile markers 50 and 86.
 Interstate 78 in Pennsylvania between mile markers 44 and 76.
 Interstate 80 in Pennsylvania between mile markers 296 and 299, and
near mile marker 305.
 Interstate 380 in Pennsylvania between mile markers 0 and 1.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 4109 7540 4086 7509 4062 7523 4044 7564
      4069 7585 4074 7576 4083 7590
TIME...MOT...LOC 1947Z 241DEG 18KT 4076 7557 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

841 
WWUS51 KPHI 071959
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
359 PM EDT Fri Aug 7 2026

PAC011-072008-
/O.CAN.KPHI.SV.W.0278.000000T0000Z-260807T2030Z/
Berks PA-
359 PM EDT Fri Aug 7 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BERKS COUNTY IS
CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.

LAT...LON 4086 7509 4062 7523 4050 7563 4055 7570
      4073 7577 4100 7529
TIME...MOT...LOC 1958Z 256DEG 26KT 4069 7550 

$$

NJC041-PAC025-077-089-095-072030-
/O.CON.KPHI.SV.W.0278.000000T0000Z-260807T2030Z/
Warren NJ-Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
359 PM EDT Fri Aug 7 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN WARREN...LEHIGH...SOUTHEASTERN CARBON...SOUTH
CENTRAL MONROE AND NORTHAMPTON COUNTIES...

At 358 PM EDT, a severe thunderstorm was located over Northampton, or
near Allentown, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
Hellertown, Nazareth, Palmerton, Bangor, Slatington, Pen Argyl, Wind
Gap, Bath, Walnutport, Belfast, West Easton, Tatamy, and East Bangor.

This includes the following highways...
 Northeast Extension between mile markers 53 and 72.
 Interstate 78 in Pennsylvania between mile markers 47 and 61, and
between mile markers 63 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 4086 7509 4062 7523 4050 7563 4055 7570
      4073 7577 4100 7529
TIME...MOT...LOC 1958Z 256DEG 26KT 4069 7550 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

461 
WWUS51 KPHI 072018
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
418 PM EDT Fri Aug 7 2026

PAC025-072028-
/O.CAN.KPHI.SV.W.0278.000000T0000Z-260807T2030Z/
Carbon PA-
418 PM EDT Fri Aug 7 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARBON COUNTY IS
CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.

LAT...LON 4086 7509 4062 7523 4050 7563 4097 7525
TIME...MOT...LOC 2018Z 260DEG 32KT 4074 7527 

$$

NJC041-PAC077-089-095-072030-
/O.CON.KPHI.SV.W.0278.000000T0000Z-260807T2030Z/
Warren NJ-Lehigh PA-Monroe PA-Northampton PA-
418 PM EDT Fri Aug 7 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN WARREN...SOUTHEASTERN LEHIGH...SOUTH CENTRAL MONROE
AND NORTHAMPTON COUNTIES...

At 418 PM EDT, a severe thunderstorm was located over Tatamy, or near
Easton, moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
Hellertown, Nazareth, Bangor, Pen Argyl, Wind Gap, Bath, Belfast,
West Easton, Tatamy, East Bangor, Steuben, Glendon, and Stormville.

This includes the following highways...
 Northeast Extension between mile markers 53 and 56.
 Interstate 78 in Pennsylvania between mile markers 55 and 61, and
between mile markers 63 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 4086 7509 4062 7523 4050 7563 4097 7525
TIME...MOT...LOC 2018Z 260DEG 32KT 4074 7527 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse

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