Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 296, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 10, 2026, 3:50 PM EDT for Carbon County, Lehigh County, Northampton County, Pennsylvania. It was in force for 40 min. 1 report 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 10, 2026, 3:50 PM EDT (19:50 UTC)
- Expired
- Aug 10, 2026, 4:30 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Carbon County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 137 km from the middle of the area, began a volume at 19:53 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 10, 3:55 PM EDT | TSTM WND DMG | Moore Twp, PA | Trees down in Moore Township. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 10, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 7.8 hours before the alert went out and 236 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1516 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
078
WUUS51 KPHI 101950
SVRPHI
PAC025-077-095-102030-
/O.NEW.KPHI.SV.W.0296.260810T1950Z-260810T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
350 PM EDT Mon Aug 10 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Lehigh County in eastern Pennsylvania...
Southeastern Carbon County in northeastern Pennsylvania...
Central Northampton County in eastern Pennsylvania...
* Until 430 PM EDT.
* At 350 PM EDT, a severe thunderstorm was located over Jordan
Valley, or 7 miles south of Lehighton, moving east at 35 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, Lehighton, Bethlehem, Emmaus, Northampton, Nazareth,
Palmerton, Slatington, Bath, Walnutport, Belfast, Tatamy, Steuben,
Neffs, Coffeetown, New Tripoli, Berlinsville, Ancient Oaks,
Emerald, and Lehigh University.
This includes the following highways...
Northeast Extension between mile markers 49 and 75.
Interstate 78 in Pennsylvania between mile markers 46 and 67.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4069 7587 4070 7583 4074 7576 4077 7581
4084 7576 4082 7548 4081 7547 4082 7547
4080 7518 4048 7544 4061 7580 4067 7588
TIME...MOT...LOC 1950Z 281DEG 29KT 4073 7576
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS2 follow-up statements
094
WWUS51 KPHI 102014
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
414 PM EDT Mon Aug 10 2026
PAC025-102024-
/O.CAN.KPHI.SV.W.0296.000000T0000Z-260810T2030Z/
Carbon PA-
414 PM EDT Mon Aug 10 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARBON COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern and northeastern Pennsylvania.
LAT...LON 4079 7520 4076 7521 4055 7538 4061 7564
4079 7560 4080 7558
TIME...MOT...LOC 2014Z 279DEG 27KT 4070 7553
$$
PAC077-095-102030-
/O.CON.KPHI.SV.W.0296.000000T0000Z-260810T2030Z/
Lehigh PA-Northampton PA-
414 PM EDT Mon Aug 10 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHEASTERN LEHIGH AND CENTRAL NORTHAMPTON COUNTIES...
At 414 PM EDT, a severe thunderstorm was located over Northampton, or
8 miles northwest of Allentown, moving east at 30 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, Bethlehem, Northampton, Nazareth, Slatington, Bath,
Walnutport, Belfast, Tatamy, Steuben, Neffs, Coffeetown,
Berlinsville, Lehigh University, Danielsville, Beersville,
Schnecksville, Catasauqua, Fountain Hill, and Coplay.
This includes the following highways...
Northeast Extension between mile markers 58 and 65.
Interstate 78 in Pennsylvania between mile markers 63 and 67.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4079 7520 4076 7521 4055 7538 4061 7564
4079 7560 4080 7558
TIME...MOT...LOC 2014Z 279DEG 27KT 4070 7553
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS353
WWUS51 KPHI 102024
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
424 PM EDT Mon Aug 10 2026
PAC077-095-102034-
/O.EXP.KPHI.SV.W.0296.000000T0000Z-260810T2030Z/
Lehigh PA-Northampton PA-
424 PM EDT Mon Aug 10 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEHIGH AND
CENTRAL NORTHAMPTON COUNTIES WILL EXPIRE AT 430 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern and northeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4079 7520 4076 7521 4055 7538 4061 7564
4079 7560 4080 7558
TIME...MOT...LOC 2024Z 281DEG 29KT 4069 7545
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 3:21 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 39 min |
| Aug 10, 4:02 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 43 min |
| Aug 10, 4:46 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 20 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2026Every severe thunderstorm warning in 2026
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.