Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 304, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 11, 2026, 4:48 PM EDT for Monroe County, Northampton County, Pennsylvania; Sussex County, Warren County, New Jersey. It was in force for 43 min. 3 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 11, 2026, 4:48 PM EDT (20:48 UTC)
- Expired
- Aug 11, 2026, 5:31 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 20:48 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 11, 4:57 PM EDT | TSTM WND DMG | Smithfield Twp, PA | Multiple reports of trees and wires down. Time estimated from radar. |
| Aug 11, 5:00 PM EDT | TSTM WND DMG | 2 Se Lake Monroe, PA | Multiple reports of trees and wires down in Middle Smithfield Township. Time estimated from radar. |
| Aug 11, 5:02 PM EDT | TSTM WND DMG | East Stroudsburg, PA | Multiple reports of trees and wires down. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.8 hours before the alert went out and 186 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
- 551 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 1095 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted.
647
WUUS51 KPHI 112048
SVRPHI
NJC037-041-PAC089-095-112145-
/O.NEW.KPHI.SV.W.0304.260811T2048Z-260811T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
448 PM EDT Tue Aug 11 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Sussex County in northwestern New Jersey...
Warren County in northwestern New Jersey...
Northeastern Monroe County in northeastern Pennsylvania...
Northeastern Northampton County in eastern Pennsylvania...
* Until 545 PM EDT.
* At 447 PM EDT, a severe thunderstorm was located over Analomink, or
10 miles southeast of Mount Pocono, moving southeast at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Newton, East Stroudsburg, Hackettstown, Blairstown, Oxford, Hope,
Andover, Henryville, Werry Lake, Greendell, Millbrook, Delaware
Water Gap, Tannersville, Alpine Mountain, Great Meadows-Vienna,
Flatbrookville, Allamuchy-Panther Valley, Analomink, Scotrun, and
Five Points.
This includes the following highways...
Interstate 80 in Pennsylvania between mile markers 300 and 304, and
between mile markers 306 and 314.
Interstate 80 in New Jersey between mile markers 0 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to damaging winds, frequent cloud to ground lightning is
occurring with this storm. Move indoors immediately. Remember, if
you can hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4117 7515 4115 7515 4114 7509 4108 7503
4112 7496 4102 7466 4075 7493 4106 7536
4118 7517
TIME...MOT...LOC 2047Z 293DEG 21KT 4105 7518
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse4 follow-up statements
637
WWUS51 KPHI 112103
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
503 PM EDT Tue Aug 11 2026
NJC037-041-PAC089-095-112145-
/O.CON.KPHI.SV.W.0304.000000T0000Z-260811T2145Z/
Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
503 PM EDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHWESTERN SUSSEX...WARREN...EAST CENTRAL MONROE AND
NORTHEASTERN NORTHAMPTON COUNTIES...
At 503 PM EDT, a severe thunderstorm was located near Echo Lake, or
15 miles southeast of Mount Pocono, moving east at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Newton, East Stroudsburg, Hackettstown, Blairstown, Oxford, Hope,
Andover, Werry Lake, Greendell, Millbrook, Delaware Water Gap, Great
Meadows-Vienna, Flatbrookville, Allamuchy-Panther Valley, Analomink,
Five Points, Columbia, Echo Lake, Lake Mohawk, and Beatyestown.
This includes the following highways...
Interstate 80 in Pennsylvania between mile markers 311 and 314.
Interstate 80 in New Jersey between mile markers 0 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4114 7509 4108 7503 4112 7496 4102 7466
4075 7493 4104 7526
TIME...MOT...LOC 2103Z 291DEG 15KT 4102 7509
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse953
WWUS51 KPHI 112115
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
515 PM EDT Tue Aug 11 2026
PAC095-112125-
/O.CAN.KPHI.SV.W.0304.000000T0000Z-260811T2145Z/
Northampton PA-
515 PM EDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NORTHAMPTON
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4108 7503 4110 7497 4099 7469 4088 7481
4075 7493 4100 7516 4111 7505
TIME...MOT...LOC 2115Z 296DEG 20KT 4099 7501
$$
NJC037-041-PAC089-112145-
/O.CON.KPHI.SV.W.0304.000000T0000Z-260811T2145Z/
Sussex NJ-Warren NJ-Monroe PA-
515 PM EDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHWESTERN SUSSEX...WARREN AND EAST CENTRAL MONROE COUNTIES...
At 515 PM EDT, a severe thunderstorm was located over Blairstown, or
14 miles west of Newton, moving southeast at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Hackettstown, Blairstown, Oxford, Hope, Andover, Great
Meadows-Vienna, Allamuchy-Panther Valley, Werry Lake, Greendell,
Millbrook, Delaware Water Gap, Echo Lake, Columbia, Beatyestown,
Shawnee, and Hidden Lake.
This includes the following highways...
Interstate 80 in Pennsylvania near mile marker 314.
Interstate 80 in New Jersey between mile markers 0 and 3, and
between mile markers 5 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4108 7503 4110 7497 4099 7469 4088 7481
4075 7493 4100 7516 4111 7505
TIME...MOT...LOC 2115Z 296DEG 20KT 4099 7501
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse942
WWUS51 KPHI 112123
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
523 PM EDT Tue Aug 11 2026
PAC089-112133-
/O.CAN.KPHI.SV.W.0304.000000T0000Z-260811T2145Z/
Monroe PA-
523 PM EDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONROE COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4098 7470 4082 7487 4097 7512 4103 7505
4104 7503 4105 7503 4108 7499 4109 7497
TIME...MOT...LOC 2123Z 298DEG 24KT 4094 7493
$$
NJC037-041-112145-
/O.CON.KPHI.SV.W.0304.000000T0000Z-260811T2145Z/
Sussex NJ-Warren NJ-
523 PM EDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHWESTERN SUSSEX AND NORTHERN WARREN COUNTIES...
At 523 PM EDT, a severe thunderstorm was located near Hope, or 11
miles southwest of Newton, moving southeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Hackettstown, Blairstown, Hope, Andover, Great Meadows-Vienna,
Allamuchy-Panther Valley, Greendell, Millbrook, and Beatyestown.
This includes Interstate 80 in New Jersey between mile markers 8 and
22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4098 7470 4082 7487 4097 7512 4103 7505
4104 7503 4105 7503 4108 7499 4109 7497
TIME...MOT...LOC 2123Z 298DEG 24KT 4094 7493
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse240
WWUS51 KPHI 112131
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
531 PM EDT Tue Aug 11 2026
NJC037-041-112141-
/O.CAN.KPHI.SV.W.0304.000000T0000Z-260811T2145Z/
Sussex NJ-Warren NJ-
531 PM EDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SUSSEX AND
NORTHERN WARREN COUNTIES IS CANCELLED...
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 has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 4098 7470 4082 7487 4097 7512 4103 7505
4104 7503 4105 7503 4108 7499 4109 7497
TIME...MOT...LOC 2130Z 293DEG 21KT 4092 7487
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 6:22 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 40 min |
| Aug 11, 3:23 AM EDT | Coastal Flood Advisory | PHI | Cape May, Cumberland, Salem | 23 hr |
| Aug 11, 4:56 PM EDT | Coastal Flood Advisory | PHI | Cape May, Cumberland, Salem | 33 hr |
| Aug 11, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 20 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2026Severe Thunderstorm Warnings in New Jersey, 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.