Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 340, NWS Philadelphia/Mount Holly

September 1, 2026Carbon County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 1, 2026, 5:50 PM EDT for Carbon County, Lehigh County, Northampton County, Pennsylvania. It was in force for 40 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: Sep 1, 2026, 5:50 PM EDT (21:50 UTC)
Expired: Sep 1, 2026, 6:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Binghamton radar (KBGM), 140 km from the middle of the area, began a volume at 21:51 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
Sep 1, 6:25 PM EDT	TSTM WND GST 60	Jim Thorpe, PA	Trained spotter reported estimated 50 to 60 mph winds with pea size hail at time of report.
Sep 1, 6:35 PM EDT	TSTM WND DMG	Mahoning Twp, PA	Tree down in Mahoning Township. Time estimated from radar.
Sep 1, 6:40 PM EDT	TSTM WND DMG	East Penn Twp, PA	Tree down in East Penn 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
Sep 1, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.8 hours before the alert went out and 241 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 17 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 481 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

008 
WUUS51 KPHI 012150
SVRPHI
PAC025-077-095-012230-
/O.NEW.KPHI.SV.W.0340.260901T2150Z-260901T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
550 PM EDT Tue Sep 1 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Lehigh County in eastern Pennsylvania...
  Eastern Carbon County in northeastern Pennsylvania...
  Western Northampton County in eastern Pennsylvania...

* Until 630 PM EDT.

* At 550 PM EDT, a severe thunderstorm was located over Weatherly, or
  9 miles east of Hazleton, moving southeast at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Lehighton, Palmerton, Jim Thorpe, Slatington, Nesquehoning,
  Weatherly, Danielsville, Beltzville State Park, Christmans,
  Bowmanstown, Parryville, Weissport, and Weissport East.

This includes the following highways...
 Northeast Extension between mile markers 70 and 85.
 Interstate 80 in Pennsylvania between mile markers 277 and 279.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4080 7550 4073 7576 4095 7588 4098 7582
      4098 7580 4101 7573 4103 7574 4103 7575
      4105 7577 4107 7577 4108 7574
TIME...MOT...LOC 2150Z 333DEG 14KT 4097 7580 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DeSilva

1 follow-up statement

323 
WWUS51 KPHI 012213
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
613 PM EDT Tue Sep 1 2026

PAC025-077-095-012230-
/O.CON.KPHI.SV.W.0340.000000T0000Z-260901T2230Z/
Lehigh PA-Carbon PA-Northampton PA-
613 PM EDT Tue Sep 1 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHWESTERN LEHIGH...SOUTHEASTERN CARBON AND WESTERN NORTHAMPTON
COUNTIES...

At 613 PM EDT, a severe thunderstorm was located over Jim Thorpe, or
near Lehighton, moving southeast at 15 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Lehighton, Palmerton, Jim Thorpe, Slatington, Nesquehoning,
Weatherly, Danielsville, Beltzville State Park, Christmans,
Bowmanstown, Parryville, Weissport, and Weissport East.

This includes Northeast Extension between mile markers 70 and 85.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4080 7550 4073 7576 4095 7588 4098 7582
      4098 7580 4102 7569
TIME...MOT...LOC 2213Z 328DEG 15KT 4090 7576 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DeSilva

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 1, 2:30 AM EDT	Heat Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	18 hr
Sep 1, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	45 min
Sep 1, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks	51 min
Sep 1, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks	39 min
Sep 1, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Northampton	46 min
Sep 1, 6:38 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Sep 1, 6:56 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	49 min
Sep 1, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Berks	34 min
Sep 1, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Lehigh, Montgomery	47 min
Sep 1, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware	47 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2026 Every 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.