Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 252, NWS Philadelphia/Mount Holly

July 28, 2026Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2026, 5:08 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 15 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 28, 2026, 5:08 PM EDT (21:08 UTC)
Expired: Jul 28, 2026, 5:23 PM EDT
In force: 15 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 21:10 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 28, 12:51 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.1 hours before the alert went out and 210 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: 1266 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

592 
WUUS51 KPHI 282108
SVRPHI
PAC077-095-282200-
/O.NEW.KPHI.SV.W.0252.260728T2108Z-260728T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
508 PM EDT Tue Jul 28 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Lehigh County in eastern Pennsylvania...
  Southwestern Northampton County in eastern Pennsylvania...

* Until 600 PM EDT.

* At 507 PM EDT, a severe thunderstorm was located over Allentown,
  moving northeast 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...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
  Hellertown, Nazareth, Bath, West Easton, Steuben, Glendon, Lehigh
  University, Beersville, Old Orchard, Phillipsburg, Catasauqua,
  Fountain Hill, and Coplay.

This includes the following highways...
 Northeast Extension between mile markers 55 and 60.
 Interstate 78 in Pennsylvania between mile markers 53 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4070 7520 4068 7519 4049 7543 4060 7561
      4082 7544
TIME...MOT...LOC 2107Z 218DEG 14KT 4061 7547 

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

$$

MJL

1 follow-up statement

264 
WWUS51 KPHI 282123
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
523 PM EDT Tue Jul 28 2026

PAC077-095-282133-
/O.CAN.KPHI.SV.W.0252.000000T0000Z-260728T2200Z/
Lehigh PA-Northampton PA-
523 PM EDT Tue Jul 28 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LEHIGH AND
SOUTHWESTERN NORTHAMPTON COUNTIES IS CANCELLED...

The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However heavy rain is still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northwestern New Jersey...and 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 4070 7520 4068 7519 4049 7543 4060 7561
      4082 7544
TIME...MOT...LOC 2120Z 218DEG 14KT 4066 7542 

$$

MJL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 8:01 PM EDT	Severe Thunderstorm Warning	PHI	Chester	23 min
Jul 28, 1:02 PM EDT	Flash Flood Warning	PHI	Lehigh, Monroe, Northampton	4 hr
Jul 28, 1:22 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	38 min
Jul 28, 1:31 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	44 min
Jul 28, 1:49 PM EDT	Tornado Warning	PHI	Monroe, Northampton	26 min
Jul 28, 2:15 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	45 min
Jul 28, 5:22 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	34 min
Jul 28, 5:29 PM EDT	Severe Thunderstorm Warning	PHI	Chester	61 min
Jul 28, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	43 min
Jul 28, 5:55 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Jul 28, 6:16 PM EDT	Tornado Warning	PHI	Chester	29 min
Jul 28, 6:17 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Northampton	6 hr
Jul 28, 6:23 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	67 min
Jul 28, 6:46 PM EDT	Tornado Warning	PHI	Delaware	29 min
Jul 28, 6:56 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Northampton	5 hr
Jul 28, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	54 min
Jul 28, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	35 min
Jul 28, 7:11 PM EDT	Flash Flood Warning	PHI	Delaware, Philadelphia	3 hr
Jul 28, 7:24 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 28, 7:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	44 min
Jul 28, 7:55 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	4 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.