Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 245, NWS Philadelphia/Mount Holly

July 27, 2026Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2026, 8:01 PM EDT for Chester County, Pennsylvania. It was in force for 23 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 27, 2026, 8:01 PM EDT (00:01 UTC)
Expired
Jul 27, 2026, 8:24 PM EDT
In force
23 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 00:03 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.0 hours before the alert went out and 178 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2026-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 593 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2026-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
593 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1608 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted.

551 
WUUS51 KPHI 280001
SVRPHI
PAC029-280045-
/O.NEW.KPHI.SV.W.0245.260728T0001Z-260728T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
801 PM EDT Mon Jul 27 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Chester County in southeastern Pennsylvania...

* Until 845 PM EDT.

* At 801 PM EDT, a severe thunderstorm was located over Coatesville,
  or 10 miles west of West Chester, 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...
  Coatesville, Downingtown, Kennett Square, Marshallton, South
  Coatesville, Avondale, Modena, Toughkenamon, and Thorndale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4001 7590 4007 7580 3991 7556 3978 7578
TIME...MOT...LOC 0001Z 316DEG 13KT 3997 7580 

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

$$

Guzzo
1 follow-up statement
698 
WWUS51 KPHI 280024
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
824 PM EDT Mon Jul 27 2026

PAC029-280034-
/O.CAN.KPHI.SV.W.0245.000000T0000Z-260728T0045Z/
Chester PA-
824 PM EDT Mon Jul 27 2026

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHESTER COUNTY 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.

LAT...LON 4001 7590 4007 7580 3991 7556 3978 7578
TIME...MOT...LOC 0021Z 316DEG 13KT 3991 7572 

$$

Guzzo

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 1:02 PM EDTFlash Flood WarningPHILehigh, Monroe, Northampton4 hr
Jul 28, 1:22 PM EDTSevere Thunderstorm WarningPHILehigh, Northampton38 min
Jul 28, 1:31 PM EDTSevere Thunderstorm WarningPHINorthampton44 min
Jul 28, 1:49 PM EDTTornado WarningPHIMonroe, Northampton26 min
Jul 28, 2:15 PM EDTSevere Thunderstorm WarningPHINorthampton45 min
Jul 28, 5:08 PM EDTSevere Thunderstorm WarningPHILehigh, Northampton15 min
Jul 28, 5:22 PM EDTSevere Thunderstorm WarningPHIBucks34 min
Jul 28, 5:29 PM EDTSevere Thunderstorm WarningPHIChester61 min
Jul 28, 5:47 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton43 min
Jul 28, 5:55 PM EDTFlash Flood WarningPHIBerks3 hr
Jul 28, 6:16 PM EDTTornado WarningPHIChester29 min
Jul 28, 6:17 PM EDTFlash Flood WarningPHIBucks, Lehigh, Northampton6 hr
Jul 28, 6:23 PM EDTSevere Thunderstorm WarningPHIChester, Delaware67 min
Jul 28, 6:46 PM EDTTornado WarningPHIDelaware29 min
Jul 28, 6:56 PM EDTFlash Flood WarningPHIBucks, Lehigh, Northampton5 hr
Jul 28, 7:06 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia54 min
Jul 28, 7:08 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery35 min
Jul 28, 7:11 PM EDTFlash Flood WarningPHIDelaware, Philadelphia3 hr
Jul 28, 7:24 PM EDTFlash Flood WarningPHIChester4 hr
Jul 28, 7:31 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton44 min
Jul 28, 7:55 PM EDTFlash Flood WarningPHIBucks, Montgomery4 hr

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