Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 33, NWS Philadelphia/Mount Holly

May 3, 2025Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 3, 2025, 9:50 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 17 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: May 3, 2025, 9:50 PM EDT (01:50 UTC)
Expired: May 3, 2025, 10:07 PM EDT
In force: 17 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 122 km from the middle of the area, began a volume at 01:52 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
May 3, 5:51 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.8 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.

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: 244 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1274 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

158 
WUUS51 KPHI 040150
SVRPHI
PAC011-029-040230-
/O.NEW.KPHI.SV.W.0033.250504T0150Z-250504T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
950 PM EDT Sat May 3 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Berks County in eastern Pennsylvania...
  Northwestern Chester County in southeastern Pennsylvania...

* Until 1030 PM EDT.

* At 950 PM EDT, a severe thunderstorm was located near Gap, or 12
  miles southeast of New Holland, moving northeast at 30 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...
  Elverson, Cochranville, Lorane, Birdsboro, Coatesville, South
  Pottstown, Glenmoore, New Morgan, Amity Gardens, Pughtown,
  Kenilworth, Honey Brook, Cedarville, Parkesburg, Atglen, South
  Coatesville, Stowe, Reiffton, and Pottstown.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 310.
 Interstate 176 in Pennsylvania between mile markers 1 and 5.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4004 7593 4011 7594 4014 7588 4019 7594
      4034 7583 4026 7568 4024 7569 4024 7564
      4020 7557 4020 7555 3986 7594 3988 7598
      3994 7598 3995 7600
TIME...MOT...LOC 0150Z 213DEG 28KT 3994 7599 

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

$$

Hoeflich

1 follow-up statement

527 
WWUS51 KPHI 040207
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1007 PM EDT Sat May 3 2025

PAC011-029-040217-
/O.CAN.KPHI.SV.W.0033.000000T0000Z-250504T0230Z/
Berks PA-Chester PA-
1007 PM EDT Sat May 3 2025

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS AND
NORTHWESTERN CHESTER 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.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
eastern and southeastern Pennsylvania.

LAT...LON 4004 7593 4011 7594 4014 7588 4019 7594
      4034 7583 4026 7568 4024 7569 4024 7564
      4020 7557 4020 7555 3986 7594 3988 7598
      3994 7598 3995 7600
TIME...MOT...LOC 0206Z 213DEG 28KT 4006 7589 

$$

Hoeflich

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 8:10 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	50 min
May 3, 8:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	43 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2025 Every severe thunderstorm warning in 2025

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.