Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 151, NWS Philadelphia/Mount Holly

July 8, 2025Berks County, Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2025, 4:54 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 51 min. 17 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: Jul 8, 2025, 4:54 PM EDT (20:54 UTC)
Expired: Jul 8, 2025, 5:45 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Berks County, PA, Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 117 km from the middle of the area, began a volume at 20:55 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
Jul 8, 4:55 PM EDT	HAIL 0.5	Birdsboro, PA	Report from mPING: Half-inch (0.50 in.).
Jul 8, 4:58 PM EDT	HAIL 0.75	Stowe, PA	Report from mPING: Dime (0.75 in.).
Jul 8, 4:59 PM EDT	HAIL 1	Union Twp, PA	Relayed via social media. Time included with report.
Jul 8, 5:01 PM EDT	TSTM WND DMG	2 Ne Upper Uwchlan Twp, PA	Report and photos showing a large tree snapped and a shed completed destroyed by wind at a residence on Carriage Lane in West Vincent Twp. Time estimated from radar.
Jul 8, 5:02 PM EDT	TSTM WND GST 68	Pottstown, PA	Measured 68 mph gust in Pottstown. Time included in report.
Jul 8, 5:02 PM EDT	HAIL 1	Pottstown, PA	Quarter-size hail in Pottstown. Video sent via social media. Time included with report.
Jul 8, 5:05 PM EDT	TSTM WND DMG	Chester Springs, PA	Numerous trees down. Time estimated from radar.
Jul 8, 5:05 PM EDT	TSTM WND DMG	Glenmoore, PA	Images shared on social media show several trees downed and one building under construction damaged near the intersection of Fairview Rd and McKnight Farm Ln.
Jul 8, 5:10 PM EDT	TSTM WND DMG	Kimberton, PA	Trees and wires down. Time estimated from radar.
Jul 8, 5:10 PM EDT	TSTM WND DMG	Pottstown, PA	Damage to house shutters, trees down in Pottstown. Time estimated from radar.
Jul 8, 5:15 PM EDT	TSTM WND DMG	Pottstown, PA	Several trees and wires down around Pottstown and Pottsgrove. Time estimated from radar.
Jul 8, 5:15 PM EDT	TSTM WND DMG	Schuylkill Twp, PA	Numerous trees down. Time estimated from radar.
Jul 8, 5:17 PM EDT	TSTM WND GST 51	2 Ese Sanatoga, PA	ASOS station KPTW Pottstown.
Jul 8, 5:17 PM EDT	NON-TSTM WND GST 51	2 Ese Sanatoga, PA	ASOS station KPTW Pottstown.
Jul 8, 5:19 PM EDT	TSTM WND DMG	1 S Perkiomenville, PA	Trees and wires down. Time estimated from radar.
Jul 8, 5:22 PM EDT	TSTM WND DMG	1 Wnw Lower Frederick T, PA	Cluster of trees and wires down around Lower Frederick Township, PA. Time estimated from radar.
Jul 8, 5:30 PM EDT	HAIL 0.7	New Hanover Twp, PA	Dime-size hail report relayed on social media.

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
Jul 8, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 hours before the alert went out and 200 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: 695 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1207 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

518 
WUUS51 KPHI 082054
SVRPHI
PAC011-029-091-082145-
/O.NEW.KPHI.SV.W.0151.250708T2054Z-250708T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
454 PM EDT Tue Jul 8 2025

The National Weather Service in Mount Holly NJ has issued a

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

* Until 545 PM EDT.

* At 454 PM EDT, severe thunderstorms were located along a line
  extending from near Birdsboro to near Elverson, moving east at 25
  mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Pottstown, Phoenixville, Birdsboro, Collegeville, Royersford,
  Trappe, East Greenville, Honey Brook, Schwenksville, Elverson,
  Bally, Bechtelsville, Green Lane, New Morgan, Pughtown, Spring
  Mount, Glenmoore, Chester Springs, Geryville, and Gilbertsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with these storms. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

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

&&

LAT...LON 4013 7589 4014 7588 4015 7589 4035 7583
      4042 7548 4039 7543 4010 7546 4007 7592
TIME...MOT...LOC 2054Z 253DEG 23KT 4030 7575 4013 7580 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

MJL

2 follow-up statements

647 
WWUS51 KPHI 082113
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
513 PM EDT Tue Jul 8 2025

PAC011-029-091-082145-
/O.CON.KPHI.SV.W.0151.000000T0000Z-250708T2145Z/
Berks PA-Montgomery PA-Chester PA-
513 PM EDT Tue Jul 8 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND NORTHEASTERN
CHESTER COUNTIES...

At 513 PM EDT, severe thunderstorms were located along a line
extending from Gilbertsville to Pughtown, moving east at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Pottstown, Phoenixville, Collegeville, Royersford, Trappe, East
Greenville, Schwenksville, Bechtelsville, Green Lane, Pughtown,
Spring Mount, Chester Springs, Geryville, Gilbertsville, Cedarville,
Stowe, Boyertown, Pennsburg, Spring City, and Red Hill.

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 these storms.
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.

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

&&

LAT...LON 4024 7575 4034 7574 4042 7548 4039 7543
      4010 7546 4008 7576
TIME...MOT...LOC 2113Z 253DEG 23KT 4033 7562 4016 7567 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

MJL

499 
WWUS51 KPHI 082126
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
526 PM EDT Tue Jul 8 2025

PAC011-082136-
/O.CAN.KPHI.SV.W.0151.000000T0000Z-250708T2145Z/
Berks PA-
526 PM EDT Tue Jul 8 2025

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern and southeastern Pennsylvania.

LAT...LON 4037 7559 4038 7558 4042 7548 4039 7543
      4010 7546 4010 7560 4031 7564
TIME...MOT...LOC 2126Z 253DEG 23KT 4035 7552 4018 7557 

$$

PAC029-091-082145-
/O.CON.KPHI.SV.W.0151.000000T0000Z-250708T2145Z/
Montgomery PA-Chester PA-
526 PM EDT Tue Jul 8 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHWESTERN MONTGOMERY AND NORTHEASTERN CHESTER COUNTIES...

At 526 PM EDT, severe thunderstorms were located along a line
extending from near Green Lane to Royersford, moving east at 25 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Minor damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Pottstown, Phoenixville, Collegeville, Royersford, Trappe, East
Greenville, Schwenksville, Green Lane, Geryville, Spring Mount,
Gilbertsville, Pennsburg, Spring City, Red Hill, Pottsgrove,
Sanatoga, and Halfway House.

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 these storms.
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.

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

&&

LAT...LON 4037 7559 4038 7558 4042 7548 4039 7543
      4010 7546 4010 7560 4031 7564
TIME...MOT...LOC 2126Z 253DEG 23KT 4035 7552 4018 7557 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

MJL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 10:59 PM EDT	Flood Watch	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more	23 hr
Jul 8, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Berks	41 min
Jul 8, 3:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks	46 min
Jul 8, 4:05 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Jul 8, 4:20 PM EDT	Severe Thunderstorm Warning	PHI	Chester	40 min
Jul 8, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Berks	35 min
Jul 8, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	42 min
Jul 8, 4:39 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 8, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Chester	19 min
Jul 8, 5:02 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 8, 5:16 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	29 min
Jul 8, 5:19 PM EDT	Tornado Warning	PHI	Bucks, Montgomery	26 min
Jul 8, 5:20 PM EDT	Tornado Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	25 min
Jul 8, 5:31 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
Jul 8, 5:34 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Bucks, Delaware, Montgomery, Philadelphia	41 min
Jul 8, 5:45 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	4 hr
Jul 8, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	44 min
Jul 8, 5:52 PM EDT	Tornado Warning	PHI	Bucks, Montgomery, Philadelphia	13 min
Jul 8, 5:53 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery, Philadelphia	4 hr
Jul 8, 5:56 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Bucks, Philadelphia	49 min
Jul 8, 6:08 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.