Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 35, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 6, 2025, 1:31 PM EDT for Chester County, Pennsylvania. It was in force for 44 min. 2 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
- May 6, 2025, 1:31 PM EDT (17:31 UTC)
- Expired
- May 6, 2025, 2:15 PM EDT
- In force
- 44 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), 118 km from the middle of the area, began a volume at 17:33 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 |
|---|---|---|---|
| May 6, 1:43 PM EDT | TSTM WND DMG | 2 W East Marlborough Tw, PA | Report of a large tree down blocking the roadway near the intersection of Upland Road and Byrd Road in Marlborough Twp. Time estimated from radar. |
| May 6, 2:05 PM EDT | HAIL 0.25 | Exton, PA | Pea sized hail. |
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 |
|---|---|---|---|
| May 6, 1:06 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.5 hours before the alert went out and 181 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.
- Mixed-layer CAPE
- 42 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 686 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
924
WUUS51 KPHI 061731
SVRPHI
PAC029-061815-
/O.NEW.KPHI.SV.W.0035.250506T1731Z-250506T1815Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
131 PM EDT Tue May 6 2025
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Chester County in southeastern Pennsylvania...
* Until 215 PM EDT.
* At 131 PM EDT, a severe thunderstorm was located over West Grove,
or 10 miles north of Newark, moving north 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...
Exton, Elverson, South Coatesville, Modena, Coatesville, Glenmoore,
Thorndale, West Grove, Landenberg, Chester Springs, Kennett Square,
Toughkenamon, Lionville, Marshallton, Avondale, Kemblesville,
Lionville-Marchwood, Downingtown, Phoenixville, and West Chester.
This includes Pennsylvania Turnpike between mile markers 300 and 319.
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 this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
LAT...LON 4014 7588 4017 7582 4013 7550 3973 7577
3972 7591
TIME...MOT...LOC 1731Z 195DEG 28KT 3982 7582
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann3 follow-up statements
660
WWUS51 KPHI 061746
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
146 PM EDT Tue May 6 2025
PAC029-061815-
/O.CON.KPHI.SV.W.0035.000000T0000Z-250506T1815Z/
Chester PA-
146 PM EDT Tue May 6 2025
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR CENTRAL CHESTER COUNTY...
At 146 PM EDT, a severe thunderstorm was located near Coatesville, or
9 miles west of West Chester, moving north at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Exton, Elverson, South Coatesville, Modena, Coatesville, Glenmoore,
Thorndale, West Grove, Chester Springs, Kennett Square, Toughkenamon,
Lionville, Marshallton, Avondale, Lionville-Marchwood, Downingtown,
Phoenixville, and West Chester.
This includes Pennsylvania Turnpike between mile markers 300 and 319.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4014 7588 4017 7582 4013 7550 3979 7574
3980 7587
TIME...MOT...LOC 1746Z 195DEG 28KT 3994 7578
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann000
WWUS51 KPHI 061800
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
200 PM EDT Tue May 6 2025
PAC029-061815-
/O.CON.KPHI.SV.W.0035.000000T0000Z-250506T1815Z/
Chester PA-
200 PM EDT Tue May 6 2025
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR CENTRAL CHESTER COUNTY...
At 200 PM EDT, a severe thunderstorm was located near Downingtown, or
9 miles northwest of West Chester, moving north 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...
Exton, Modena, Glenmoore, Thorndale, Chester Springs, Lionville,
Marshallton, Lionville-Marchwood, Downingtown, South Coatesville,
Phoenixville, Coatesville, and West Chester.
This includes Pennsylvania Turnpike between mile markers 302 and 319.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4017 7582 4013 7550 3993 7564 3996 7581
TIME...MOT...LOC 1800Z 195DEG 28KT 4004 7574
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann137 WWUS51 KPHI 061809 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 209 PM EDT Tue May 6 2025 PAC029-061819- /O.EXP.KPHI.SV.W.0035.000000T0000Z-250506T1815Z/ Chester PA- 209 PM EDT Tue May 6 2025 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CHESTER COUNTY WILL EXPIRE AT 215 PM EDT... The storm which prompted the warning has weakened below severe limits, and no longer poses an immediate threat to life or property. Therefore, the warning will be allowed to expire. However small hail, gusty winds, and heavy rain are still possible with this thunderstorm. A Severe Thunderstorm Watch remains in effect until 800 PM EDT for southeastern Pennsylvania. To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service Mount Holly NJ. LAT...LON 4017 7582 4013 7550 3993 7564 3996 7581 TIME...MOT...LOC 1809Z 195DEG 28KT 4010 7572 $$ Staarmann
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 1:08 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 37 min |
| May 6, 2:12 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 48 min |
| May 6, 2:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 59 min |
| May 6, 3:41 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 49 min |
| May 6, 3:57 PM EDT | Tornado Warning | PHI | Monroe, Northampton | 33 min |
| May 6, 4:18 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 57 min |
| May 6, 4:19 PM EDT | Tornado Warning | PHI | Monroe | 26 min |
| May 6, 4:31 PM EDT | Tornado Warning | PHI | Monroe | 44 min |
| May 6, 4:44 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 46 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2025Every 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.