Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 152, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2025, 4:56 PM EDT for Chester County, Pennsylvania. It was in force for 19 min. 12 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, 4:56 PM EDT (20:56 UTC)
- Expired
- Jul 8, 2025, 5:15 PM EDT
- In force
- 19 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 103 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, 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, 5:03 PM EDT | TSTM WND DMG | Uwchlan Twp, PA | Trees and wires down. Time estimated from radar. |
| Jul 8, 5:05 PM EDT | TSTM WND DMG | 1 Wnw Upper Uwchlan Twp, PA | Pictures of widespread tree damage in Upper Uwchlan Township sent in by an EM. Time estimated from radar. |
| 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, 5:13 PM EDT | TSTM WND DMG | Malvern, PA | Large tree down. Time estimated from radar. |
| Jul 8, 5:13 PM EDT | TSTM WND DMG | Malvern, PA | Tree fell on occupied vehicle. No injuries. |
| Jul 8, 5:15 PM EDT | TSTM WND DMG | Schuylkill Twp, PA | Numerous trees down. Time estimated from radar. |
| Jul 8, 5:19 PM EDT | TSTM WND DMG | 1 Sse Chesterbrook, PA | Trees down in Tredyffrin twp. Time estimated from radar. |
| Jul 8, 5:19 PM EDT | TSTM WND DMG | Berwyn, PA | Trees and wired down. Time estimated from radar. |
| Jul 8, 5:24 PM EDT | HAIL 0.5 | 2 Se Upper Uwchlan Twp, PA | Report from mPING: Half-inch (0.50 in.). |
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 199 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
- 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
The text
As transmitted.
707
WUUS51 KPHI 082056
SVRPHI
PAC029-082115-
/O.NEW.KPHI.SV.W.0152.250708T2056Z-250708T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
456 PM EDT Tue Jul 8 2025
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Chester County in southeastern Pennsylvania...
* Until 515 PM EDT.
* At 456 PM EDT, a severe thunderstorm was located near Glenmoore, or
10 miles northwest of West Chester, moving northeast at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Phoenixville, Coatesville, Downingtown, Valley Forge, Glenmoore,
Paoli, Chester Springs, Lionville, Marshallton,
Lionville-Marchwood, Malvern, South Coatesville, Modena, Exton,
Thorndale, Chesterbrook, and Devon-Berwyn.
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4010 7581 4014 7551 4013 7550 4013 7546
4009 7545 4009 7542 4006 7539 3992 7575
4004 7592
TIME...MOT...LOC 2056Z 223DEG 31KT 4004 7577
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MJLThe 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, 4:54 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 51 min |
| Jul 8, 5:02 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Jul 8, 5:16 PM EDT | Severe Thunderstorm Warning | 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 | 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 | PHI | Bucks, Philadelphia | 49 min |
| Jul 8, 6:08 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 34 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.