Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 43, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 16, 2025, 11:22 AM EDT for 4 counties in Pennsylvania. It was in force for 53 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 16, 2025, 11:22 AM EDT (15:22 UTC)
- Expired
- May 16, 2025, 12:15 PM EDT
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bucks County, PA, Chester County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 15:21 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 16, 12:05 PM EDT | TSTM WND DMG | 1 N Shawmont - Philadel, PA | Several large trees down in the Andorra part of Philadelphia. Time estimated from radar. |
| May 16, 12:06 PM EDT | TSTM WND DMG | Philadelphia, PA | Telephone pole into a roof. Time estimated from radar. |
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 16, 10:06 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 3.4 hours before the alert went out and 210 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 572 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
742
WUUS51 KPHI 161522
SVRPHI
PAC017-029-091-101-161615-
/O.NEW.KPHI.SV.W.0043.250516T1522Z-250516T1615Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1122 AM EDT Fri May 16 2025
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
Northern Philadelphia County in southeastern Pennsylvania...
* Until 1215 PM EDT.
* At 1122 AM EDT, a severe thunderstorm was located near Spring
Mount, or 21 miles east of Reading, moving east at 35 mph. This
storm has a history of producing wind damage in Berks County.
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...
Philadelphia, Bensalem, Norristown, Pottstown, Phoenixville,
Lansdale, West Norriton, East Norriton, Perkasie, Doylestown,
Conshohocken, Palmyra, Hatboro, Souderton, Ambler, Collegeville,
Royersford, Jenkintown, Chalfont, and Trappe.
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 4027 7568 4043 7554 4035 7494 4033 7494
4032 7490 4027 7485 4014 7486 3998 7508
4022 7570
TIME...MOT...LOC 1522Z 284DEG 31KT 4028 7553
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
Staarmann3 follow-up statements
132
WWUS51 KPHI 161539
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1139 AM EDT Fri May 16 2025
PAC029-161549-
/O.CAN.KPHI.SV.W.0043.000000T0000Z-250516T1615Z/
Chester PA-
1139 AM EDT Fri May 16 2025
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 500 PM EDT for
southern and central New Jersey...and southeastern Pennsylvania.
LAT...LON 4026 7547 4036 7542 4033 7494 4032 7490
4027 7485 4014 7486 3998 7508 4015 7550
TIME...MOT...LOC 1539Z 284DEG 31KT 4025 7536
$$
PAC017-091-101-161615-
/O.CON.KPHI.SV.W.0043.000000T0000Z-250516T1615Z/
Montgomery PA-Bucks PA-Philadelphia PA-
1139 AM EDT Fri May 16 2025
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM EDT
FOR MONTGOMERY...SOUTHERN BUCKS AND NORTHERN PHILADELPHIA COUNTIES...
At 1139 AM EDT, a severe thunderstorm was located near Hatfield, or
20 miles northwest of Philadelphia, moving east at 35 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...
Philadelphia, Bensalem, Norristown, Lansdale, West Norriton, East
Norriton, Doylestown, Conshohocken, Palmyra, Hatboro, Souderton,
Ambler, Collegeville, Jenkintown, Chalfont, Trappe, Hatfield,
Rockledge, Newtown, and Abington.
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4026 7547 4036 7542 4033 7494 4032 7490
4027 7485 4014 7486 3998 7508 4015 7550
TIME...MOT...LOC 1539Z 284DEG 31KT 4025 7536
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann502
WWUS51 KPHI 161555
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1155 AM EDT Fri May 16 2025
PAC017-091-101-161615-
/O.CON.KPHI.SV.W.0043.000000T0000Z-250516T1615Z/
Montgomery PA-Bucks PA-Philadelphia PA-
1155 AM EDT Fri May 16 2025
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM EDT
FOR SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS AND NORTHERN
PHILADELPHIA COUNTIES...
At 1154 AM EDT, a severe thunderstorm was located near Lansdale, or
14 miles northwest of Philadelphia, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Bensalem, Norristown, Lansdale, West Norriton, East
Norriton, Doylestown, Conshohocken, Palmyra, Hatboro, Ambler,
Collegeville, Jenkintown, Chalfont, Hatfield, Rockledge, Newtown,
Abington, Langhorne, and Bryn Athyn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4024 7535 4034 7527 4032 7490 4027 7485
4014 7486 3998 7508 4015 7550
TIME...MOT...LOC 1554Z 287DEG 28KT 4020 7525
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann332
WWUS51 KPHI 161608
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1208 PM EDT Fri May 16 2025
PAC017-091-101-161617-
/O.EXP.KPHI.SV.W.0043.000000T0000Z-250516T1615Z/
Montgomery PA-Bucks PA-Philadelphia PA-
1208 PM EDT Fri May 16 2025
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS AND NORTHERN PHILADELPHIA COUNTIES WILL EXPIRE AT
1215 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 gusty
winds and heavy rainfall leading to flash flooding are still
possible with this thunderstorm. A Flash Flood Warning remains in
effect until 330 PM EDT for portions of this area.
A Severe Thunderstorm Watch remains in effect until 500 PM EDT for
southern and central New Jersey...and 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 4024 7535 4034 7527 4032 7490 4027 7485
4014 7486 3998 7508 4015 7550
TIME...MOT...LOC 1607Z 284DEG 31KT 4018 7513
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 9:34 PM EDT | Dense Fog Advisory | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 12 hr |
| May 16, 10:24 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more | 66 min |
| May 16, 11:16 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 59 min |
| May 16, 11:32 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| May 16, 11:41 AM EDT | Flash Flood Warning | PHI | Chester, Delaware | 4 hr |
| May 16, 12:20 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 40 min |
| May 16, 12:21 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
| May 16, 2:02 PM EDT | River Flood Warning | PHI | Chester | 5 hr |
| May 16, 3:29 PM EDT | Areal Flood Warning | PHI | Berks | 6 hr |
| May 16, 3:53 PM EDT | Areal Flood Warning | PHI | Montgomery | 100 min |
| May 16, 4:42 PM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 4 hr |
| May 16, 5:15 PM EDT | Areal Flood Warning | PHI | Bucks | 112 min |
| May 16, 6:43 PM EDT | Areal Flood Warning | PHI | Philadelphia | 113 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.