Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 129, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 27, 2023, 3:57 PM EDT for 4 counties in Pennsylvania. It was in force for 48 min. 4 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
- Jun 27, 2023, 3:57 PM EDT (19:57 UTC)
- Expired
- Jun 27, 2023, 4:45 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 20:00 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 |
|---|---|---|---|
| Jun 27, 4:15 PM EDT | TSTM WND GST 49 | 1 Wsw Ambler, PA | KLOM Wings Field. |
| Jun 27, 4:15 PM EDT | TSTM WND GST 49 | 1 Wsw Ambler, PA | KLOM Wings Field. |
| Jun 27, 4:38 PM EDT | TSTM WND DMG | Northeast Philadelphia, PA | Trees down throughout north and northeast Philadelphia. Time estimated on radar. |
| Jun 27, 4:38 PM EDT | TSTM WND DMG | Northeast Philadelphia, PA | Trees down throughout north and northeast Philadelphia. Time estimated on radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.0 hours before the alert went out and 218 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
- 17 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 793 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
015
WUUS51 KPHI 271957
SVRPHI
PAC029-045-091-101-272045-
/O.NEW.KPHI.SV.W.0129.230627T1957Z-230627T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
357 PM EDT Tue Jun 27 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Montgomery County in southeastern Pennsylvania...
East central Chester County in southeastern Pennsylvania...
Northern Philadelphia County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
* Until 445 PM EDT.
* At 357 PM EDT, a severe thunderstorm was located over Norristown,
or 14 miles northwest of Philadelphia, moving east at 25 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, Norristown, Lansdale, West Norriton, East Norriton,
Conshohocken, Hatboro, Ambler, Collegeville, Jenkintown, Narberth,
Rockledge, Abington, Bryn Athyn, Willow Grove, Germantown,
Northeast Philadelphia, Bryn Mawr, Trout Lake and Radnor Township.
This includes the following highways...
Pennsylvania Turnpike between mile markers 325 and 345.
Northeast Extension between mile markers 21 and 29.
Interstate 76 in Pennsylvania between mile markers 327 and 338.
Interstate 476 in Pennsylvania between mile markers 10 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4016 7549 4028 7525 4009 7495 4007 7497
3998 7539
TIME...MOT...LOC 1957Z 248DEG 21KT 4011 7536
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS3 follow-up statements
574
WWUS51 KPHI 272009
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
409 PM EDT Tue Jun 27 2023
PAC029-045-272019-
/O.CAN.KPHI.SV.W.0129.000000T0000Z-230627T2045Z/
Chester PA-Delaware PA-
409 PM EDT Tue Jun 27 2023
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CHESTER AND
NORTHEASTERN DELAWARE COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4004 7534 4019 7542 4026 7521 4009 7495
4007 7497 4006 7500
TIME...MOT...LOC 2009Z 255DEG 18KT 4013 7530
$$
PAC091-101-272045-
/O.CON.KPHI.SV.W.0129.000000T0000Z-230627T2045Z/
Montgomery PA-Philadelphia PA-
409 PM EDT Tue Jun 27 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN MONTGOMERY AND NORTHERN PHILADELPHIA COUNTIES...
At 409 PM EDT, a severe thunderstorm was located over Plymouth
Meeting, or 12 miles northwest of Philadelphia, moving east at 20
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, Norristown, Lansdale, West Norriton, East Norriton,
Conshohocken, Hatboro, Ambler, Jenkintown, Rockledge, Abington, Bryn
Athyn, Willow Grove, Northeast Philadelphia, Plymouth Meeting,
Chestnut Hill, Andalusia, King Of Prussia, Horsham and Bridgeport.
This includes the following highways...
Pennsylvania Turnpike between mile markers 329 and 346.
Northeast Extension between mile markers 21 and 27.
Interstate 76 in Pennsylvania between mile markers 330 and 335.
Interstate 476 in Pennsylvania between mile markers 15 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4004 7534 4019 7542 4026 7521 4009 7495
4007 7497 4006 7500
TIME...MOT...LOC 2009Z 255DEG 18KT 4013 7530
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS645
WWUS51 KPHI 272027
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
427 PM EDT Tue Jun 27 2023
PAC091-101-272045-
/O.CON.KPHI.SV.W.0129.000000T0000Z-230627T2045Z/
Montgomery PA-Philadelphia PA-
427 PM EDT Tue Jun 27 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN MONTGOMERY AND NORTHERN PHILADELPHIA COUNTIES...
At 426 PM EDT, a severe thunderstorm was located over Willow Grove,
or 10 miles north of Philadelphia, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, Hatboro, Ambler, Jenkintown, Rockledge, Abington, Bryn
Athyn, Willow Grove, Andalusia, Northeast Philadelphia, Chestnut
Hill, Horsham, North Wales, Fort Washington, Maple Glen, Glenside,
Flourtown, Spring House, Oreland and Wyndmoor.
This includes Pennsylvania Turnpike between mile markers 336 and 346.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4005 7522 4022 7528 4025 7519 4009 7495
4007 7497 4006 7499 4006 7507
TIME...MOT...LOC 2026Z 254DEG 23KT 4015 7516
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS187
WWUS51 KPHI 272038
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
438 PM EDT Tue Jun 27 2023
PAC091-101-272047-
/O.EXP.KPHI.SV.W.0129.000000T0000Z-230627T2045Z/
Montgomery PA-Philadelphia PA-
438 PM EDT Tue Jun 27 2023
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY AND
NORTHERN PHILADELPHIA COUNTIES WILL EXPIRE AT 445 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
Remember, a Severe Thunderstorm Warning still remains in effect
until 515 PM EDT.
LAT...LON 4005 7522 4022 7528 4025 7519 4009 7495
4007 7497 4006 7499 4006 7507
TIME...MOT...LOC 2037Z 248DEG 21KT 4017 7509
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 8:27 PM EDT | Special Weather Statement | PHI | Chester | 33 min |
| Jun 26, 8:33 PM EDT | Special Weather Statement | PHI | Philadelphia | 27 min |
| Jun 26, 8:36 PM EDT | Special Weather Statement | PHI | Bucks | 24 min |
| Jun 26, 8:40 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 31 min |
| Jun 26, 8:42 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 48 min |
| Jun 26, 9:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 42 min |
| Jun 26, 9:30 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 3 hr |
| Jun 26, 9:47 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 43 min |
| Jun 26, 9:51 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 54 min |
| Jun 26, 9:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 47 min |
| Jun 26, 10:33 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 42 min |
| Jun 26, 10:54 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 26, 11:07 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 53 min |
| Jun 26, 11:27 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 3 hr |
| Jun 26, 11:35 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 6 hr |
| Jun 27, 12:00 AM EDT | Areal Flood Warning | PHI | Bucks, Lehigh, Monroe, Northampton | 7 hr |
| Jun 27, 12:51 AM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 4 hr |
| Jun 27, 1:23 AM EDT | Special Weather Statement | PHI | Montgomery | 37 min |
| Jun 27, 2:23 AM EDT | River Flood Warning | PHI | Chester | 6 hr |
| Jun 27, 2:29 AM EDT | Special Weather Statement | PHI | Delaware | 31 min |
| Jun 27, 3:01 AM EDT | Special Weather Statement | PHI | Delaware, Montgomery, Philadelphia | 29 min |
| Jun 27, 3:02 AM EDT | Flood Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 46 min |
| Jun 27, 3:26 AM EDT | River Flood Warning | PHI | Delaware | 4 hr |
| Jun 27, 3:48 AM EDT | Flood Watch | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 17 hr |
| Jun 27, 3:54 AM EDT | River Flood Warning | PHI | Chester, Delaware | 5 hr |
| Jun 27, 6:14 AM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 3 hr |
| Jun 27, 6:16 AM EDT | Areal Flood Warning | PHI | Chester, Delaware | 3 hr |
| Jun 27, 10:08 AM EDT | River Flood Warning | PHI | Chester, Delaware | 109 min |
| Jun 27, 12:45 PM EDT | Special Weather Statement | PHI | Berks | 30 min |
| Jun 27, 2:13 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 47 min |
| Jun 27, 2:18 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 22 min |
| Jun 27, 2:21 PM EDT | Special Weather Statement | PHI | Berks | 24 min |
| Jun 27, 2:42 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Jun 27, 2:57 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Jun 27, 3:07 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 38 min |
| Jun 27, 3:25 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 19 min |
| Jun 27, 3:33 PM EDT | Special Weather Statement | PHI | Delaware | 27 min |
| Jun 27, 4:06 PM EDT | Special Weather Statement | PHI | Northampton | 24 min |
| Jun 27, 4:24 PM EDT | Areal Flood Advisory | PHI | Northampton | 3 hr |
| Jun 27, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 32 min |
| Jun 27, 4:33 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 42 min |
| Jun 27, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 51 min |
| Jun 27, 4:58 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 3 hr |
| Jun 27, 5:01 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 44 min |
| Jun 27, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 38 min |
| Jun 27, 5:43 PM EDT | Special Weather Statement | PHI | Monroe, Northampton | 32 min |
| Jun 27, 5:44 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 5 hr |
| Jun 27, 5:52 PM EDT | Areal Flood Advisory | PHI | Northampton | 3 hr |
| Jun 27, 5:57 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 3 hr |
| Jun 27, 6:15 PM EDT | Special Weather Statement | PHI | Northampton | 45 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023
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.