Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 57, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 6, 2023, 3:56 PM EDT for 4 counties in Pennsylvania. It was in force for 35 min. 3 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 6, 2023, 3:56 PM EDT (19:56 UTC)
- Expired
- Jun 6, 2023, 4:31 PM EDT
- In force
- 35 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 19:58 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 6, 4:05 PM EDT | TSTM WND DMG | 1 Wnw Norristown, PA | Tree fell on wires at Haws Ave. and W. Oak St. |
| Jun 6, 4:05 PM EDT | TSTM WND GST 52 | King Of Prussia, PA | trees and wires down. |
| Jun 6, 4:05 PM EDT | HAIL 1.75 | King Of Prussia, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.9 hours before the alert went out and 213 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
- 2274 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
818
WUUS51 KPHI 061956
SVRPHI
PAC029-045-091-101-062045-
/O.NEW.KPHI.SV.W.0057.230606T1956Z-230606T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
356 PM EDT Tue Jun 6 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
South central Montgomery County in southeastern Pennsylvania...
Northeastern Chester County in southeastern Pennsylvania...
Northwestern Philadelphia County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
* Until 445 PM EDT.
* At 356 PM EDT, a severe thunderstorm was located over Collegeville,
or 16 miles northeast of West Chester, moving southeast at 20 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Norristown, Phoenixville, West Norriton, East
Norriton, Conshohocken, Collegeville, Narberth, Trappe, Morris
Park, Germantown, Bryn Mawr, Trout Lake, Radnor Township, Valley
Forge, Broomall, Plymouth Meeting, Chestnut Hill, King Of Prussia
and Drexel Hill.
This includes the following highways...
Pennsylvania Turnpike between mile markers 323 and 334.
Interstate 76 in Pennsylvania between mile markers 327 and 339.
Interstate 476 in Pennsylvania between mile markers 6 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.
&&
LAT...LON 4013 7553 4021 7546 4005 7514 3993 7534
TIME...MOT...LOC 1956Z 316DEG 17KT 4016 7545
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS3 follow-up statements
188
WWUS51 KPHI 062010
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
410 PM EDT Tue Jun 6 2023
PAC029-045-091-101-062045-
/O.CON.KPHI.SV.W.0057.000000T0000Z-230606T2045Z/
Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
410 PM EDT Tue Jun 6 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTH CENTRAL MONTGOMERY...EAST CENTRAL CHESTER...NORTHWESTERN
PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES...
At 410 PM EDT, a severe thunderstorm was located over King Of
Prussia, or 12 miles west of Philadelphia, moving southeast at 35
mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind damage
to roofs, siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, Norristown, West Norriton, East Norriton, Conshohocken,
Narberth, Morris Park, Germantown, Bryn Mawr, Trout Lake, Radnor
Township, Broomall, Plymouth Meeting, Chestnut Hill, King Of Prussia,
Drexel Hill, Bridgeport, West Conshohocken, Springfield and
Devon-Berwyn.
This includes the following highways...
Pennsylvania Turnpike between mile markers 323 and 334.
Interstate 76 in Pennsylvania between mile markers 327 and 339.
Interstate 476 in Pennsylvania between mile markers 6 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
&&
LAT...LON 4008 7548 4016 7536 4005 7514 3993 7534
TIME...MOT...LOC 2010Z 319DEG 30KT 4008 7535
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS307
WWUS51 KPHI 062020
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
420 PM EDT Tue Jun 6 2023
PAC029-062030-
/O.CAN.KPHI.SV.W.0057.000000T0000Z-230606T2045Z/
Chester PA-
420 PM EDT Tue Jun 6 2023
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CHESTER COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4000 7541 4012 7528 4005 7514 3994 7533
3999 7539
TIME...MOT...LOC 2020Z 309DEG 26KT 4003 7527
$$
PAC045-091-101-062045-
/O.CON.KPHI.SV.W.0057.000000T0000Z-230606T2045Z/
Montgomery PA-Philadelphia PA-Delaware PA-
420 PM EDT Tue Jun 6 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTH CENTRAL MONTGOMERY...NORTHWESTERN PHILADELPHIA AND
NORTHEASTERN DELAWARE COUNTIES...
At 420 PM EDT, a severe thunderstorm was located over Narberth, or 7
miles west of Philadelphia, moving southeast at 30 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Wind damage
to roofs, siding, trees, and power lines is possible.
Locations impacted include...
Philadelphia, Conshohocken, Narberth, Broomall, Plymouth Meeting,
Germantown, Bryn Mawr, Chestnut Hill, Trout Lake, Radnor Township,
Drexel Hill, West Conshohocken, Springfield, Penn Wynne, Ardmore and
Wyndmoor.
This includes the following highways...
Pennsylvania Turnpike near mile marker 334.
Interstate 76 in Pennsylvania between mile markers 331 and 339.
Interstate 476 in Pennsylvania between mile markers 7 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
&&
LAT...LON 4000 7541 4012 7528 4005 7514 3994 7533
3999 7539
TIME...MOT...LOC 2020Z 309DEG 26KT 4003 7527
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS905
WWUS51 KPHI 062031
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
431 PM EDT Tue Jun 6 2023
PAC045-091-101-062041-
/O.CAN.KPHI.SV.W.0057.000000T0000Z-230606T2045Z/
Montgomery PA-Philadelphia PA-Delaware PA-
431 PM EDT Tue Jun 6 2023
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MONTGOMERY...
NORTHWESTERN PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.
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 4000 7541 4012 7528 4005 7514 3994 7533
3999 7539
TIME...MOT...LOC 2030Z 316DEG 17KT 3999 7522
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 3:49 AM EDT | Red Flag Warning | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 16 hr |
| Jun 6, 2:15 PM EDT | Special Weather Statement | PHI | Northampton | 30 min |
| Jun 6, 2:28 PM EDT | Special Weather Statement | PHI | Berks | 32 min |
| Jun 6, 2:58 PM EDT | Special Weather Statement | PHI | Berks | 32 min |
| Jun 6, 3:45 PM EDT | Special Weather Statement | PHI | Montgomery | 30 min |
| Jun 6, 4:00 PM EDT | Special Weather Statement | PHI | Berks | 30 min |
| Jun 6, 4:06 PM EDT | Special Weather Statement | PHI | Berks | 24 min |
| Jun 6, 4:13 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 36 min |
| Jun 6, 4:25 PM EDT | Special Weather Statement | PHI | Philadelphia | 35 min |
| Jun 6, 4:41 PM EDT | Special Weather Statement | PHI | Chester | 34 min |
| Jun 6, 4:46 PM EDT | Special Weather Statement | PHI | Delaware | 29 min |
| Jun 6, 5:05 PM EDT | Special Weather Statement | PHI | Chester | 25 min |
| Jun 6, 5:45 PM EDT | Special Weather Statement | PHI | Berks | 30 min |
| Jun 6, 6:15 PM EDT | Special Weather Statement | PHI | Chester | 30 min |
| Jun 6, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 51 min |
| Jun 6, 7:39 PM EDT | Special Weather Statement | PHI | Chester | 36 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.