Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 313, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 7, 2023, 6:18 PM EDT for New Castle County, Delaware; Chester County, Delaware County, Montgomery County, Pennsylvania. It was in force for 42 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
- Sep 7, 2023, 6:18 PM EDT (22:18 UTC)
- Expired
- Sep 7, 2023, 7:00 PM EDT
- In force
- 42 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Chester County, PA, Delaware County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 22:20 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 |
|---|---|---|---|
| Sep 7, 6:28 PM EDT | HAIL 0.7 | Downington, PA | Mixture of pea up to dime sized hail reported in Downingtown. |
| Sep 7, 6:44 PM EDT | HAIL 0.5 | 2 Sse 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 |
|---|---|---|---|
| Sep 7, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 187 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
- 2091 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1114 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
706
WUUS51 KPHI 072218
SVRPHI
DEC003-PAC029-045-091-072300-
/O.NEW.KPHI.SV.W.0313.230907T2218Z-230907T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
618 PM EDT Thu Sep 7 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern New Castle County in northern Delaware...
West central Montgomery County in southeastern Pennsylvania...
Eastern Chester County in southeastern Pennsylvania...
Southwestern Delaware County in southeastern Pennsylvania...
* Until 700 PM EDT.
* At 618 PM EDT, severe thunderstorms were located along a line
extending from near Downingtown to North Star, moving northeast 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...
Wilmington, Newark, West Chester, Phoenixville, West Norriton,
Westtown, Downingtown, Elsmere, Kennett Square, Collegeville,
Royersford, Trappe, Schwenksville, Newport, Arden, Stanton,
Cheyney, Talleyville, Pughtown and Elam.
This includes the following highways...
Pennsylvania Turnpike between mile markers 306 and 325.
Interstate 95 in Pennsylvania near mile marker 0.
Interstate 95 in Delaware between mile markers 12 and 23.
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 4012 7576 4031 7540 3978 7544 3976 7546
3964 7579 3973 7579
TIME...MOT...LOC 2218Z 229DEG 22KT 4005 7571 3976 7573
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS2 follow-up statements
158
WWUS51 KPHI 072234
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
634 PM EDT Thu Sep 7 2023
DEC003-072244-
/O.CAN.KPHI.SV.W.0313.000000T0000Z-230907T2300Z/
New Castle DE-
634 PM EDT Thu Sep 7 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southeastern Pennsylvania.
LAT...LON 3985 7561 3978 7574 4017 7567 4031 7540
4003 7542 3998 7543
TIME...MOT...LOC 2234Z 220DEG 25KT 4017 7563 3988 7568
$$
PAC029-045-091-072300-
/O.CON.KPHI.SV.W.0313.000000T0000Z-230907T2300Z/
Montgomery PA-Chester PA-Delaware PA-
634 PM EDT Thu Sep 7 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR WEST CENTRAL MONTGOMERY...EASTERN CHESTER AND WEST CENTRAL
DELAWARE COUNTIES...
At 634 PM EDT, severe thunderstorms were located along a line
extending from Pughtown to near Kennett Square, moving northeast 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...
West Chester, Phoenixville, West Norriton, Westtown, Downingtown,
Kennett Square, Collegeville, Royersford, Trappe, Schwenksville,
Cheyney, Pughtown, Marshallton, Spring Mount, Lionville-Marchwood,
Valley Forge, Paoli, Chester Springs, Lionville and Hockessin.
This includes Pennsylvania Turnpike between mile markers 311 and 325.
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 3985 7561 3978 7574 4017 7567 4031 7540
4003 7542 3998 7543
TIME...MOT...LOC 2234Z 220DEG 25KT 4017 7563 3988 7568
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS673
WWUS51 KPHI 072250
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
650 PM EDT Thu Sep 7 2023
PAC029-045-091-072300-
/O.EXP.KPHI.SV.W.0313.000000T0000Z-230907T2300Z/
Montgomery PA-Chester PA-Delaware PA-
650 PM EDT Thu Sep 7 2023
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MONTGOMERY...
EASTERN CHESTER AND WEST CENTRAL DELAWARE COUNTIES WILL EXPIRE AT 700
PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southeastern Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 3985 7561 3978 7574 4017 7567 4031 7540
4003 7542 3998 7543
TIME...MOT...LOC 2250Z 229DEG 22KT 4023 7554 3994 7559
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 1:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 33 min |
| Sep 7, 1:38 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 19 min |
| Sep 7, 2:10 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 50 min |
| Sep 7, 2:13 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 47 min |
| Sep 7, 2:52 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 24 min |
| Sep 7, 4:35 PM EDT | Special Weather Statement | PHI | Berks | 25 min |
| Sep 7, 4:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 43 min |
| Sep 7, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe | 43 min |
| Sep 7, 5:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 31 min |
| Sep 7, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 41 min |
| Sep 7, 5:44 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Lehigh, Montgomery, Northampton | 46 min |
| Sep 7, 5:48 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 42 min |
| Sep 7, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Monroe, Northampton | 34 min |
| Sep 7, 6:06 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 24 min |
| Sep 7, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Monroe, Northampton | 24 min |
| Sep 7, 7:00 PM EDT | Special Weather Statement | PHI | Montgomery | 30 min |
| Sep 7, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 39 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2023Severe Thunderstorm Warnings in Delaware, 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.