Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 209, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 20, 2023, 1:53 PM EDT for Chester County, Pennsylvania. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2023, 1:53 PM EDT (17:53 UTC)
- Expired
- Jul 20, 2023, 2:33 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
County Chester County, PA
The radar
The Dover AFB radar (KDOX), 120 km from the middle of the area, began a volume at 17:57 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.9 hours before the alert went out and 151 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
- 2 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 1313 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
126
WUUS51 KPHI 201753
SVRPHI
PAC029-201845-
/O.NEW.KPHI.SV.W.0209.230720T1753Z-230720T1845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
153 PM EDT Thu Jul 20 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Chester County in southeastern Pennsylvania...
* Until 245 PM EDT.
* At 153 PM EDT, a severe thunderstorm was located over Homeville, or
15 miles southeast of Willow Street, moving south at 15 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...
Oxford, Homeville, Glen Roy, Mount Vernon, Cochranville,
Kemblesville and Atglen.
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 3974 7612 3973 7610 3974 7610 3976 7606
3981 7603 3983 7604 3983 7602 3987 7601
3987 7599 3992 7600 3994 7598 3995 7592
3972 7581 3972 7613 3973 7613
TIME...MOT...LOC 1753Z 348DEG 11KT 3987 7602
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS2 follow-up statements
675
WWUS51 KPHI 201816
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
216 PM EDT Thu Jul 20 2023
PAC029-201845-
/O.CON.KPHI.SV.W.0209.000000T0000Z-230720T1845Z/
Chester PA-
216 PM EDT Thu Jul 20 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR SOUTHWESTERN CHESTER COUNTY...
At 216 PM EDT, a severe thunderstorm was located near Homeville, or
14 miles northwest of Newark, moving southeast at 15 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Oxford, Kemblesville, Homeville, Mount Vernon and Cochranville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Mount Holly NJ.
&&
LAT...LON 3986 7601 3987 7599 3988 7599 3994 7591
3972 7581 3972 7599 3978 7605 3981 7603
3983 7604 3983 7602
TIME...MOT...LOC 1816Z 316DEG 13KT 3983 7593
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS182
WWUS51 KPHI 201833
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
233 PM EDT Thu Jul 20 2023
PAC029-201843-
/O.CAN.KPHI.SV.W.0209.000000T0000Z-230720T1845Z/
Chester PA-
233 PM EDT Thu Jul 20 2023
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHESTER COUNTY IS
CANCELLED...
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 has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
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 3986 7601 3987 7599 3988 7599 3994 7591
3972 7581 3972 7599 3978 7605 3981 7603
3983 7604 3983 7602
TIME...MOT...LOC 1829Z 348DEG 11KT 3978 7592
$$
MPSNearby
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.