Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 286, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 2, 2020, 8:07 PM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 53 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
- Sep 2, 2020, 8:07 PM EDT (00:07 UTC)
- Expired
- Sep 2, 2020, 9:00 PM EDT
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cecil County, MD, Chester County, PA
The radar
The Dover AFB radar (KDOX), 103 km from the middle of the area, began a volume at 00:06 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 2, 6:43 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.1 hours before the alert went out and 144 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
- 1723 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 847 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 8.6
The text
As transmitted.
612
WUUS51 KPHI 030007
SVRPHI
MDC015-PAC029-030100-
/O.NEW.KPHI.SV.W.0286.200903T0007Z-200903T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
807 PM EDT Wed Sep 2 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Cecil County in northeastern Maryland...
Southwestern Chester County in southeastern Pennsylvania...
* Until 900 PM EDT.
* At 806 PM EDT, a severe thunderstorm was located near
Jarrettsville, or 16 miles northwest of Aberdeen, 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...
Elkton, Calvert, Oxford, North East, West Grove, Rising Sun,
Charlestown, Cecilton, Warwick, Homeville, Glen Roy, Zion, Blake,
Barksdale, Bohemias Mills, West Nottingham, Octoraro, Brantwood,
Mount Vernon and Fair Hill.
This includes Interstate 95 in Maryland between mile markers 91 and
109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3972 7614 3974 7612 3973 7610 3986 7601
3989 7578 3972 7577 3972 7579 3962 7579
3938 7577 3943 7600 3946 7601 3952 7598
3955 7603 3955 7608 3972 7623
TIME...MOT...LOC 0006Z 271DEG 29KT 3967 7642
HAIL...<.75IN
WIND...60MPH
$$
Iovino1 follow-up statement
233
WWUS51 KPHI 030032
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
832 PM EDT Wed Sep 2 2020
MDC015-PAC029-030100-
/O.CON.KPHI.SV.W.0286.000000T0000Z-200903T0100Z/
Cecil MD-Chester PA-
832 PM EDT Wed Sep 2 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CECIL AND SOUTHWESTERN CHESTER COUNTIES...
At 831 PM EDT, a severe thunderstorm was located over Octoraro, or 8
miles north of Havre De Grace, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Elkton, Calvert, Oxford, North East, West Grove, Rising Sun,
Charlestown, Cecilton, Warwick, Homeville, Glen Roy, Zion, Blake,
Barksdale, Bohemias Mills, West Nottingham, Octoraro, Brantwood,
Mount Vernon and Fair Hill.
This includes Interstate 95 in Maryland between mile markers 91 and
109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3972 7614 3974 7612 3973 7610 3986 7601
3989 7578 3972 7577 3972 7579 3962 7579
3938 7577 3943 7600 3946 7601 3952 7598
3955 7603 3955 7608 3972 7623
TIME...MOT...LOC 0031Z 271DEG 29KT 3967 7615
HAIL...<.75IN
WIND...60MPH
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 7:14 PM EDT | Special Weather Statement | PHI | Bucks | 46 min |
| Sep 3, 7:16 PM EDT | Special Weather Statement | PHI | Montgomery | 44 min |
| Sep 3, 7:17 PM EDT | Special Weather Statement | PHI | Delaware, Philadelphia | 43 min |
| Sep 2, 8:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 58 min |
| Sep 2, 10:08 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 67 min |
| Sep 3, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 73 min |
| Sep 3, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 57 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in Maryland, 2020Every severe thunderstorm warning in 2020
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.