Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 142, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 24, 2020, 12:19 PM EDT for Armstrong County, Clarion County, Pennsylvania. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 24, 2020, 12:19 PM EDT (16:19 UTC)
- Expired
- Aug 24, 2020, 12:45 PM EDT
- In force
- 26 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Armstrong County, PA, Clarion County, PA
The radar
The Pittsburgh radar (KPBZ), 84 km from the middle of the area, began a volume at 16:22 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, 4.3 hours before the alert went out and 287 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
- 1012 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 913 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 24, 10:01 AM EDT, 2 hours 18 minutes earlier.
Area forecast discussion, Aug 24, 10:01 AM EDT, 2 hours 18 minutes before
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</html>Hazardous weather outlook, Aug 24, 3:58 AM EDT, 8 hours 21 minutes before
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Special weather statement, Aug 24, 12:14 PM EDT, 5 minutes before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 12:14 PM EDT | Special Weather Statement | PBZ | Westmoreland | 16 min |
| Aug 24, 12:29 PM EDT | Special Weather Statement | PBZ | Beaver | 16 min |
| Aug 24, 12:41 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 19 min |
| Aug 24, 1:25 PM EDT | Special Weather Statement | PBZ | Fayette | 35 min |
| Aug 24, 2:02 PM EDT | Special Weather Statement | PBZ | Jefferson | 28 min |
| Aug 24, 3:03 PM EDT | Special Weather Statement | PBZ | Jefferson | |
| Aug 24, 3:05 PM EDT | Special Weather Statement | PBZ | Westmoreland | 25 min |
| Aug 24, 7:05 PM EDT | Special Weather Statement | PBZ | Indiana | 25 min |
| Aug 24, 3:40 PM EDT | Special Weather Statement | PBZ | Coshocton | 35 min |
| Aug 24, 5:39 PM EDT | Special Weather Statement | PBZ | Carroll, Columbiana | 36 min |
| Aug 24, 7:33 PM EDT | Special Weather Statement | PBZ | Muskingum | 27 min |
| Aug 24, 7:50 PM EDT | Special Weather Statement | PBZ | Coshocton | 25 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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.