Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 149, NWS Pittsburgh, PA

August 25, 20206 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 25, 2020, 12:29 PM EDT for 6 counties in Pennsylvania. It was in force for 46 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 25, 2020, 12:29 PM EDT (16:29 UTC)
Expired: Aug 25, 2020, 1:15 PM EDT
In force: 46 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Armstrong County, PA, Butler County, PA, Clarion County, PA, Forest County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 86 km from the middle of the area, began a volume at 16:30 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

Pittsburgh, PA (KPIT), launched 12:00Z, 4.5 hours before the alert went out and 94 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1286 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.1

Open this sounding in Storm Lab

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 25, 9:59 AM EDT, 2 hours 30 minutes earlier.

Area forecast discussion, Aug 25, 9:59 AM EDT, 2 hours 30 minutes before

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Hazardous weather outlook, Aug 25, 6:44 AM EDT, 5 hours 45 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
644 AM EDT Tue Aug 25 2020

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-261045-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-
Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-
Forest-Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-
Armstrong-Indiana-Washington-Greene-Westmoreland-Westmoreland Ridges-
Fayette-Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-
Monongalia-Ridges of Eastern Monongalia and Northwestern Preston-
Preston-Eastern Preston-Western Tucker-Eastern Tucker-
644 AM EDT Tue Aug 25 2020

This Hazardous Weather Outlook is for western Maryland, east
central Ohio, northwest Pennsylvania, southwest Pennsylvania,
western Pennsylvania, northern West Virginia and the northern
panhandle of West Virginia.

.DAY ONE...Today and tonight.

Scattered severe thunderstorms are possible today. Damaging wind is
the primary hazard, but severe hail is possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

There is a slight risk for severe thunderstorms on Wednesday. The
primary hazard will be damaging wind gusts.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

In the hours before

Local storm report, Aug 25, 8:18 AM EDT, 4 hours 11 minutes before

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Local storm report, Aug 25, 8:34 AM EDT, 3 hours 55 minutes before

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Local storm report, Aug 25, 8:54 AM EDT, 3 hours 35 minutes before

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Special weather statement, Aug 25, 8:55 AM EDT, 3 hours 34 minutes before

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Local storm report, Aug 25, 9:33 AM EDT, 2 hours 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
933 AM EDT TUE AUG 25 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0915 AM     TSTM WND DMG     JEANNETTE               40.33N  79.61W
08/25/2020                   WESTMORELAND       PA   911 CALL CENTER

            TREES DOWN AT 125 ASHBAUGH RD.

&&

EVENT NUMBER PBZ2001233

Local storm report, Aug 25, 9:37 AM EDT, 2 hours 52 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PITTSBURGH PA
937 AM EDT TUE AUG 25 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0817 AM     TSTM WND DMG     JEANNETTE               40.33N  79.61W
08/25/2020                   WESTMORELAND       PA   911 CALL CENTER

            TREES DOWN AT 125 ASHBAUGH RD.

&&

CORRECTED EVENT TIME

EVENT NUMBER PBZ2001233

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 6:41 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Westmoreland	19 min
Aug 25, 7:10 AM EDT	Special Weather Statement	PBZ	Westmoreland	20 min
Aug 25, 7:41 AM EDT	Special Weather Statement	PBZ	Westmoreland	49 min
Aug 25, 7:55 AM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	50 min
Aug 25, 8:06 AM EDT	Special Weather Statement	PBZ	Allegheny	24 min
Aug 25, 8:18 AM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	27 min
Aug 25, 9:05 AM EDT	Severe Thunderstorm Warning	PBZ	Fayette	25 min
Aug 25, 11:58 AM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	32 min
Aug 25, 1:12 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Mercer, Venango	48 min
Aug 25, 1:36 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion	39 min
Aug 25, 2:07 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Mercer, Venango	38 min
Aug 25, 2:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	51 min
Aug 25, 2:26 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	23 min
Aug 25, 2:29 PM EDT	Special Weather Statement	PBZ	Washington	31 min
Aug 25, 2:34 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	41 min
Aug 25, 3:07 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	38 min
Aug 25, 3:15 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Fayette, Indiana, Westmoreland	45 min
Aug 25, 3:39 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	51 min
Aug 25, 4:00 PM EDT	Special Weather Statement	PBZ	Allegheny	30 min
Aug 25, 4:08 PM EDT	Special Weather Statement	PBZ	Westmoreland	37 min
Aug 25, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	32 min
Aug 25, 4:20 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene	40 min
Aug 25, 4:40 PM EDT	Special Weather Statement	PBZ	Fayette, Washington	50 min
Aug 25, 5:01 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	29 min
Aug 25, 5:05 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	25 min
Aug 25, 5:34 PM EDT	Special Weather Statement	PBZ	Fayette	26 min
Aug 25, 1:18 PM EDT	Special Weather Statement	PBZ	Coshocton, Harrison, Tuscarawas	42 min
Aug 25, 1:43 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Harrison, Tuscarawas	32 min
Aug 25, 1:53 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Tuscarawas	52 min
Aug 25, 1:57 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Harrison, Muskingum, Tuscarawas	48 min
Aug 25, 2:00 PM EDT	Special Weather Statement	PBZ	Muskingum	30 min
Aug 25, 2:23 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Harrison, Jefferson	52 min
Aug 25, 2:47 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton	43 min
Aug 25, 2:52 PM EDT	Special Weather Statement	PBZ	Belmont	38 min
Aug 25, 3:11 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Muskingum, Noble	49 min
Aug 25, 3:26 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Coshocton, Guernsey, Harrison, Muskingum, Noble and 1 more	49 min
Aug 25, 3:35 PM EDT	Special Weather Statement	PBZ	Monroe	25 min
Aug 25, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Monroe, Muskingum, Noble	29 min
Aug 25, 8:55 AM EDT	Special Weather Statement	PBZ	Tucker	35 min
Aug 25, 3:13 PM EDT	Special Weather Statement	PBZ	Wetzel	32 min
Aug 25, 5:03 PM EDT	Severe Thunderstorm Warning	PBZ	Preston, Tucker	42 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Every 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.