Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 57, NWS Pittsburgh, PA

May 29, 2020Beaver County, Washington County, Pennsylvania; Jefferson County, Ohio; Hancock County, West Virginia

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 29, 2020, 4:23 PM EDT for Beaver County, Washington County, Pennsylvania; Jefferson County, Ohio; Hancock County, West Virginia. It was in force for 24 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
May 29, 2020, 4:23 PM EDT (20:23 UTC)
Expired
May 29, 2020, 4:47 PM EDT
In force
24 min
Issued by
NWS Pittsburgh, PA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Jefferson County, OH, Beaver County, PA, Washington County, PA, Hancock County, WV

The radar

The Pittsburgh radar (KPBZ), 24 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 33 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2020-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 137 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2020-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
137 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1023 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

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 May 29, 4:17 PM EDT, 6 minutes earlier.

Area forecast discussion, May 29, 4:17 PM EDT, 6 minutes before
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Hazardous weather outlook, May 29, 2:12 AM EDT, 14 hours 11 minutes before
Hazardous Weather Outlook
National Weather Service Pittsburgh PA
212 AM EDT Fri May 29 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>514-300615-
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-
212 AM EDT Fri May 29 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.

Severe storms are possible this afternoon and will continue
into the evening with the passage of a cold front.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, May 29, 3:50 PM EDT, 33 minutes before
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Special weather statement, May 29, 3:50 PM EDT, 33 minutes before
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Special weather statement, May 29, 3:52 PM EDT, 31 minutes before
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Local storm report, May 29, 4:04 PM EDT, 19 minutes before
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Local storm report, May 29, 4:21 PM EDT, 2 minutes before
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Special weather statement, May 29, 4:23 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 11:41 AM EDTSpecial Weather StatementPBZMercer49 min
May 29, 12:13 PM EDTSpecial Weather StatementPBZMercer, Venango47 min
May 29, 2:28 PM EDTSevere Thunderstorm WarningPBZBeaver47 min
May 29, 2:38 PM EDTSpecial Weather StatementPBZLawrence, Mercer67 min
May 29, 3:18 PM EDTSpecial Weather StatementPBZButler27 min
May 29, 3:19 PM EDTSpecial Weather StatementPBZLawrence41 min
May 29, 3:50 PM EDTSpecial Weather StatementPBZButler40 min
May 29, 3:52 PM EDTSpecial Weather StatementPBZVenango38 min
May 29, 4:00 PM EDTSevere Thunderstorm WarningPBZBeaver30 min
May 29, 4:23 PM EDTSpecial Weather StatementPBZForest52 min
May 29, 4:24 PM EDTSevere Thunderstorm WarningPBZAllegheny, Armstrong, Beaver, Butler, Westmoreland36 min
May 29, 4:28 PM EDTSpecial Weather StatementPBZClarion47 min
May 29, 4:33 PM EDTSpecial Weather StatementPBZArmstrong27 min
May 29, 4:54 PM EDTSpecial Weather StatementPBZFayette36 min
May 29, 4:54 PM EDTSevere Thunderstorm WarningPBZArmstrong, Clarion, Indiana, Jefferson51 min
May 29, 5:18 PM EDTSpecial Weather StatementPBZAllegheny27 min
May 29, 5:24 PM EDTSpecial Weather StatementPBZFayette36 min
May 29, 5:36 PM EDTSpecial Weather StatementPBZJefferson24 min
May 29, 5:50 PM EDTSpecial Weather StatementPBZIndiana25 min
May 29, 6:23 PM EDTSpecial Weather StatementPBZIndiana37 min
May 29, 6:41 PM EDTSpecial Weather StatementPBZWestmoreland34 min
May 29, 6:52 PM EDTSpecial Weather StatementPBZWashington23 min
May 29, 1:38 PM EDTSpecial Weather StatementPBZHarrison37 min
May 29, 1:50 PM EDTSevere Thunderstorm WarningPBZCarroll, Columbiana, Harrison, Jefferson, Tuscarawas40 min
May 29, 2:36 PM EDTSpecial Weather StatementPBZCarroll, Columbiana, Tuscarawas24 min
May 29, 2:49 PM EDTSevere Thunderstorm WarningPBZCarroll, Tuscarawas41 min
May 29, 2:53 PM EDTSpecial Weather StatementPBZGuernsey37 min
May 29, 3:12 PM EDTSpecial Weather StatementPBZHarrison, Jefferson33 min
May 29, 5:47 PM EDTSpecial Weather StatementPBZGuernsey28 min
May 29, 2:11 PM EDTSpecial Weather StatementPBZMarion, Monongalia34 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020Severe Thunderstorm Warnings in Ohio, 2020Severe Thunderstorm Warnings in West Virginia, 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.