Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 23, NWS Pittsburgh, PA

April 10, 20137 counties in Pennsylvania; 4 counties in West Virginia

NWS Pittsburgh, PA issued this severe thunderstorm warning at Apr 10, 2013, 9:40 PM EDT for 7 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 50 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: Apr 10, 2013, 9:40 PM EDT (01:40 UTC)
Expired: Apr 10, 2013, 10:30 PM EDT
In force: 50 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Allegheny County, PA, Armstrong County, PA, Fayette County, PA, Greene County, PA, Indiana County, PA, Washington County, PA, Westmoreland County, PA, Marion County, WV, Monongalia County, WV, Preston County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 62 km from the middle of the area, began a volume at 01:42 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
Apr 10, 6:13 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 1.7 hours before the alert went out and 45 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: 173 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

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 Apr 10, 6:33 PM EDT, 3 hours 7 minutes earlier.

Area forecast discussion, Apr 10, 6:33 PM EDT, 3 hours 7 minutes before

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Hazardous weather outlook, Apr 10, 6:22 PM EDT, 3 hours 18 minutes before

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In the hours before

Special weather statement, Apr 10, 7:40 PM EDT, 2 hours before

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Local storm report, Apr 10, 7:42 PM EDT, 1 hour 58 minutes before

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Local storm report, Apr 10, 7:52 PM EDT, 1 hour 48 minutes before

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Local storm report, Apr 10, 7:56 PM EDT, 1 hour 44 minutes before

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Local storm report, Apr 10, 7:57 PM EDT, 1 hour 43 minutes before

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Local storm report, Apr 10, 7:59 PM EDT, 1 hour 41 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 8:51 PM EDT	Special Weather Statement	PBZ	Allegheny, Beaver, Washington	54 min
Apr 10, 9:24 PM EDT	Special Weather Statement	PBZ	Allegheny, Armstrong, Fayette, Greene, Indiana, Washington and 1 more	36 min
Apr 11, 3:53 AM EDT	Flood Watch	PBZ	Armstrong, Beaver, Butler, Clarion, Forest, Jefferson and 3 more	24 hr
Apr 11, 11:46 AM EDT	River Flood Advisory	PBZ	Allegheny	16 hr
Apr 10, 8:17 PM EDT	Special Weather Statement	PBZ	Belmont, Carroll, Harrison, Jefferson, Tuscarawas	58 min
Apr 11, 11:20 AM EDT	Areal Flood Warning	PBZ	Carroll, Columbiana, Coshocton, Tuscarawas	24 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2013 Severe Thunderstorm Warnings in West Virginia, 2013 Every severe thunderstorm warning in 2013

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.