Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 215, NWS Pittsburgh, PA

August 7, 2013Fayette County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 7, 2013, 6:16 PM EDT for Fayette County, Westmoreland County, Pennsylvania. It was in force for 59 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 7, 2013, 6:16 PM EDT (22:16 UTC)
Expired: Aug 7, 2013, 7:15 PM EDT
In force: 59 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Fayette County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 73 km from the middle of the area, began a volume at 22:18 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
Aug 7, 3:49 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 10.3 hours before the alert went out and 57 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: 22 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 1075 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 7, 5:39 PM EDT, 37 minutes earlier.

Area forecast discussion, Aug 7, 5:39 PM EDT, 37 minutes before

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Hazardous weather outlook, Aug 7, 5:37 PM EDT, 39 minutes before

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In the hours before

Local storm report, Aug 7, 5:15 PM EDT, 1 hour 1 minute before

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Local storm report, Aug 7, 5:26 PM EDT, 50 minutes before

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Special weather statement, Aug 7, 5:40 PM EDT, 36 minutes before

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Special weather statement, Aug 7, 5:44 PM EDT, 32 minutes before

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Local storm report, Aug 7, 6:03 PM EDT, 13 minutes before

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Local storm report, Aug 7, 6:05 PM EDT, 11 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
Aug 7, 2:59 PM EDT	Special Weather Statement	PBZ	Mercer, Venango	61 min
Aug 7, 3:04 PM EDT	Special Weather Statement	PBZ	Lawrence	56 min
Aug 7, 3:42 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion	48 min
Aug 7, 4:18 PM EDT	Special Weather Statement	PBZ	Clarion, Jefferson	42 min
Aug 7, 4:22 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong	38 min
Aug 7, 4:29 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	46 min
Aug 7, 4:49 PM EDT	Special Weather Statement	PBZ	Greene	56 min
Aug 7, 5:01 PM EDT	Special Weather Statement	PBZ	Indiana	44 min
Aug 7, 5:06 PM EDT	Special Weather Statement	PBZ	Indiana	39 min
Aug 7, 5:16 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	44 min
Aug 7, 5:40 PM EDT	Special Weather Statement	PBZ	Fayette	65 min
Aug 7, 5:44 PM EDT	Special Weather Statement	PBZ	Washington	46 min
Aug 7, 5:55 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	50 min
Aug 7, 6:23 PM EDT	Areal Flood Advisory	PBZ	Armstrong, Indiana	3 hr
Aug 7, 6:30 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Fayette, Washington, Westmoreland	3 hr
Aug 7, 6:35 PM EDT	Special Weather Statement	PBZ	Fayette	40 min
Aug 7, 4:03 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana	42 min
Aug 7, 4:08 PM EDT	Special Weather Statement	PBZ	Tuscarawas	52 min
Aug 7, 4:38 PM EDT	Special Weather Statement	PBZ	Tuscarawas	52 min
Aug 7, 5:12 PM EDT	Special Weather Statement	PBZ	Harrison	48 min
Aug 7, 5:54 PM EDT	Areal Flood Advisory	PBZ	Harrison, Jefferson	3 hr
Aug 7, 4:13 PM EDT	Special Weather Statement	PBZ	Wetzel	47 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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.