Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 134, NWS Pittsburgh, PA

August 12, 2014Allegheny County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 12, 2014, 4:18 PM EDT for Allegheny County, Westmoreland County, Pennsylvania. It was in force for 42 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 12, 2014, 4:18 PM EDT (20:18 UTC)
Expired: Aug 12, 2014, 5:00 PM EDT
In force: 42 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Allegheny County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 45 km from the middle of the area, began a volume at 20:21 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 (KAGC), launched 12:00Z, 8.3 hours before the alert went out and 32 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: 74 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 495 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 12, 2:58 PM EDT, 1 hour 20 minutes earlier.

Area forecast discussion, Aug 12, 2:58 PM EDT, 1 hour 20 minutes before

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Hazardous weather outlook, Aug 12, 3:27 AM EDT, 12 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
327 AM EDT TUE AUG 12 2014

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021>023-041-130730-
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-PRESTON-TUCKER-
327 AM EDT TUE AUG 12 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST
CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST
PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA
AND NORTHERN PANHANDLE OF WEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY WITH THE
PRIMARY HAZARD COMING FROM DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

15

In the hours before

Local storm report, Aug 12, 3:47 PM EDT, 31 minutes before

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Local storm report, Aug 12, 3:52 PM EDT, 26 minutes before

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Local storm report, Aug 12, 3:55 PM EDT, 23 minutes before

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Special weather statement, Aug 12, 4:01 PM EDT, 17 minutes before

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Local storm report, Aug 12, 4:04 PM EDT, 14 minutes before

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Special weather statement, Aug 12, 4:14 PM EDT, 4 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 12, 2:43 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	32 min
Aug 12, 3:15 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	30 min
Aug 12, 3:25 PM EDT	Special Weather Statement	PBZ	Beaver	35 min
Aug 12, 3:46 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver	29 min
Aug 12, 4:01 PM EDT	Special Weather Statement	PBZ	Allegheny	44 min
Aug 12, 4:06 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	24 min
Aug 12, 4:14 PM EDT	Special Weather Statement	PBZ	Allegheny	31 min
Aug 12, 4:28 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Armstrong, Butler	92 min
Aug 12, 4:36 PM EDT	Special Weather Statement	PBZ	Armstrong	24 min
Aug 12, 4:48 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	42 min
Aug 12, 5:06 PM EDT	Special Weather Statement	PBZ	Mercer	24 min
Aug 12, 5:25 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Armstrong, Clarion, Indiana, Jefferson, Westmoreland	95 min
Aug 12, 5:27 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana	48 min
Aug 12, 5:52 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson	38 min
Aug 12, 6:35 PM EDT	Areal Flood Advisory	PBZ	Indiana, Jefferson	55 min
Aug 11, 8:32 PM EDT	Areal Flood Advisory	PBZ	Coshocton, Muskingum	3 hr
Aug 11, 10:27 PM EDT	Areal Flood Warning	PBZ	Coshocton, Tuscarawas	10 hr
Aug 12, 12:04 PM EDT	Special Weather Statement	PBZ	Muskingum	41 min
Aug 12, 12:51 PM EDT	Special Weather Statement	PBZ	Guernsey	39 min
Aug 12, 1:28 PM EDT	Special Weather Statement	PBZ	Carroll	32 min
Aug 12, 1:33 PM EDT	Special Weather Statement	PBZ	Guernsey	27 min
Aug 12, 1:48 PM EDT	Special Weather Statement	PBZ	Carroll	27 min
Aug 12, 2:11 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana, Jefferson	34 min
Aug 12, 2:15 PM EDT	Special Weather Statement	PBZ	Harrison	30 min
Aug 12, 2:58 PM EDT	Special Weather Statement	PBZ	Brooke, Hancock	32 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Every severe thunderstorm warning in 2014

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.