Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 108, NWS Pittsburgh, PA

June 21, 2007Beaver County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2007, 2:22 PM EDT for Beaver County, Pennsylvania. It was in force for 23 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: Jun 21, 2007, 2:22 PM EDT (18:22 UTC)
Expired: Jun 21, 2007, 2:45 PM EDT
In force: 23 min
Issued by: NWS Pittsburgh, PA
Area: Counties, with a storm outline in the text

County Beaver County, PA

The radar

The Pittsburgh radar (KPBZ), 20 km from the middle of the area, began a volume at 18:23 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, 6.4 hours before the alert went out and 37 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1857 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 131 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 Jun 21, 12:47 PM EDT, 1 hour 35 minutes earlier.

Area forecast discussion, Jun 21, 12:47 PM EDT, 1 hour 35 minutes before

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Hazardous weather outlook, Jun 21, 4:46 AM EDT, 9 hours 36 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
446 AM EDT THU JUN 21 2007

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-012-021>023-041-220900-
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-WESTMORELAND-GREENE-FAYETTE-HANCOCK-
BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER-
446 AM EDT THU JUN 21 2007

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

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, Jun 21, 1:41 PM EDT, 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
141 PM EDT THU JUN 21 2007

OHZ041-PAZ007>009-013>016-020>023-030-211845-
ALLEGHENY PA-ARMSTRONG PA-BEAVER PA-BUTLER PA-CLARION PA-COLUMBIANA
OH-FOREST PA-INDIANA PA-JEFFERSON PA-LAWRENCE PA-MERCER PA-VENANGO
PA-WESTMORELAND PA-
141 PM EDT THU JUN 21 2007

...THUNDERSTORMS...

THUNDERSTORMS MOVING ACROSS THE FOLLOWING COUNTIES BETWEEN 145 PM
AND 230 PM...COLUMBIANA...ARMSTRONG...ALLEGHENY...WESTMORELAND...
BEAVER...INDIANA...BUTLER...JEFFERSON...VENANGO...FOREST...
CLARION...MERCER AND LAWRENCE...

AT 132 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED SCATTERED THUNDERSTORMS ACROSS LAWRENCE...MERCER...BUTLER
AND VENANGO COUNTIES. THE STORMS WERE MOVING TO THE SOUTHEAST ABOUT
40 MPH.

BE ALERT FOR GUSTY WINDS TO NEAR 40 MPH, SMALL HAIL, BRIEF HEAVY
DOWNPOURS AND DANGEROUS LIGHTNING.

KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS
APPROACH.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772.

Special weather statement, Jun 21, 2:03 PM EDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
203 PM EDT THU JUN 21 2007

OHZ041-PAZ014-020>023-029>032-WVZ001-211900-
ALLEGHENY PA-ARMSTRONG PA-BEAVER PA-BUTLER PA-COLUMBIANA OH-FAYETTE
PA-GREENE PA-HANCOCK WV-INDIANA PA-WASHINGTON PA-WESTMORELAND PA-
203 PM EDT THU JUN 21 2007

...THUNDERSTORMS CONTINUING TO MOVE ACROSS PARTS OF THE REGION THIS
AFTERNOON...

THUNDERSTORMS WILL BE MOVING INTO BEAVER...ALLEGHENY...WASHINGTON...
AND WESTMORELAND COUNTIES BETWEEN 205 PM AND 300 PM. LOOK FOR SMALL
HAIL...GUSTY WINDS TO NEAR 45 MPH...DANGEROUS LIGHTNING AND BRIEF
HEAVY DOWNPOURS.

THE STORMS WERE MOVING TO THE SOUTHEAST ABOUT 40 MPH.

KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS
APPROACH.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:44 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Westmoreland	61 min
Jun 21, 2:46 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	59 min
Jun 21, 2:48 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	27 min
Jun 21, 2:52 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	53 min
Jun 21, 2:58 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	62 min
Jun 21, 3:16 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	74 min
Jun 21, 3:42 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	63 min
Jun 21, 3:50 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	55 min
Jun 21, 4:01 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	59 min
Jun 21, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	62 min
Jun 21, 4:17 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong	58 min
Jun 21, 4:27 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	63 min
Jun 21, 4:48 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	42 min
Jun 21, 5:00 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	30 min
Jun 21, 5:13 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	32 min
Jun 21, 5:21 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	24 min
Jun 21, 5:24 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	51 min
Jun 21, 2:59 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	61 min
Jun 21, 4:00 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	45 min
Jun 21, 4:37 PM EDT	Severe Thunderstorm Warning	PBZ	Tuscarawas	38 min
Jun 21, 4:51 PM EDT	Severe Thunderstorm Warning	PBZ	Harrison	39 min
Jun 21, 4:59 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	46 min
Jun 21, 3:44 PM EDT	Severe Thunderstorm Warning	PBZ	Hancock	31 min
Jun 21, 7:26 PM EDT	Severe Thunderstorm Warning	PBZ	Tucker	34 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2007 Every severe thunderstorm warning in 2007

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.