Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 156, NWS Pittsburgh, PA

July 18, 2011Greene County, Washington County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 18, 2011, 7:21 PM EDT for Greene County, Washington County, Pennsylvania. It was in force for 39 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: Jul 18, 2011, 7:21 PM EDT (23:21 UTC)
Expired: Jul 18, 2011, 8:00 PM EDT
In force: 39 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Greene County, PA, Washington County, PA

The radar

The Pittsburgh radar (KPBZ), 57 km from the middle of the area, began a volume at 23:23 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 18, 3:57 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 11.4 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: 243 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Jul 18, 7:15 PM EDT, 6 minutes earlier.

Area forecast discussion, Jul 18, 7:15 PM EDT, 6 minutes before

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Hazardous weather outlook, Jul 18, 5:42 PM EDT, 1 hour 39 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PITTSBURGH PA
542 PM EDT MON JUL 18 2011

PAZ009-015-016-022-023-192145-
FOREST-CLARION-JEFFERSON PA-ARMSTRONG-INDIANA-
542 PM EDT MON JUL 18 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST PENNSYLVANIA AND
WEST CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH EARLY
TONIGHT, WITH THE PRIMARY HAZARDS DAMAGING WIND AND LARGE HAIL.
LOCALLY HEAVY RAIN IS ALSO POSSIBLE. LOCATIONS GETTING MORE THAN 2
INCHES IN LESS THAN 3 HOURS CAN DEVELOP FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

APPARENT TEMPERATURES/HEAT INDEX VALUES/ CAN REACH 95 TO 100
EACH AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

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

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007-008-013-014-020-021-
029-031-073>076-WVZ001>004-012-021>023-041-192145-
GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-
JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO-
LAWRENCE-BUTLER-BEAVER-ALLEGHENY-WASHINGTON-GREENE-WESTMORELAND-
WESTMORELAND RIDGES-FAYETTE-FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-
MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER-
542 PM EDT MON JUL 18 2011

...SEVERE THUNDERSTORM WATCH 658 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

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...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH EARLY
TONIGHT, WITH THE PRIMARY HAZARDS DAMAGING WIND AND LARGE HAIL.
LOCALLY HEAVY RAIN IS ALSO POSSIBLE. LOCATIONS GETTING MORE THAN 2
INCHES IN LESS THAN 3 HOURS CAN DEVELOP FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

APPARENT TEMPERATURES/HEAT INDEX VALUES/ CAN REACH 95 TO 100
EACH AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jul 18, 6:06 PM EDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
606 PM EDT MON JUL 18 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     HAIL             CAMBRIDGE               40.02N  81.59W
07/18/2011  E0.88 INCH       GUERNSEY           OH   TRAINED SPOTTER

&&

EVENT NUMBER PBZ1100953

XX

Local storm report, Jul 18, 6:09 PM EDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
609 PM EDT MON JUL 18 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     TSTM WND DMG     RENFREW                 40.81N  79.96W
07/18/2011                   BUTLER             PA   MEDIA

            TREES AND POWER LINES DOWN

&&

EVENT NUMBER PBZ1100954

XX

Local storm report, Jul 18, 6:12 PM EDT, 1 hour 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
612 PM EDT MON JUL 18 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0540 PM     TSTM WND DMG     4 NE ROCHESTER          40.74N  80.23W
07/18/2011                   BEAVER             PA   EMERGENCY MNGR

&&

EVENT NUMBER PBZ1100955

XX

Local storm report, Jul 18, 6:36 PM EDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
636 PM EDT MON JUL 18 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0545 PM     TSTM WND DMG     HANOVERTON              40.76N  80.94W
07/18/2011                   COLUMBIANA         OH   EMERGENCY MNGR

            NUMEROUS TREES DOWN.

&&

EVENT NUMBER PBZ1100956

XX

Local storm report, Jul 18, 6:38 PM EDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
638 PM EDT MON JUL 18 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0535 PM     TSTM WND DMG     4 SW COLUMBIANA         40.84N  80.74W
07/18/2011                   COLUMBIANA         OH   EMERGENCY MNGR

            TREES DOWN ON ROUTE 558

&&

EVENT NUMBER PBZ1100957

XX

Local storm report, Jul 18, 6:39 PM EDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
639 PM EDT MON JUL 18 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0540 PM     TSTM WND DMG     LISBON                  40.77N  80.77W
07/18/2011                   COLUMBIANA         OH   EMERGENCY MNGR

            TREES DOWN ON ROUTE 517

&&

EVENT NUMBER PBZ1100958

XX

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 12:15 PM EDT	Special Weather Statement	PBZ	Venango	60 min
Jul 18, 12:44 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Mercer, Venango	31 min
Jul 18, 1:15 PM EDT	Special Weather Statement	PBZ	Butler, Mercer, Venango	45 min
Jul 18, 2:08 PM EDT	Special Weather Statement	PBZ	Armstrong, Butler, Clarion	37 min
Jul 18, 2:48 PM EDT	Special Weather Statement	PBZ	Butler	57 min
Jul 18, 2:53 PM EDT	Special Weather Statement	PBZ	Indiana	22 min
Jul 18, 3:02 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	28 min
Jul 18, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Butler, Westmoreland	46 min
Jul 18, 4:21 PM EDT	Special Weather Statement	PBZ	Allegheny	39 min
Jul 18, 5:12 PM EDT	Special Weather Statement	PBZ	Allegheny	48 min
Jul 18, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	38 min
Jul 18, 5:39 PM EDT	Special Weather Statement	PBZ	Allegheny	51 min
Jul 18, 5:56 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	34 min
Jul 18, 5:59 PM EDT	Areal Flood Warning	PBZ	Allegheny, Beaver	4 hr
Jul 18, 6:11 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Washington	64 min
Jul 18, 6:47 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	43 min
Jul 18, 7:12 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	48 min
Jul 18, 3:53 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Harrison, Tuscarawas	52 min
Jul 18, 4:55 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Harrison, Tuscarawas	20 min
Jul 18, 5:07 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Harrison, Tuscarawas	38 min
Jul 18, 5:17 PM EDT	Severe Thunderstorm Warning	PBZ	Columbiana	43 min
Jul 18, 5:48 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Noble	42 min
Jul 18, 6:17 PM EDT	Areal Flood Warning	PBZ	Guernsey, Tuscarawas	3 hr
Jul 18, 7:33 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Muskingum	42 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Every severe thunderstorm warning in 2011

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.