Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 142, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 21, 2008, 9:35 PM EDT for Fayette County, Westmoreland County, Pennsylvania; Preston County, West Virginia. It was in force for 55 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 21, 2008, 9:35 PM EDT (01:35 UTC)
- Expired
- Jul 21, 2008, 10:30 PM EDT
- In force
- 55 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
Counties Fayette County, PA, Westmoreland County, PA, Preston County, WV
The radar
The Pittsburgh radar (KPBZ), 88 km from the middle of the area, began a volume at 01:35 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 00:00Z, 1.6 hours before the alert went out and 71 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.
- Mixed-layer CAPE
- 489 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1419 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
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 21, 2:36 PM EDT, 6 hours 59 minutes earlier.
Area forecast discussion, Jul 21, 2:36 PM EDT, 6 hours 59 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 236 PM EDT MON JUL 21 2008 .SYNOPSIS... LOW PRESSURE WILL AFFECT THE REGION INTO WEDNESDAY...BRINGING SCATTERED SHOWERS AND THUNDERSTORMS. HIGH PRESSURE WILL BRING DRIER AND COOLER CONDITIONS FOR THE LAST HALF OF THE WEEK. && .NEAR TERM /THROUGH TUESDAY/... SCATTERED SHOWERS AND THUNDERSTORMS ARE DEVELOPING ACROSS NW PA CLOSE TO THE SURFACE FRONTAL BOUNDARY...AND ACROSS EASTERN OHIO IN ADVANCE OF A SHORTWAVE. AS THE WAVE CONTINUES TO APPROACH...THE CONVECTIVE ACTIVITY WILL SPREAD SOUTH AND EAST ACROSS SW PA AND POINTS SOUTH BY LATE THIS AFTN. WITH SUFFICIENT DEEP LAYER SHEAR...A FEW STORMS COULD PRODUCE GUSTY/LOCALLY SEVERE WIND GUSTS THROUGH THIS EVENING. ACTIVITY WILL DECREASE OVERNIGHT WITH AREAS OF LOW CLOUDS/FOG IN THE VALLEYS BY SUNRISE. THE NEXT WAVE WILL CROSS THE AREA TUESDAY...BRINGING THE NEXT ROUND OF SCATTERED SHWRS/TSTMS. && .SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/... THE UPPER LEVEL LOW WILL CROSS THE LOWER GREAT LAKES TUESDAY NIGHT/WEDNESDAY. WITH THE SURFACE BOUNDARY MOVING TO THE SOUTH...THINK PRECIP COVERAGE WILL DECREASE...ENDING ACROSS OHIO AND NW PA WEDNESDAY...AND ACROSS THE RIDGES WEDNESDAY NIGHT. HIGH PRESSURE WILL BUILD INTO THE REGION THURSDAY FOR DRY AND SEASONABLY COOL CONDITIONS. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... HIGH PRESSURE WILL BRING DRY WEATHER AND COOLER TEMPERATURES THROUGH FRIDAY. ANOTHER SERIES OF VORTICITY MAXES ROTATE INTO THE EASTERN LONG WAVE POSITION OVER THE WEEKEND. 12Z GFS AND 00Z ECMWF COMING INTO BETTER AGREEMENT ON FRONTAL TIMING LATE SATURDAY WITH POSSIBILITY OF SECONDARY IMPULSE ON SUNDAY. WILL KEEP CHANCE OF SHOWERS THROUGH THE WEEKEND WITH BEST CHANCE SATURDAY AFTERNOON AND EVENING. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... CLOUD TOPS CONTINUE TO WARM ON THE AREA OF THUNDERSTORMS IN NORTHWEST OHIO. HOWEVER SOME CONVECTION IS BREAKING OUT AHEAD OF THE ORIGINAL AREA OF THUNDERSTORMS. NEW COMPLEX BLOSSOMING IN SOUTHERN INDIANA WILL LIKELY BLOCK MOISTURE FOR NORTHERN AREA AND LIMIT SEVERITY OF STORMS TO THE NORTH. SCATTERED NORTHERN TSTMS ARE BREAKING OUT AHEAD OF THE NORTHERN AREA AND HAVE PLACED 2-3 HOUR PERIOD OF THUNDERSTORMS WITH IFR CONDS AND GUSTS TO 40KTS IN ALL TERMINALS THIS EVENING. EXPECT TSTMS TO REACH ZZV AROUND 19Z... WESTERN PA BORDER AROUND 21Z...LBE-DUJ LINE BY 23Z. CONDITIONS LOWERING TO MVFR VISIBILITY AFTER 06Z AND IFR CIGS AND VISIBILITIES AROUND SUNRISE. CONDITIONS IMPROVING TO VFR 15-16Z. ANOTHER VORT MAX ROTATING THROUGH THE FLOW WILL BRING ANOTHER ROUND OF THUNDERSTORMS LATE TUES AND TUESDAY NIGHT. THUNDERSTORMS MAY LINGER INTO WEDNESDAY MORNING AT EASTERN TERMINALS...OTHERWISE DRY CONDITIONS THROUGH FRIDAY WITH MORNING FOG POSSIBLE WEDNESDAY AND THURSDAY. NEXT FRONT APPROACHES REGION LATE SATURDAY WITH CHANCE OF THUNDERSTORMS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
Hazardous weather outlook, Jul 21, 4:16 AM EDT, 17 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 416 AM EDT MON JUL 21 2008 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-220830- 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- 416 AM EDT MON JUL 21 2008 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 A STALLED FRONTAL BOUNDARY WILL BE THE FOCUS FOR THUNDERSTORMS WHICH MAY BE SEVERE THIS AFTERNOON AND TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SCATTERED THUNDERSTORMS WILL DEVELOP TUESDAY AND ISOLATED STORMS COULD BE SEVERE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Special weather statement, Jul 21, 7:15 PM EDT, 2 hours 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 715 PM EDT MON JUL 21 2008 OHZ041-PAZ020-021-029-WVZ001-220015- ALLEGHENY PA-BEAVER PA-COLUMBIANA OH-HANCOCK WV-WASHINGTON PA- 715 PM EDT MON JUL 21 2008 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... COLUMBIANA...WASHINGTON...ALLEGHENY...BEAVER AND HANCOCK... AT 711 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS OVER EAST LIVERPOOL...MOVING EAST AT 34 MPH. THESE STORMS ARE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS AROUND 40 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... ALIQUIPPA...ALLISON PARK...BESSEMER...BLACKHAWK...CARNEGIE... DOWNTOWN PITTSBURGH...ECONOMY BORO...FOX CHAPEL...FRANKLIN PARK... HARSHAVILLE...IMPERIAL...LEECHBURG...MCKEES ROCKS...MCKEESPORT AND MONROEVILLE 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, Jul 21, 7:43 PM EDT, 1 hour 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 743 PM EDT MON JUL 21 2008 OHZ049-050-059-WVZ003-220045- BELMONT OH-HARRISON OH-JEFFERSON OH-OHIO WV- 743 PM EDT MON JUL 21 2008 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... BELMONT...HARRISON...JEFFERSON AND OHIO... AT 741 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 5 MILES NORTHEAST OF PIEDMONT...MOVING SOUTHEAST AT 43 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... ADENA...BELLAIRE...BRIDGEPORT...CADIZ...CLENDENING...DILLONVALE... FLUSHING...JUG RUN...MARTINS FERRY...NEW ATHENS...PIEDMONT... RAYLAND...SAINT CLAIRSVILLE...TILTONSVILLE AND YORKVILLE THESE STORMS ARE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS BETWEEN AROUND 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.
Local storm report, Jul 21, 8:27 PM EDT, 1 hour 8 minutes before
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</html>Local storm report, Jul 21, 8:33 PM EDT, 1 hour 2 minutes before
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</html>Local storm report, Jul 21, 9:03 PM EDT, 32 minutes before
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</html>Local storm report, Jul 21, 9:13 PM EDT, 22 minutes before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 8:12 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Westmoreland | 63 min |
| Jul 21, 8:33 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Fayette, Washington, Westmoreland | 57 min |
| Jul 21, 8:47 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Greene, Washington | 58 min |
| Jul 22, 3:39 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 66 min |
| Jul 22, 7:05 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 26 min |
| Jul 22, 7:06 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 54 min |
| Jul 22, 7:55 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence | 65 min |
| Jul 22, 5:07 AM EDT | Severe Thunderstorm Warning | PBZ | Monroe, Noble | 38 min |
| Jul 21, 10:23 PM EDT | Severe Thunderstorm Warning | PBZ | Preston, Tucker | 67 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2008Severe Thunderstorm Warnings in West Virginia, 2008Every severe thunderstorm warning in 2008
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.