Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 171, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 26, 2007, 2:08 PM EDT for Beaver County, Pennsylvania. It was in force for 67 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 26, 2007, 2:08 PM EDT (18:08 UTC)
- Expired
- Jul 26, 2007, 3:15 PM EDT
- In force
- 67 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 18:09 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, 6.1 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.
- Mixed-layer CAPE
- 261 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 816 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 26, 10:34 AM EDT, 3 hours 34 minutes earlier.
Area forecast discussion, Jul 26, 10:34 AM EDT, 3 hours 34 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1034 AM EDT THU JUL 26 2007 .SYNOPSIS... A LOW PRESSURE SYSTEM ALOFT OVER OHIO WILL CONTINUE TO CAUSE UNSETTLED CONDITIONS OVER THE UPPER OHIO VALLEY INTO THE WEEKEND WITH SCATTERED SHOWERS AND THUNDERSTORMS MAINLY OCCURRING IN THE AFTERNOON AND NIGHTTIME HOURS. THE LOW WILL DEPART BY EARLY NEXT WEEK WITH DRIER CONDITIONS TO FOLLOW. && .NEAR TERM /THROUGH TONIGHT/... ZONES UPDATED TO REMOVE MORNING FOG. REMAINDER STAYS THE SAME. RECENT RUC MODEL RUNS SHOW THE UPPER LEVEL CLOSED LOW CENTER WILL STAY OVER OHIO TODAY. RECENT RADAR DATA SHOWS SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS AROUND THE PERIPHERY OF THE CIRCULATION, AFFECTING PARTS OF EAST CENTRAL OHIO AND NORTHERN WEST VIRGINIA THIS MORNING. WITH LOWLEVEL SOUTHERLY WINDS ADVECTING ADDED MOISTURE INTO THE UPPER OHIO VALLEY, EXPECT COVERAGE OF SHOWERS AND THUNDERSTORMS TO INCREASE THIS AFTERNOON AND TONIGHT, BUT STILL BE LARGELY SCATTERED. CONCUR WITH GFS MOS THAT HIGH TEMPERATURES WILL BE THE SAME OR SLIGHTLY HIGHER THAN YESTERDAY. TONIGHTS LOWS WILL BE SEVERAL DEGREES WARMER DUE TO THE INCREASE IN HUMIDITY. THIS MAY CAUSE AN INCREASE IN LATE NIGHT FOG COVERAGE AS WELL. && .SHORT TERM /FRIDAY THROUGH SATURDAY/... MORE OF THE SAME INTO THE WEEKEND AS THE TROUGH WILL BEGIN TO MOVE EASTWARD PASSING THROUGH THE AREA FRIDAY AND SATURDAY. MORE WIDESPREAD ACTIVITY IS EXPECTED FRI AND SAT AS SFC LOW MOVES ACROSS INDIANA FRIDAY AND SLOWLY PIVOTS ACROSS THE CWA ON SAT. MODELS SHOWING SOME HEAVIER ACTIVITY POSSIBLE FRIDAY AFTERNOON AND THEN AGAIN ON SAT AFTERNOON. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... SYSTEM WILL BE SLOW TO EXIT THE AREA...NOT MOVING INTO EASTERN PA UNTIL SUNDAY AFTERNOON. THIS WILL KEEP TRW IN THE AREA SAT NIGHT AND SUNDAY. AREA SHOULD FINALLY DRY OUT MONDAY AS ENTIRE SYSTEM MOVES TOWARD THE EAST COAST. HIGH PRESSURE BUILDS IN TUE AND WED. && .AVIATION /15Z THURSDAY THROUGH MONDAY/... FOR TODAY AND TONIGHT, RUC, NAM AND GFS MODEL RUNS EACH SHOW THE UPPER LEVEL CLOSED LOW CENTER, AND ITS ASSOCIATED UPPER LEVEL COLDNESS AND INSTABILITY, REMAINING SITUATED OVER EASTERN OHIO. SO EXPECT NOT MUCH CHANGE IN CONDITIONS FROM PREVIOUS DAYS. FOR TODAY, EARLY MORNING VISIBILITY RESTRICTIONS IN FOG WILL END BY 13Z DUE TO INCREASED BOUNDARY LAYER VERTICAL MIXING. THEN EXPECT CUMULUS FORMATION BY MID MORNING (BKN050) AND WINDS GENERALLY FROM THE SOUTH AT 5-8KTS. COVERAGE OF SHOWERS AND THUNDERSTORMS MAY BE INCREASED TODAY AS SOUTHERLY WINDS BEGIN TO BRING HIGHER HUMIDITY VALUES. TONIGHT, AS WINDS LESSEN AND BECOME LIGHT, LATE NIGHT PATCHY FOG CAN INDUCE LOCAL MVFR AND ISOLATED IFR VISIBILITIES UNDER GENERALLY AN ALTOCUMULUS CLOUD LAYER (BKN120). THE COVERAGE OF AFTERNOON INSTABILITY SHOWERS AND THUNDERSTORMS SHOULD INCREASE FURTHER FRIDAY AND BE GREATEST SATURDAY AS AN UPPER LEVEL SHORT-WAVE IMPULSE FROM THE NORTHWEST BEGINS TO INTERACT WITH CLOSED UPPER LOW. SO ALTHOUGH VFR FLIGHT CONDITIONS WILL BE MAINTAINED MOST OF THE TIME STILL ON FRIDAY INTO SATURDAY, THERE CAN BE PERIODS OF MVFR-IFR FLIGHT CONDITIONS IN PRECIPITATION AND POST-PRECIPITATION FOG. PRECIPITATION COVERAGE SUNDAY SHOULD BE LESS AS THE SYSTEMS BEGIN TO EXIT EAST OF THE UPPER OHIO VALLEY AND MONDAY SHOULD BE MAINLY VFR DUE TO INFLUX OF POST-SYSTEM DRYNESS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
Hazardous weather outlook, Jul 26, 12:24 PM EDT, 1 hour 44 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 1224 PM EDT THU JUL 26 2007 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-271630- 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- 1224 PM EDT THU JUL 26 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...THIS AFTERNOON AND TONIGHT THE NATIONAL WEATHER SERVICE SAYS THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EARLY TONIGHT WITH THE PRIME THREAT BEING LARGE HAIL AND DAMAGING WIND. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THE NATIONAL WEATHER SERVICE SAYS THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FRIDAY WITH THE PRIME THREATS LARGE HAIL AND DAMAGING WIND. THUNDERSTORMS FRIDAY AND SATURDAY CAN ALSO PRODUCE HEAVY RAINFALL. LOCATIONS GETTING MORE THAN 2 INCHES OF RAIN IN A COUPLE HOURS CAN DEVELOP FLOOD PROBLEMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED.
In the hours before
Local storm report, Jul 26, 1:02 PM EDT, 1 hour 6 minutes before
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</html>Special weather statement, Jul 26, 1:26 PM EDT, 42 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 126 PM EDT THU JUL 26 2007 OHZ041-PAZ020-261825- BEAVER PA-COLUMBIANA OH- 126 PM EDT THU JUL 26 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... COLUMBIANA AND BEAVER... AT 125 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS BETWEEN SALINEVILLE AND HIGHLANDTOWN IN COLUMBIANA COUNTY...MOVING NORTHEAST AT 20 MPH. THESE STORMS COULD CONTAIN HAIL UP TO A HALF INCH IN DIAMETER AND WINDS GUSTING UP TO 35 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BLACKHAWK...BEAVER CREEK STATE PARK...EAST PALESTINE AND WELLSVILLE. 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 26, 2:04 PM EDT, 4 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 204 PM EDT THU JUL 26 2007 OHZ041-PAZ013-020-261900- BEAVER PA-COLUMBIANA OH-LAWRENCE PA- 204 PM EDT THU JUL 26 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... COLUMBIANA...BEAVER AND LAWRENCE... AT 155 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 2 MILES SOUTHEAST OF BEAVER CREEK STATE PARK...MOVING NORTHEAST AT 20 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BLACKHAWK...ELLWOOD CITY...NEW CASTLE...NEW WILMINGTON...BEAVER CREEK STATE PARK AND EAST PALESTINE 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 |
|---|---|---|---|---|
| Jul 26, 3:17 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 18 min |
| Jul 26, 1:54 PM EDT | Severe Thunderstorm Warning | PBZ | Columbiana | 51 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2007Every 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.