Scattered severe thunderstorms developed along a slow moving cold front across Western Pennsylvania.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PBZ wrote it up.
Scattered severe thunderstorms developed along a slow moving cold front across Western Pennsylvania.
The local office's own words before the first event, 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 the first event at Aug 23, 12:30 PM EST, 57 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 130 PM EDT THU AUG 23 2007 .SYNOPSIS... HIGH PRESSURE ALOFT WILL MAINTAIN WARM TEMPERATURES ACROSS THE REGION FOR THE REST OF THE WEEK AND CROSSING DISTURBANCES WILL SUPPORT THE CHANCE OF MAINLY AFTERNOON THUNDERSTORMS. A COLD FRONT WILL CROSS THE AREA SATURDAY NIGHT AND SUNDAY...WITH A GREATER CHANCE OF SHOWERS AND THUNDERSTORMS. THE FRONT WILL USHER IN COOLER AND DRIER CONDITIONS FOR EARLY NEXT WEEK. && .NEAR TERM /THROUGH FRIDAY/... ISOLATED CONVECTION THIS EVENING AS SHORTWAVE HEADS EAST THEN HEIGHTS RISE AS UPPER RIDGE NOSES EAST DURING THE DAY FRIDAY. VERY HOT AND HUMID WITH HIGH FRIDAY IN THE MID 90S SOUTH TO NEAR 90 NORTH. HEAT INDEX WILL REACH INTO UPPER 90S FOR A TIME FRIDAY AFTERNOON BUT NOT REACHING ADVISORY CRITERIA. STILL AN ISOLATED STORM POSSIBLE FRIDAY. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/... SCATTERED THUNDERSTORMS...MAINLY NORTH OF PITTSBURGH...WILL DIMINISH FRIDAY EVENING WITH THE DECREASE OF HEATING. BOTH NAM/GFS CONTINUE TO SLOW DOWN THE PROGRESS OF THE COLD FRONT...WITH A SATURDAY NIGHT PASSAGE ACROSS SOUTHWEST PA/EAST CENTRAL OHIO...AND EARLY SUNDAY FOR NORTHERN WV/WESTERN MD. IN ADVANCE OF THE FRONT SATURDAY...ANOTHER ROUND OF AFTERNOON THUNDERSTORMS ARE EXPECTED IN THE UNSTABLE HOT AND HUMID AIRMASS AHEAD OF THE FRONT. WILL CONTINUE THE GREATER CHANCES OF SHWRS/TSTMS SATURDAY NIGHT WITH THE COLD FRONT. PRECIP COVERAGE WILL GRADUALLY DECREASE SUNDAY AS THE COLD FRONT EXITS THE REGION. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... RIDGING WILL BUILD IN BEHIND THE FRONT...BRINGING DRY CONDITIONS THROUGH WEDNESDAY. TEMPERATURES WILL COOL SIGNIFICANTLY FROM THE HOT READINGS THE PREVIOUS FEW DAYS...BUT WILL REMAIN AT OR SLIGHTLY ABOVE NORMAL. THE NEXT SYSTEM WILL APPROACH THE AREA BY THURSDAY...BRINGING A CHANCE OF SHOWERS AND THUNDERSTORMS. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... SOME VFR HAZE ACROSS REGION WITH DEPARTING SCATTERED STORMS NEAR KDUJ AT 18Z. OTHERWISE STILL EXPECT A FEW STRAY STORMS TO DEVELOP THIS AFTERNOON BUT AGAIN NOT ENOUGH COVERAGE TO INCLUDE IN TAFS. MVFR FOG AND HAZE AGAIN TONIGHT WITH A PERIOD OF IFR FOG TOWARD DAYBREAK. ISOLATED THUNDER AT BEST FRIDAY AS HEIGHTS RISE ALOFT. BETTER SHOWER AND THUNDERSTORM CHANCES SATURDAY WILL PERSIST THROUGH SATURDAY WITH IFR CONDITIONS POSSIBLE IN STORMS AS COLD FRONT APPROACHES. FRONT WILL PUSH ACROSS THE REGION BY EARLY SUNDAY WITH GENERAL VFR CONDITIONS UNDER HIGH PRESSURE INTO TUESDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 1236 PM EDT THU AUG 23 2007 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-241000- 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- 1236 PM EDT THU AUG 23 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 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING...ALONG AND SOUTH OF A WARM FRONT STRETCHING ACROSS NORTHERN OHIO AND NORTHWEST PENNSYLVANIA. THE MAIN SEVERE THREAT WILL BE DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1055 AM EDT THU AUG 23 2007 PAZ007-231600- MERCER PA- 1055 AM EDT THU AUG 23 2007 ...THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTY...MERCER... AT 1052 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 15 MILES NORTHWEST OF SHARON...MOVING EAST AT 25 MPH. THESE STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH AND SMALL HAIL. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... KERRS CORNERS...ENTERPRISE...FARRELL...FREDONIA AND GROVE CITY 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 NATIONAL WEATHER SERVICE PITTSBURGH PA 1129 AM EDT THU AUG 23 2007 PAZ014-231615- BUTLER PA- 1129 AM EDT THU AUG 23 2007 ...THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTY...BUTLER... AT 1123 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS OVER MORAINE STATE PARK...MOVING EAST AT 30 MPH. THESE STORMS MAY PRODUCE WIND GUSTS TO 40 MPH AND SMALL HAIL. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BUTLER...CHICORA...EAU CLAIRE...EVANS CITY AND HOOKER 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 State College radar (KCCX), 82 km away, was scanning. The volume nearest the first event began at 18:26 UTC.
10 hail, 5 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Emergency management reported power lines down along route 954 in near the Jefferson county border.
Emergency management reported power lines down along Route 954 near the Indiana county line.
Emergency management reported trees down in Murrysville near the intersection of Murwin and Greensburg roads.
A trained spotter reported penny sized hail.
The public reported nickel size hail in Beaver Falls.
The public reported nickel size hail in Butler.
An off duty NWS employee reported nickel size hail near Cherry Tree.
Emergency management reported trees down in Sarver.
The public reported nickel size hail near Freeport.
The public reported nickel size hail.
An off duty NWS employee reported golf ball size hail near Logans Ferry.
Emergency management reported golf ball size hail east of Homer City.
Emergency management reported Penn Run flooding over Spalding Road.
A trained spotter reported penny size hail near Tarentum.
Emergency management reported trees down on River Road.
Penny size hail was reported near Delmont.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2007Every state in 2007This day in weather historyWarnings in Pennsylvania, August 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 53977, 53978, 53979, 53967, 53968, 53969, 53970, 53980, 53971, 53972, 53973, 53974, 53966, 53975, 53981, 53976.