An area of thunderstorms with very heavy rain trained over Allegheny and Westmoreland counties causing flash flooding.
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.
An area of thunderstorms with very heavy rain trained over Allegheny and Westmoreland counties causing flash flooding.
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 5, 6:41 PM EST, 5 hours 41 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 741 PM EDT SUN AUG 5 2007 .SYNOPSIS... A WARM FRONT ORIENTED WEST TO EAST WILL REMAIN NEAR THE UPPER OHIO VALLEY FOR MUCH OF THIS WEEK. THIS FRONT WILL MAINTAIN VERY WARM AND HUMID CONDITIONS ACROSS THE AREA ALONG WITH A THREAT OF SHOWERS AND THUNDERSTORMS MOST DAYS. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... SHOWERS HAVE WEAKENED AND BECOME LESS NUMEROUS ACROSS THE FORECAST AREA. WILL KEEP A RISK OF SCATTERED SHOWERS AND A POSSBILE TSTM OVERNIGHT...BUT THUNDER WILL BE PRETTY WIDELY SCATTERED. ADDITONAL RAINFALL OVERNIGHT WILL BE GENERALLY LESS THAN O.25 INCHES. THERE CAN BE PATCHY FOG DEVELOPMENT LATE TONIGHT CONSIDERING THE WET GROUND FROM THE PREVIOUS RAINFALL. && .SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY/... BASED ON RECENT SREF MODEL RUNS, EXPECT PATCHY FOG TO DISSIPATE QUICKLY IN THE MORNING AND CHANCES OF SHOWERS AND THUNDERSTORMS TO BE DECREASING ACROSS THE UPPER OHIO VALLEY MONDAY WITH LITTLE CHANCE MONDAY NIGHT AND TUESDAY. EVEN THOUGH THE WARM FRONT WILL STILL BE LINGERING JUST TO THE SOUTH OF INTERSTATE 70. EXPECT HIGH TEMPERATURES TO REACH THE UPPER 80S MONDAY AND THEN AROUND 90 TUESDAY AS SUGGESTED BY GFS AND NAM MOS VALUES. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... EXPECT CHANCES OF THUNDERSTORMS TO INCREASE TUESDAY NIGHT AS MOST GFS ENSEMBLE MEMBERS SHOW A LOW PRESSURE CENTER MOVING EASTWARD ALONG THE WARM FRONT THROUGH THE GREAT LAKES AND UPPER OHIO VALLEY. AFTER THAT, GFS OPERATIONAL MODEL AND SEVERAL ENSEMBLE MEMBERS SHOW THE NEXT REAL CHANCE OF SHOWERS AND THUNDERSTORMS WILL BE THURSDAY INTO FRIDAY AS ANOTHER LOW PRESSURE CENTER PASSES ALONG THE WARM FRONT AND HUMID AIR MASS STILL HOVERING NEAR THE UPPER OHIO VALLEY. FORECASTED TEMPERATURES WILL BE WARMER THAN NORMAL AS SUPPORTED BY H8 TEMPERATURES NEAR 20C AND HPC AND GFS MOS GUIDANCE. && .AVIATION /00Z MONDAY THROUGH FRIDAY/... RADAR AND SURFACE DATA SHOW SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL MOVE THROUGH THE UPPER OHIO VALLEY OVERNIGHT AND BRING MVFR CONDITIONS AND PERIODIC IFR. MVFR AND ISOLATED IFR CONDITIONS CAN BE EXPTECTED TOWARD DAYBREAK AS FOG FURTHER REDUCES VISIBILITIES. EXPECT VFR CONDITIONS TO BECOME PREVALENT MONDAY AS FOG DISSIPATES AND SHOWER CHANCES DIMINISH. DUE TO HIGH HUMIDITY THERE CAN BE SOME FLIGHT RESTRICTIONS TO MVFR AND ISOLATED IFR SEVERAL LATE NIGHTS THIS WEEK IN FOG AND HAZE. ALSO FOR THE EXTENDED PORTION UNSETTLED WEATHER CONDITIONS WILL BE THE RULE. THUNDERSTORMS TUESDAY NIGHT AND LATE WEEK CAN BRING SCATTERED IFR CONDITIONS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 511 AM EDT SUN AUG 5 2007 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-060915- 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- 511 AM EDT SUN AUG 5 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...MONDAY THROUGH SATURDAY VERY WARM AND HUMID CONDITIONS MONDAY WILL ALLOW SCATTERED THUNDERSTORMS TO FORM NEAR A WARM FRONT. A FEW OF THESE STORMS COULD BE SEVERE WITH DAMAGING WINDS AND POSSIBLE LARGE HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED MONDAY.
The Pittsburgh radar (KPBZ), 17 km away, was scanning. The volume nearest the first event began at 05:22 UTC.
4 flash flood. Local standard time, as filed.
Flash flooding on Lowerys Run along Camp Horne Road and Rochester Road. Rochester Road and Camp Horne closed in spots.
Flash flooding along Girtys Run in Millvale with water in 5 to 10 homes. Some evacuations Millvale.
Law enforcement reported flash flooding with water running into homes in Grapeville.
Water reported in homes due to flash flooding by law enforcement in Adamsburg.
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: 48224, 48225, 48226, 48227.