Three separate mesoscale convective systems moved across Southeast Ohio, Western Pennsylvania, Northern West Virginia, and Garrett county Maryland. Widespread wind damage, flash flooding, and an EF0 tornado occurred during the event.
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.
Three separate mesoscale convective systems moved across Southeast Ohio, Western Pennsylvania, Northern West Virginia, and Garrett county Maryland. Widespread wind damage, flash flooding, and an EF0 tornado occurred during the event. The tornado touched down in the West End of Pittsburgh. Significant flash flooding occurred in Millvale in Allegheny county.
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 9, 12:20 AM EST, 6 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 120 AM EDT THU AUG 9 2007 .SYNOPSIS... A WARM FRONT WILL MAINTAIN VERY WARM AND HUMID CONDITIONS ACROSS THE UPPER OHIO VALLEY INTO FRIDAY, AND BE THE FOCUS FOR SCATTERED THUNDERSTORMS TO DEVELOP. THUNDERSTORMS WILL BE MORE NUMEROUS LATE THIS AFTERNOON INTO TONIGHT WHEN A LOW PRESSURE CENTER ON THE FRONT MOVES THROUGH THE OHIO VALLEY. A COLD FRONT WILL PUSH ACROSS THE DISTRICT FRIDAY USHURING IN COOLER AND DRIER AIR FOR THE WEEKEND && .NEAR TERM /THROUGH TONIGHT/... THUNDERSTORMS WILL INCREASE IN COVERAGE AND INTENSITY LATE THIS AFTERNOON INTO TONIGHT WITH AMPLE LOW LEVEL MOISTURE COMBINED WITH THE HEATING OF THE DAY. SOME STORMS MAY BE SEVERE WITH DAMAGING THUNDERSTORM WIND GUSTS POSSIBLE. HIGH PRECIPITABLE WATER AMOUNTS WILL SUPPORT HEAVY DOWNPOURS AND COULD LEAD TO FLASH FLOODING IN AREAS WHERE SHOWERS PERSIST. && .SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/... COLD FRONT MOVING EAST OF THE DISTRICT BY FRIDAY DAYBREAK WILL BRING COOLER AND DRIER AIR INTO THE FORECAST AREA BY FRIDAY AFTERNOON. SOME SHOWERS MAY PERSISTS BEHIND THE FRONT FRIDAY MORNING BEFORE ENDING AS THE FRONT MOVES EAST. A RIDGE OF HIGH PRESSURE BUILDING INTO THE DISTRICT BEHIND THE FRONT FRIDAY NIGHT WILL BE LOWER HUMIDITY AND MORE SEASONABLE TEMPERATURES. && .LONG TERM /SATURDAY THROUGH WEDNESDAY/... BOTH RECENT GFS AND ECMWF MODEL RUNS SHOW AN UPPER LEVEL RIDGE REMAINING ACROSS THE PLAINS STATES INTO EARLY NEXT WEEK. THIS SCENARIO WILL MAINTAIN SEASONABLE VALUES OF TEMPERATURE AND HUMIDITY ACROSS THE UPPER OHIO VALLEY THESE DAYS IN CONCERT WITH HPC GUIDANCE AND GFS OPERATIONAL MOS VALUES. SINCE MODELS SHOWED NO CONSENSUS ON ANY SMALLER SCALE SYSTEMS PROVIDING PERIODS OF ORGANIZED LIFT, NO MENTION OF SHOWERS AND THUNDERSTORMS WAS INCLUDED. && .AVIATION /07Z TODAY THROUGH WEDNESDAY/... FOR THE MOST PART...VFR CONDITIONS ARE EXPECTED FOR THE SHORT TERM FORECAST. VERY SIMILAR SETUP AS THE LAST 3 DAYS. TWO AREAS OF TRW OVER E OH WILL CONTINUE TO MOVE SLOWLY EASTWARD AND DISSIPATE THROUGH 09Z. LOCATIONS WHICH EXPERIENCE THESE STORMS WILL SEE VIS DROPPING BLO 3SM AND BKN-OVC MID DECK. ONCE THIS AREA CLEARS WILL SEE A PERIOD OF CLEAR SKIES WHICH WILL ALLOW FOR FOG TO CONTINUE TO DEVELOP. MOST LOCATIONS AGAIN IN THE 3 TO 5 SM RANGE WITH FOG PRONE AREAS AOB 1SM. ANOTHER AREA OF MID DECK WILL BEGIN TO COVER THE AREA AROUND 12Z. EXPECTING TO SEE A COUPLE OF PERIODS OF ACTIVITY TODAY. MODELS INDICATING THE FIRST MOVING THROUGH LATE MORNING EARLY AFTERNOON WITH THE STRONGEST ACTIVITY OVER NORTHERN HALF OF THE AREA. THE SECOND WILL BE WITH THE MAIN FRONT LATE AFTERNOON INTO EARLY FRIDAY MORNING. THE FIRST AREA WILL BE MOVING IN A WEST TO EAST MANNER WITH THE SECOND NW TO SE. WITH CURRENT ATMOSPHERE ALL STORMS WILL HAVE CHANCE TO REACH SEVERE LEVELS. FRONT FINALLY CLEARS THE AREA BY FRIDAY AFTERNOON BRINGING IN DRIER AIR FOR THE WEEKEND. THE NEXT CHANCE FOR ACTIVITY WILL COME MONDAY WITH NEXT FRONT. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 500 AM EDT THU AUG 9 2007 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-100900- 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- 500 AM EDT THU AUG 9 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 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON INTO TONIGHT. THE PRIMARY SEVERE WEATHER THREAT WILL BE DAMAGING THUNDERSTORM WINDS. THERE IS ALSO A RISK OF FLASH FLOODING THIS AFTERNOON INTO TONIGHT WHERE HEAVY DOWNPOURS PERSIST. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON INTO TONIGHT.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 559 AM EDT THU AUG 9 2007 OHZ041-091100- COLUMBIANA OH- 559 AM EDT THU AUG 9 2007 ...THUNDERSTORMS... STRONG THUNDERSTORMS TO MOVE THROUGH COLUMBIANA COUNTY... AT 547 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 2 MILES NORTHEAST OF HOMEWORTH...MOVING EAST AT 30 MPH. THESE STORMS WILL CONTAIN VERY HEAVY DOWNPOURS...FREQUENT CLOUD TO GROUND LIGHTNING STRIKES AND HAIL. WIND GUSTS IN EXCESS OF 40 MPH ARE POSSIBLE. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BEAVER CREEK STATE PARK...COLUMBIANA...GUILFORD LAKE STATE PARK... HOMEWORTH...LEETONIA...LISBON AND SALEM 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 631 AM EDT THU AUG 9 2007 PAZ007-091130- MERCER PA- 631 AM EDT THU AUG 9 2007 ...THUNDERSTORMS... STRONG THUNDERSTORMS TO MOVE THROUGH NORTHERN MERCER COUNTY... AT 622 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 14 MILES NORTHWEST OF FREDONIA...OR ABOUT 12 MILES NORTH OF SHARON...MOVING EAST AT 30 MPH. THESE STORMS WILL CONTAIN VERY HEAVY DOWNPOURS...FREQUENT CLOUD TO GROUND LIGHTNING AND HAIL. WIND GUSTS IN EXCESS OF 40 MPH ARE POSSIBLE. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... FREDONIA...MAURICE K GODDARD STATE PARK AND STONEBORO 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 652 AM EDT THU AUG 9 2007 PAZ020-091115- BEAVER PA- 652 AM EDT THU AUG 9 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE BEAVER COUNTY. AT 644 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 8 MILES NORTHWEST OF BLACKHAWK... MOVING SOUTHEAST AT 35 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... ALIQUIPPA...BEAVER...BEAVER FALLS...BLACKHAWK...ECONOMY BORO... FOMBELL...HARSHAVILLE...RACCOON CREEK STATE PARK AND SHIPPINGPORT 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 704 AM EDT THU AUG 9 2007 OHZ041-091130- COLUMBIANA OH- 704 AM EDT THU AUG 9 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVING THROUGH COLUMBIANA COUNTY. AT 656 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS OVER BEAVER CREEK STATE PARK...MOVING EAST AT 35 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BEAVER CREEK STATE PARK...COLUMBIANA...EAST LIVERPOOL...EAST PALESTINE...EAST ROCHESTER...GUILFORD LAKE STATE PARK... HOMEWORTH...LEETONIA...LISBON...MILLPORT...SALEM...SALINEVILLE 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. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 716 AM EDT THU AUG 9 2007 PAZ021-091215- ALLEGHENY PA- 716 AM EDT THU AUG 9 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH ALLEGHENY COUNTY. AT 720 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED THUNDERSTORMS BETWEEN SEWICKLEY AND DOWNTOWN PITTSBURGH. ANOTHER ROUND OF STRONGER THUNDERSTORMS WERE IN BEAVER COUNTY 12 MILES NORTHWEST OF MOON...OR ABOUT OVER SHIPPINGPORT...ALSO MOVING SOUTHEAST AT 35 MPH. EXPECT TORRENTIAL DOWNPOURS AND FREQUENT LIGHTNING WITH THESE STORMS THEY MOVE THROUGH ALLEGHENY COUNTY THROUGH 830 AM. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BALDWIN...BETHEL PARK...BRIDGEVILLE...CARNEGIE...DOWNTOWN PITTSBURGH...ELIZABETH BORO...FOX CHAPEL...FRANKLIN PARK... GIBSONIA...IMPERIAL...JEFFERSON BORO...MCDONALD...MCKEES ROCKS... MCKEESPORT...MONROEVILLE...MOON...MOUNT LEBANON...NATRONA HEIGHTS...NORTH SIDE...OAKDALE...PENN HILLS...PERRYSVILLE...PLUM... RUSSELLTON......SOUTH SIDE...SPRINGDALE...TURTLE CREEK... UPPER SAINT CLAIR...WEST MIFFLIN...WEXFORD AND WILKINSBURG 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. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND CREEKS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. FREQUENT LIGHTNING IS REPORTED WITH THESE STORMS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 755 AM EDT THU AUG 9 2007 PAZ030-091245- WESTMORELAND PA- 755 AM EDT THU AUG 9 2007 ...THUNDERSTORMS TO MOVE THROUGH WESTMORELAND COUNTY... AT 753 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 5 MILES SOUTHWEST OF NEW KENSINGTON... OR ABOUT OVER PENN HILLS...MOVING SOUTHEAST AT 35 MPH. EXPECT TORRENTIAL DOWNPOURS AS THESE STORMS MOVE THROUGH 9 AM. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... DELMONT...DERRY...DONEGAL...DONORA...GREENSBURG...IRWIN... JEANNETTE...LATROBE...LAUREL MOUNTAIN STATE PARK...LIGONIER... MONESSEN...MURRYSVILLE...NEW ALEXANDRIA...NEW FLORENCE...NEW KENSINGTON...NEW STANTON...SALTSBURG...WEST NEWTON... HARRISON CITY...RUFFS DALE...STAHLSTOWN AND WHITNEY 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. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. FREQUENT LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
The Pittsburgh radar (KPBZ), 43 km away, was scanning. The volume nearest the first event began at 11:58 UTC.
28 thunderstorm wind, 20 flash flood, 4 heavy rain, 2 hail, 1 tornado. Local standard time, as filed.
Emergency management reported numerous trees and power lines down.
Public measured 2.51 inches of rain in over an hour.
A trained spotter reported 3.57 inches of rain in 2 hours.
Emergency management reported widespread trees down across Lower Burrell.
Law enforcement reported trees and power lines down northeast of Leechburg.
A trained spotter reported Sandt Creek out of its banks flooding portions of Rodi road. Numerous basements with up to three feet of water in them from poor drainage flooding around 3rd street in Penn Hills.
Public reported streams over roads and bridges in Verona.
A trained spotter reported Girtys Run creek is out of its banks and flooding portions of Babcock Blvd and other roads in the area.
A trained spotter reported 1.50 inches of rainfall in 45 minutes. Flooding was reported along South Main Street.
Emergency management reported numerous trees down in the Saltsburg and Clarksburg areas.
Emergency management reported widespread flash flooding in both Export and Murrysville areas.
Emergency management reported numerous trees and power lines down in Murrysville and near Export.
Emergency management reported flash flooding on RT 22 closing the highway.
Emergency management reported trees down on RT 218 in Waynesburg.
Emergency management reported trees down in the town of Beaver and in much of the county.
Emergency management reported trees and wires down in Uniontown and across the county.
An NWS Survey found and EF0 tornado touched down in the West End area of Pittsburgh affecting areas along Toledo, Municipal, and Greenway Streets. Numerous trees were snapped and power lines were down. There was some structural damage to a few homes and buildings. Maximum estimated winds were 85 MPH.
Emergency management reported trees and power lines down near the Ross Park Mall.
A microburst hit the Uptown section of Pittsburgh with damage from along Fifth Street to Moultrie Street. Numerous buildings had structural damage with walls of several buildings collapsed and roofs torn off. Several buildings also has windows broken and siding torn off. Trees were also snapped off. The damage extended for about 700 yards and was 400 yards wide.
The public reported hail of 1.00 inch diameter in Pittsburgh.
Amateur radio reported trees down on East Carson Street as well as in the vicinity of Forbes and Braddock.
Heavy rain caused flash flooding in the Millvale area and much of the North Hills area of Pittsburgh as Girtys Run came out of it's banks. Over 900 homes were affected by the flooding as well as over 200 businesses. Infrasturcture owned by local municipalities sustained over 4 million dollars in damage.
Emergency management reported structural damage to buildings around Cecil.
Emergency management reported trees down in Washington and across the county.
Public reported large branches down in Mount Pleasant.
A trained spotter reported several trees and power lines down in Latrobe.
Emergency management reported flash flooding closing Route 18 between Greengarden RD and Route 151.
A trained spotter reported 3.03 inches of rainfall in one hour and 35 minutes.
Emergency management reported trees and wires down in Amwell Township.
Emergency management reported flash flooding closing roads in Uniontown.
Emergency management reported flash flooding closing roads in Latrobe.
Emergency management reported numerous trees and large branches down in Waynesburg and across the county.
Emergency management reported trees down in Latrobe and countywide.
Emergency management reported trees down in Uniontown and in several other spots in the county.
Emergency management reported flash flooding on RT 51 closing the road between the Aliquippa Bridge and Monaca.
Amateur radio reported Mcnight road closed due to flash flooding.
Amateur radio reported trees down in Greensburg.
Emergency management reported water in 4 houses in Allenport due to flash flooding.
Emergency management reported flash flooding closing numerous roads in Brownsville.
Emergency management reported flash flooding closing roads in Ellsworth.
Emergency management reported Almond RD bridge flooded in Ellsworth.
A trained spotter reported 24 hour rainfall amount of 3.15 inches.
Emergency management reported trees down north of Ellwood City.
Newspaper reported trees down on RT 588 northeast of Beaver Falls.
Emergency management reported flash flooding along Route 51 between the Aliquippa bridge and Monaca.
Emergency management reported trees and wires down in Shaler TWP.
Emergency management reported flash flooding closing some roads in Wilkinsburg.
Emergency management reported trees down in Penn Hills.
Emergency management reported trees down north of Ellwood City.
Public reported trees and large limbs down east of Waynesburg.
Emergency management reported trees down around Marianna.
Public reported several roads closed due to flash flooding in Connellsville.
Emergency management reported water in a home due to flash flooding in Newell.
Emergency management reported numerous trees down in Connellsville and across northern and eastern part of the county.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2007Every state in 2007This day in weather historyThe tornado archive for Pennsylvania, 2007Warnings 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: 53745, 53740, 53741, 53746, 53747, 53715, 53716, 53720, 53721, 53748, 53722, 53749, 53723, 53765, 53766, 53750, 53744, 53751, 53767, 53738, 53752, 53724, 53753, 53768, 53754, 53755, 53725, 53742, 53756, 53726, 53727, 53757, 53758, 53769, 53770, 53729, 53771, 53730, 53731, 53732, and more.