Scattered severe thunderstorms developed in eastern Ohio and western Pennsylvania ahead of a cold front moving across the Ohio Valley.
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 in eastern Ohio and western Pennsylvania ahead of a cold front moving across the Ohio Valley.
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 10, 1:30 PM EST, 2 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 230 PM EDT MON AUG 10 2009 .SYNOPSIS... A SLOW MOVING COLD FRONT WILL CAUSE SHOWERS AND THUNDERSTORMS THROUGH TUESDAY. SOME OF THE STORMS MAY BECOME SEVERE LATER THIS AFTERNOON AND EVENING...WITH A POTENTIAL FOR DAMAGING WINDS AND HEAVY RAINFALL. DRY WEATHER WILL RETURN BY MID WEEK. && .NEAR TERM /THROUGH TONIGHT/... SCATTERED THUNDERSTORMS ARE CURRENTLY DEVELOPING ALONG AXIS OF WEAK MOISTURE CONVERGENCE...RUNNING FROM SOUTHERN PART OF CWA SOUTHWEST ACROSS PARTS OF NORTHERN WV. THESE STORMS WILL CONTINUE TO PUSH NORTHEAST ALONG AN AXIS JUST SOUTH AND EAST OF PITTSBURGH BUT SHOULD REMAIN LESS THAN SEVERE. STRONGER THUNDERSTORMS ARE BEGINNING TO DEVELOP ACROSS LAKE ERIE AND NW PA ALONG AN AXIS OF STRONGER CONVERGENCE AND VERY UNSTABLE AIR AHEAD OF A SLOW MOVING COLD FRONT.THIS AREA IS CURRENTLY PRIMED FOR DEVELOPMENT AS THE AFTERNOON PROGRESSES...AND COULD BECOME THE FOCUS FOR SEVERE STORMS LATER THIS AFTERNOON THROUGH THIS EVENING. THE GREATEST THREAT FROM SEVERE STORMS WILL BE WIND DAMAGE...BUT ABUNDANT MOISTURE WILL ALSO FAVOR HEAVY LOCAL RAINS. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY/... STRONGEST STORMS SHOULD DIMINISH AFTER SUNSET BUT A THREAT OF SHOWERS WILL CONTINUE OVERNIGHT AS ANOTHER SHORTWAVE MOVES ACROSS THE AREA IN ASSOCIATION WITH THE SLOW MOVING FRONT. ADDITIONAL STRONG STORMS ARE POSSIBLE ON TUESDAY BEFORE THE FRONT FINALLY CLEARS THE AREA LATE TUESDAY. DRY WEATHER WILL RETURN TO THE REGION TUESDAY NIGHT AS THE FRONT MOVES EASTWARD TO THE MID ATLANTIC STATES. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... MODELS ARE IN AGREEMENT WITH A FORECAST OF DRY AND WARM WEATHER FROM MID WEEK THROUGH THE WEEKEND. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... AREA OF THUNDERSTORMS MOVING ACROSS SOUTHERN THIRD OF CWA THIS AFTERNOON IN ASSOCIATION WITH H5 SHORTWAVE. ONLY TERMINAL LIKELY TO BE AFFECTED IS MGW WITH CHANCE OF THUNDERSTORMS FROM 19-21Z. A STRONGER LINE OF CONVECTION DEVELOPING IN LAKE ERIE AHEAD OF APPROACHING COLD FRONT. EXPECT THIS TO MOVE SOUTHEAST ACROSS CWA THIS EVENING BETWEEN 10/22Z-11/03Z. THUNDERSTORMS SHOULD BE DISSIPATING BY MIDNIGHT WITH STRATUS AND FOG FORECAST FORMING LATE TONIGHT. EXPECT FAIRLY WIDESPREAD IFR CONDITIONS IN FOG AROUND SUNRISE. COLD FRONT WILL BE LOCATED IN NORTHWEST PA AROUND DAYBREAK AND VCNTY OF PIT BY MID AFTERNOON. THUNDERSTORMS LIKELY TO FOR ACROSS SOUTHERN PA AND NORTHERN WV TUESDAY AFTERNOON. UPPER RIDGE BUILDS BACK OVER REGION FROM WEDNESDAY THROUGH FRIDAY WITH GENERALLY VFR CONDITIONS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 325 PM EDT MON AUG 10 2009 OHZ039>041-048-PAZ007>009-013>016-020-022-111930- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-MERCER-VENANGO-FOREST- LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ARMSTRONG- 325 PM EDT MON AUG 10 2009 ...SEVERE THUNDERSTORM WATCH 695 IN EFFECT UNTIL 11 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA AND WEST CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MDZ001-OHZ049-050-057>059-068-069-PAZ021-023-029>032-WVZ001>004-012- 021>023-041-111930- GARRETT-HARRISON-JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE- MONROE-ALLEGHENY-INDIANA-WASHINGTON-WESTMORELAND-GREENE-FAYETTE- HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER- 325 PM EDT MON AUG 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST CENTRAL OHIO...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. ...SLIGHT RISK FOR SEVERE THUNDERSTORMS... SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS THE REGION THIS EVENING. THERE IS A CHANCE THAT THESE STORMS COULD REACH SEVERE LEVELS. THE MAIN THREAT WILL BE DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 227 PM EDT MON AUG 10 2009 WVZ012-021-022-101930- MARION WV-MONONGALIA WV-WETZEL WV- 227 PM EDT MON AUG 10 2009 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... MARION...WETZEL AND MONONGALIA... AT 223 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BLACKSVILLE TO 7 MILES WEST OF FOLSOM...OR ALONG A LINE EXTENDING FROM BLACKSVILLE TO 4 MILES SOUTH OF JACKSONBURG...MOVING EAST AT 30 MPH. THE STORMS MAY PRODUCE SMALL HAIL...GUSTY WINDS AND BRIEF HEAVY RAINS 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 243 PM EDT MON AUG 10 2009 PAZ032-101945- FAYETTE PA- 243 PM EDT MON AUG 10 2009 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTY... FAYETTE... AT 240 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 4 MILES SOUTH OF MASONTOWN...OR ABOUT OVER GREENSBORO...MOVING EAST AT 32 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... MASONTOWN... HOPWOOD... ELLIOTTSVILLE... CHALKHILL... FARMINGTON... OHIOPYLE... THESE THUNDERSTORMS MAY PRODUCE WIND GUSTS TO 35 MPH...PEA SIZE HAIL AND BRIEF HEAVY RAINS. 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 333 PM EDT MON AUG 10 2009 MDZ001-PAZ032-WVZ021>023-102030- FAYETTE PA-GARRETT MD-MARION WV-MONONGALIA WV-PRESTON WV- 333 PM EDT MON AUG 10 2009 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... GARRETT...FAYETTE...MARION...PRESTON AND MONONGALIA... AT 331 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 2 MILES NORTHEAST OF CLIFTON MILLS TO 3 MILES SOUTHWEST OF BENTONS FERRY... MOVING EAST AT 23 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... WINFIELD... LAUREL RUN... FAIRMONT... DELLSLOW... COLFAX... CLIFTON MILLS... BENTONS FERRY... BRUCETON MILLS... BROWNS CHAPEL... MASONTOWN... VALLEY FALLS... MARKLEYSBURG... THESE STORMS WILL LIKELY PRODUCE WIND GUSTS TO 40 MPH...INTENSE AND FREQUENT LIGHTNING...AND VERY HEAVY RAIN. 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... INTENSE LIGHTNING IS OCCURING 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. $$ A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT MONDAY EVENING FOR EAST CENTRAL OHIO AND NORTHWESTERN PENNSYLVANIA. &&
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 406 PM EDT MON AUG 10 2009 OHZ040-041-PAZ007-008-013-102100- CARROLL OH-COLUMBIANA OH-LAWRENCE PA-MERCER PA-VENANGO PA- 406 PM EDT MON AUG 10 2009 ...THUNDERSTORMS... STRONG THUNDERSTORMS WILL MOVE THROUGH THE FOLLOWING COUNTIES...COLUMBIANA...CARROLL...VENANGO...MERCER AND LAWRENCE... AT 359 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 23 MILES NORTH OF MAURICE K GODDARD STATE PARK TO 35 MILES WEST OF HOMEWORTH...OR ALONG A LINE EXTENDING FROM 23 MILES NORTH OF MAURICE K GODDARD STATE PARK TO 15 MILES NORTHWEST OF STRASBURG...MOVING EAST AT 26 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... SHARON...SALEM...HERMITAGE... THESE STORMS WILL LIKELY PRODUCE STRONG WIND GUSTS TO 50 MPH...INTENSE AND FREQUEST LIGHTNING...AND VERY HEAVY RAIN. SOME OF THESE STORMS COULD BECOME SEVERE AND WARNINGS MAY NEED TO BE ISSUED AS THEY GET CLOSER. KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS APPROACH. PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772. PRECAUTIONARY/PREPAREDNESS ACTIONS... INTENSE LIGHTNING CAN BE EXPECTED WITH THESE STORMS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. $$ A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT MONDAY EVENING FOR EAST CENTRAL OHIO AND NORTHWESTERN PENNSYLVANIA. &&
The Pittsburgh radar (KPBZ), 95 km away, was scanning. The volume nearest the first event began at 21:02 UTC.
1 thunderstorm wind. Local standard time, as filed.
Law enforcement reported power lines down in Uhrichsville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2009Every state in 2009This day in weather historyWarnings in Ohio, August 2009
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: 191658.