An Isolated Severe Thunderstorm developed ahead of a weak cold front. Wind shear was limited and one pulse severe thunderstorms caused a few trees to come down in Crawford County, Pennsylvania.
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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 CLE wrote it up.
An Isolated Severe Thunderstorm developed ahead of a weak cold front. Wind shear was limited and one pulse severe thunderstorms caused a few trees to come down in Crawford County, 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 Cleveland, OH wrote its last area forecast discussion before the first event at Sep 6, 2:51 PM EST, 54 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CLEVELAND OH 351 PM EDT THU SEP 6 2012 .SYNOPSIS... A WEAK COLD FRONT WILL SAG SOUTHWARD ACROSS THE AREA TONIGHT. A STRONGER COLD FRONT WILL CROSS THE REGION FRIDAY NIGHT. HIGH PRESSURE OVER THE PLAINS SUNDAY WILL MOVE UP THE OHIO VALLEY MONDAY AND TUESDAY. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... LAKE BREEZE/WEAK COLD FRONT HAS BEEN ENOUGH TO GENERATE AN ISOLATED/SCATTERED THUNDERSTORMS. THERE MAY BE ENOUGH DRY AIR THAT FILTERS INTO THE STORMS AT MIDDLE LEVELS THERE COULD BE A STRONGER WIND GUST. SINCE THERE IS MINIMAL UPPER SUPPORT FOR THE STORMS IT APPEARS THEY WILL DISSIPATE SHORTLY AFTER SUNSET. OTHERWISE SKIES WILL GRADUALLY CLEAR. THIS COMBINED WITH SOME DRIER AIR FILTERING INTO THE AREA SHOULD ALLOW LOWS TO DROP INTO THE LOWER 60S AT MANY LOCATIONS. MAYBE A FEW UPPER 50S ACROSS INLAND NW PA. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY NIGHT/... HIGH PRESSURE WILL QUICKLY MOVE EAST OF THE AREA ON FRIDAY AS A STRONGER COLD FRONT MOVES INTO THE CENTRAL GREAT LAKES. AS THE STRONGER TROUGH MOVES OVERHEAD AND THE FRONTAL BOUNDARY MOVES INTO NORTHERN OHIO AND NW PA WE EXPECT A DECENT PERIOD OF SHOWERS. INSTABILITY LOOKS LIMITED SO HAVE ONLY MENTIONED SCATTERED THUNDERSTORMS. STILL SOME LINGERING SHOWERS INTO SUNDAY WITH THE COOLER AIR SPILLING ACROSS LAKE ERIE. HIGH PRESSURE SHOULD TAKE CONTROL OF THE REGION SUNDAY NIGHT. TEMPERATURES WILL REMAIN WARM ON FRIDAY AHEAD OF THE FRONT WITH ONE LAST DAY IN THE 80S. MUCH COOLER FOR SATURDAY AND SUNDAY WITH HIGHS FROM THE MID 60S TO LOWER 70S. && .LONG TERM /MONDAY THROUGH THURSDAY/... COOL HIGH PRESSURE IS EXPECTED OVER THE AREA FOR THE BEGINNING OF THE PERIOD. THE UPPER TROUGH APPEARS TO BE FAR ENOUGH EAST BY MONDAY TO KEEP THE BULK OF ANY AFTERNOON SHOWERS EAST OF THE FORECAST AREA. HIGH PRESSURE WILL KEEP CONDITIONS DRY THROUGH THE REMAINDER OF THE FORECAST PERIOD. AS IT MOVES TO THE EAST COAST THROUGH THE WEEK UPPER LEVEL RIDGING WILL BUILD OVER THE AREA ALLOWING FOR TEMPERATURES TO MODERATE TO NORMAL BY MIDWEEK. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... A WEAK TROUGH OVER NW OH THIS AFTERNOON COMBINED WITH A LAKE BREEZE BOUNDARY WILL BE THE FOCUS FOR CLOUD DEVELOPMENT ALONG WITH THE POSSIBILITY OF SHRA/TS FROM MFD-CAK-YNG LATER THIS AFTERNOON. THINKING ERI-CLE WILL REMAIN DRY WITH THE BOUNDARY SOUTH OF THOSE LOCATIONS. SOME INSTABILITY MOVING INTO NW OH BUT CONCERNED THERE MAY BE LACK OF TRIGGER TO GET WIDESPREAD SHRA/TS GOING. ANY ACTIVITY WILL BE MORE DIURNALLY DRIVEN AND EXPECTING IF ANYTHING DOES DEVELOP IT WILL DIMINISH TOWARD 00Z FRI. GUIDANCE SHOWING POSSIBILITY OF SOME MVFR FOG DEVELOPING LATE TONIGHT. GIVEN CONDITIONS THINKING THIS WILL BE POSSIBLE AGAIN TONIGHT ACROSS SELECTED SITES. MAINLY VFR AFTER 13Z FRI WITH DRY CONDITIONS EXPECTED THROUGH 18Z FRI. KEPT CLE DRY THROUGH 00Z SAT BUT CONFIDENCE MARGINAL GIVEN SOME MODELS BRINGING THE CHC OF SHRA/TS NEAR CLE TOWARD 00Z SAT. .OUTLOOK...PERIODS OF NON VFR LIKELY FRIDAY NIGHT TO SUNDAY. && .MARINE... NOT EXPECTING ANY REAL PROBLEMS ON THE LAKE THROUGH FRIDAY AS LAKE REMAINS RELATIVELY QUIET. A COLD FRONT MOVES ACROSS THE LAKE SATURDAY AND IT APPEARS THE GRADIENT WILL INCREASE AHEAD OF THE FRONT. POSSIBILITY THAT SMALL CRAFT ADVISORIES WILL BE NEEDED FOR LATE FRIDAY NIGHT INTO SATURDAY. AS WEST TO NORTHWEST FLOW DEVELOPS SATURDAY NIGHT...SMALL CRAFT ADVISORIES WILL LIKELY BE NEEDED THROUGH THE REST OF THE WEEKEND INTO MONDAY MORNING. WINDS FINALLY DIMINISH MONDAY AFTERNOON AND GO LIGHT AND VARIABLE THROUGH TUESDAY. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...NONE. PA...NONE. MARINE...NONE. && SYNOPSIS...MULLEN NEAR TERM...MULLEN SHORT TERM...MULLEN LONG TERM...ABE AVIATION...ABE MARINE...LOMBARDY
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CLEVELAND OH 507 AM EDT THU SEP 6 2012 OHZ003-006>014-017>023-027>033-036>038-047-089-PAZ001>003-070915- LUCAS-WOOD-OTTAWA-SANDUSKY-ERIE OH-LORAIN-CUYAHOGA-LAKE-GEAUGA- ASHTABULA INLAND-HANCOCK-SENECA-HURON-MEDINA-SUMMIT-PORTAGE-TRUMBULL- WYANDOT-CRAWFORD-RICHLAND-ASHLAND-WAYNE-STARK-MAHONING-MARION-MORROW- HOLMES-KNOX-ASHTABULA LAKESHORE-NORTHERN ERIE-SOUTHERN ERIE- CRAWFORD PA- 507 AM EDT THU SEP 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL OHIO...NORTHEAST OHIO...NORTHWEST OHIO AND NORTHWEST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE LATER TODAY. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. STRONG THUNDERSTORMS AND LOCALLY HEAVY RAIN ARE EXPECTED LATE FRIDAY AND FRIDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. LEZ061-142>149-162>169-070915- LAKE ERIE OPEN WATERS FROM RIPLEY TO BUFFALO NY- MAUMEE BAY TO RENO BEACH OH-RENO BEACH TO THE ISLANDS OH- THE ISLANDS TO VERMILION OH-VERMILION TO AVON POINT OH- AVON POINT TO WILLOWICK OH-WILLOWICK TO GENEVA-ON-THE LAKE OH-GENEVA- ON-THE-LAKE TO CONNEAUT OH-CONNEAUT OH TO RIPLEY NY- LAKE ERIE OPEN WATERS FROM MAUMEE BAY TO RENO BEACH- LAKE ERIE OPEN WATERS FROM RENO BEACH TO THE ISLANDS- LAKE ERIE OPEN WATERS FROM THE ISLANDS TO VERMILION- LAKE ERIE OPEN WATERS FROM VERMILION TO AVON POINT- LAKE ERIE OPEN WATERS FROM AVON POINT TO WILLOWICK- LAKE ERIE OPEN WATERS FROM WILLOWICK TO GENEVA-ON-THE-LAKE- LAKE ERIE OPEN WATERS FROM GENEVA-ON-THE-LAKE TO CONNEAUT- LAKE ERIE OPEN WATERS FROM CONNEAUT OH TO RIPLEY NY- 507 AM EDT THU SEP 6 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE. .DAY ONE...TODAY AND TONIGHT. ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE LATER TODAY. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. STRONG THUNDERSTORMS ARE EXPECTED LATE FRIDAY AND FRIDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Pittsburgh radar (KPBZ), 119 km away, was scanning. The volume nearest the first event began at 20:46 UTC.
2 thunderstorm wind, 1 hail. Local standard time, as filed.
County dispatch reported a tree down from strong thunderstorm winds.
County dispatch reported a tree down from strong thunderstorm winds.
An amateur radio operator reported penny size hail.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2012Every state in 2012This day in weather historyWarnings in Pennsylvania, September 2012
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: 412951, 412952, 412953.