S provided for southerly flow and moisture transport to eastern Ohio, western Pennsylvania, and northern West Virginia. Showers and thunderstorms with heavy downpours developed in an area out ahead of a cold front allowing for training and rainfall amounts of over 2 inches in some locations.
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.
A slow moving upper level low over the central U.S provided for southerly flow and moisture transport to eastern Ohio, western Pennsylvania, and northern West Virginia. Showers and thunderstorms with heavy downpours developed in an area out ahead of a cold front allowing for training and rainfall amounts of over 2 inches in some locations. Some flooding was reported along creeks, streams, and in low lying areas.
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 Sep 26, 8:56 PM EST, 49 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 956 PM EDT MON SEP 26 2011 .SYNOPSIS... A LARGE UPPER LEVEL SYSTEM WILL SLOWLY MOVE FROM THE MIDWEST THROUGH THE UPPER OHIO VALLEY THIS WEEK. A STRONGER WAVE WILL ROTATE AROUND THE LOW TONIGHT...BRINGING SHOWERS AND SCATTERED STRONG THUNDERSTORMS. ADDITIONAL CHANCES OF SHOWERS AND THUNDERSTORMS WILL PERSIST THROUGH FRIDAY. && .NEAR TERM /THROUGH TUESDAY/... A BAND OF PREFRONTAL SHOWERS AND SCATTERED THUNDERSTORMS IS TRAINING FROM NORTH TO SOUTH IN EXTREME EASTERN OHIO... SOUTHWEST PA AND NORTHERN WEST VIRGINIA. SOME HEAVY DOWNPOURS ARE POSSIBLE WITH THESE STORMS ALONG WITH ISOLATED THUNDERSTORMS. SOME STREAM FLOODING IS POSSIBLE WHERE RAIN PERSISTS FOR SEVERAL HOURS...ESPECIALLY IN AREAS THAT PREVIOUSLY RECEIVED HEAVY RAINFALL THIS EVENING. SHOWERS WITH THE FRONTAL BAND WILL DIMINISH TOWARD DAYBREAK ON TUESDAY. MILD TEMPERATURES WILL PREVAIL TONIGHT...WITH NEAR NORMAL TEMPERATURES TUESDAY. && .SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/... THE UPPER LEVEL LOW WILL CONTINUE TO SPIN TO THE WEST...GRADUALLY MOVING TOWARD THE UPPER OHIO VALLEY BY THURSDAY. WITH THE GREATEST FORCING TO THE WEST CLOSER TO THE CENTER OF THE LOW...AND TO THE EAST ALONG THE FRONTAL BAND...EXPECT PRECIP COVERAGE TO BE SCATTERED FOR THE AREA MIDWEEK. WITH THE COLD DOME GRADUALLY APPROACHING FROM THE WEST...TEMPERATURES WILL MAKE A SLOW FALL...COOLING TO SLIGHTLY BELOW NORMAL BY THURSDAY. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... THE FORECAST PERIOD BEGINS WITH SOME MODEL DIFFERENCES REGARDING THE STRENGTH OF A BROAD MID-LEVEL TROUGH ACROSS THE EASTERN THIRD OF THE US AND THE POSITION OF ITS ATTENDANT CLOSED LOW. THE FORECAST CONSISTS OF A ECMWF/NAEFS BLEND, WITH AN INITIAL WAVE WITH THE TROUGH CROSSING THE UPPER OHIO VALLEY ON FRIDAY WITH THE TROUGH AMPLIFYING AS IT CROSSES THE AREA OVER THE WEEKEND. WITH THIS IN MIND, CHANCE POPS ARE FORECAST FRIDAY AND EARLY SATURDAY, WITH A DRY FORECAST FOR SATURDAY NIGHT INTO MONDAY AS HIGH PRESSURE BUILDS IN FROM THE NORTHWEST. DESPITE MODEL DIFFERENCES IN LARGE SCALE FEATURES, THERE IS SOME AGREEMENT THAT THE AREA WILL BE IN COLD AIR ADVECTION ON FRIDAY AND SATURDAY. THIS WILL ALLOW FOR A MORE FALL-LIKE AIR MASS TO BUILD INTO THE AREA. TEMPERATURES WILL BE 5 TO 10 DEGREES BELOW NORMAL SEASONAL VALUES THROUGHOUT THE EXTENDED FORECAST PERIOD. && .AVIATION /02Z TUESDAY THROUGH SATURDAY/... SHOWERS ALONG AND AHEAD OF A COLD FRONT WILL PUSH EASTWARD ACROSS THE TERMINALS THIS EVENING. A FEW EMBEDDED THUNDERSTORMS ARE POSSIBLE THIS EVENING WITH CB GROUPS WITH -SHRA MENTIONED. A FEW OF THE STORMS MAY HAVE GUSTY WINDS. PREVAILING WINDS WILL BE SOUTHWESTERLY AT AROUND 10KTS WITH GUSTS TO 20KTS AT TIMES AHEAD OF THE FRONTAL PRECIP. SHOWERS WILL CONTINUE TO PREVAIL OVERNIGHT, WITH MVFR CEILINGS AND VISIBILITIES. SHOWERS WILL MOSTLY DIMINISH AS THEY PUSH EAST OF THE TERMINALS TUESDAY MORNING. IN THE WAKE OF SHOWERS, WINDS WILL SHIFT TO SOUTHWESTERLY AT 5 TO 10KTS. A FEW HOURS OF IFR CEILINGS AND VISIBILITIES WILL BE POSSIBLE AT KFKL/KDUJ DURING THE PRE-DAWN HOURS. MVFR CEILINGS WILL LINGER TUESDAY MORNING, RETURNING TO VFR BY 18Z ACROSS THE TERMINALS. .OUTLOOK...TUESDAY NIGHT THROUGH SATURDAY... UPPER LEVEL LOW PRESSURE WILL CONTINUE TO WOBBLE OVER THE GREAT LAKES THROUGH THE MIDWEEK AND FINALLY SHIFT EAST OF THE AREA OVER THE WEEKEND. OCCASIONAL RESTRICTIONS WILL BE POSSIBLE IN SHOWERS...AND IN THE OVERNIGHT AND EARLY MORNING HOURS WHERE LOW CLOUDS/FOG WILL BE POSSIBLE. THE CHANCE OF SHOWERS WITH RESTRICTIONS WILL END ON SATURDAY AS HIGH PRESSURE BUILDS IN FROM THE NORTHWEST. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 1000 PM EDT MON SEP 26 2011 MDZ001-OHZ050-059-069-PAZ007>009-013>016-020>023-029-031-073>076- WVZ001>004-012-021>023-041-280200- GARRETT-JEFFERSON OH-BELMONT-MONROE-MERCER-VENANGO-FOREST-LAWRENCE- BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY-ARMSTRONG-INDIANA- WASHINGTON-GREENE-WESTMORELAND-WESTMORELAND RIDGES-FAYETTE- FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA- PRESTON-TUCKER- 1000 PM EDT MON SEP 26 2011 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...TONIGHT. SOME HEAVY DOWNPOURS ARE POSSIBLE OVERNIGHT WITH SOME RAINFALL ACCUMULATIONS OF 1 TO 2 INCHES POSSIBLE. SOME STREAM FLOODING COULD RESULT IF THE SHOWERS PERSIST FOR SEVERAL HOURS OVER THE SAME AREA. SOME URBAN FLOODING COULD OCCUR IF MORE THAN AN INCH OF RAIN FALLS IN AN HOUR ACROSS A HIGHLY URBANIZED AREA. .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. OHZ039>041-048-049-057-058-068-280200- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-MUSKINGUM-GUERNSEY- NOBLE- 1000 PM EDT MON SEP 26 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .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
602 PM EDT MON SEP 26 2011
PAZ031-WVZ004-012-021-022-262215-
GREENE PA-MARION WV-MARSHALL WV-MONONGALIA WV-WETZEL WV-
602 PM EDT MON SEP 26 2011
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN MARION...
NORTHWESTERN MONONGALIA...SOUTHEASTERN MARSHALL...SOUTHWESTERN GREENE
AND WETZEL COUNTIES...
AT 600 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTH OF
JACKSONBURG...MOVING NORTHEAST AT 40 MPH.
WIND GUSTS TO 40 MPH...PEA-SIZED HAIL...AND DANGEROUS LIGHTNING ARE
POSSIBLE WITH THIS STORM.
SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
PINE GROVE... JACKSONBURG... WILEYVILLE...
SMITHFIELD... FOLSOM... BIG RUN...
WADESTOWN... ROUND BOTTOM... METZ...
LITTLETON... KNOB FORK... HUNDRED...
PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 3945 8058 3944 8061 3946 8064 3947 8071
3954 8079 3978 8066 3971 8030 3946 8044
3947 8049 3945 8051 3943 8052 3943 8055SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
612 PM EDT MON SEP 26 2011
OHZ041-050-PAZ013-020-WVZ001-262315-
BEAVER PA-COLUMBIANA OH-HANCOCK WV-JEFFERSON OH-LAWRENCE PA-
612 PM EDT MON SEP 26 2011
...HEAVY RAIN...
THUNDERSTORMS WITH HEAVY RAIN TO MOVE THROUGH THE FOLLOWING
COUNTIES...
COLUMBIANA...JEFFERSON...BEAVER...LAWRENCE AND HANCOCK...
AT 610 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
SHOWED THUNDERSTORMS WITH HEAVY RAIN OVER NEW MANCHESTER...MOVING
NORTH AT 35 MPH.
SOME OF THESE STORMS WILL BE ACCOMPANIED BY DANGEROUS LIGHTNING...
SMALL HAIL AND WIND GUSTS TO 45 MPH. THESE THUNDERSTORMS CAN PRODUCE
HEAVY RAIN THAT MAY CAUSE PONDED WATER ON ROADS AND IN LOW LYING
AREAS. VISIBILITY CAN BE REDUCED.
SOME LOCATIONS THAT WILL BE IMPACTED BY THESE THUNDERSTORMS
INCLUDE...
HAMMONDSVILLE... NEW MANCHESTER...
TOMLINSON RUN STATE PARK...
RACCOON CREEK STATE PARK... WELLSVILLE...
HARSHAVILLE... NEWELL... CHESTER...
EAST LIVERPOOL... SHIPPINGPORT...
BEAVER CREEK STATE PARK... BLACKHAWK...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
PLEASE REPORT HEAVY RAIN AND FLOODING PROBLEMS TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772.
LAT...LON 4108 8015 4050 8039 4053 8081 4090 8074
4091 8053 4110 8052SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
616 PM EDT MON SEP 26 2011
PAZ031-WVZ004-012-021-022-262315-
GREENE PA-MARION WV-MARSHALL WV-MONONGALIA WV-WETZEL WV-
616 PM EDT MON SEP 26 2011
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN MARION...
NORTHWESTERN MONONGALIA...SOUTHEASTERN MARSHALL...SOUTHERN GREENE AND
WETZEL COUNTIES...
AT 615 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES SOUTHWEST
OF SMITHFIELD...MOVING EAST AT 15 MPH.
WIND GUSTS TO 40 MPH...PEA-SIZED HAIL...AND DANGEROUS LIGHTNING ARE
POSSIBLE WITH THIS STORM.
SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
WILEYVILLE... PINE GROVE... JACKSONBURG...
CAMERON... BIG RUN... SMITHFIELD...
DENVER HEIGHTS... KNOB FORK... ROCKLICK...
LITTLETON... FOLSOM... RYERSON STATION...
PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 3945 8058 3944 8060 3949 8074 3951 8074
3952 8077 3990 8054 3984 8003 3945 8041
3947 8049 3945 8051 3943 8052 3943 8055SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 728 PM EDT MON SEP 26 2011 PAZ007-008-013>015-020>022-270030- ALLEGHENY PA-ARMSTRONG PA-BEAVER PA-BUTLER PA-CLARION PA-LAWRENCE PA- MERCER PA-VENANGO PA- 728 PM EDT MON SEP 26 2011 ...A STRONG THUNDERSTORM WILL AFFECT BUTLER...EASTERN MERCER... LAWRENCE...NORTH CENTRAL ALLEGHENY...NORTHEASTERN BEAVER... NORTHWESTERN ARMSTRONG...SOUTHERN VENANGO AND WEST CENTRAL CLARION COUNTIES... AT 725 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES SOUTH OF MCCONNELLS MILL...MOVING EAST AT 15 MPH. DANGEROUS LIGHTNING...WIND GUSTS TO 40 MPH...AND PEA-SIZED HAIL ARE POSSIBLE WITH THIS STORM. SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE... NEW CASTLE... MCCONNELLS MILL... HARLANSBURG... FOMBELL... ELLWOOD CITY... DARLINGTON... BEAVER FALLS... ZELIENOPLE... STONEBORO... GROVE CITY... CRANBERRY... MORAINE STATE PARK... PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY. LAT...LON 4149 8003 4121 7940 4058 8012 4085 8052
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Emergency management reported roads covered up to one foot deep from small creeks.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in West Virginia in 2011Every state in 2011This day in weather historyWarnings in West Virginia, September 2011
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: 347781.