Multi-cluster thunderstorms occurred along the outer edge of a flattening ridge over the central plains states through the time period. With ample surface heating, instability and weak shear some of the thunderstorms produced heavy downpours causing localized 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.
Multi-cluster thunderstorms occurred along the outer edge of a flattening ridge over the central plains states through the time period. With ample surface heating, instability and weak shear some of the thunderstorms produced heavy downpours causing localized 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 Jul 24, 6:42 AM EST, 2 hours 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 742 AM EDT SUN JUL 24 2011 .SYNOPSIS... WARM AND HUMID CONDITIONS WILL PERSIST INTO MONDAY...ALONG WITH SCATTERED THUNDERSTORMS. THE PASSAGE OF A COLD FRONT ON MONDAY WILL BRING COOLER TEMPERATURES AND LOWER HUMIDITY BY TUESDAY. && .NEAR TERM /THROUGH TONIGHT/... SHOWERS AND ISOLATED THUNDERSTORMS ASSOCIATED WITH A DECAYING COMPLEX WILL CROSS AREAS MAINLY SOUTH OF THE MASON DIXON THIS MORNING. WILL USE SCATTERED TO NUMEROUS POPS FOR THIS AREA WITH ISOLATED FURTHER NORTH. FOR THIS AFTN...NUMEROUS RIPPLES IN THE FLOW COMBINED AND OUTFLOW BOUNDARIES WITH LOW LEVEL MOISTURE WILL BRING HARD TO TIME SHOWERS AND STORMS INTO TONIGHT. IT WILL CONTINUE TO BE WARM AND HUMID BUT WITH QUITE A BIT OF DEBRIS CLOUDS AND SCATTERED STORMS EXPECT HIGHS TO BE AT LEAST A COUPLE DEGREES COOLER TODAY SO NO HIGHLIGHT FOR HEAT INDEX. QUITE WARM AND MUGGY TONIGHT. && .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... LOW PRESSURE OVER LOWER MICHIGAN SUNDAY NIGHT WILL MOVE EAST INTO EASTERN ONTARIO BY MONDAY MORNING. THIS WILL BRING A COLD FRONT THROUGH THE REGION MONDAY MORNING...TRIGGERING ANOTHER ROUND OF THUNDERSTORMS. HAVE GONE WITH HIGH CHANCE POPS FOR THE FRONTAL PASSAGE ITSELF...WITH ONLY THE RIDGES POSSIBLY SEEING PRECIPITATION AFTER SUNSET. HIGH PRESSURE BUILDING ACROSS THE OHIO VALLEY WILL TEMPORARILY BRING COOLER AIR INTO THE AREA...WITH HIGH TEMPERATURES ON TUESDAY EXPECTED TO BE AROUND CLIMATOLOGY VALUES IN THE MID 80S. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... DRY CONDITIONS WILL PREVAIL WEDNESDAY AND THURSDAY AS RIDGING IS PROGGED TO BUILD BACK OVER THE REGION. BY THE END OF THE WEEK...MEDIUM RANGE MODELS FLATTEN THE RIDGE...WITH THE NEXT COLD FRONT APPROACHING THE AREA SATURDAY. GIVEN MODEL DIFFERENCES ON RIDGE BREAKDOWN...WILL KEEP PRECIP CHANCES SLIGHT THROUGH FRIDAY...WITH CHANCE POPS ENTERING THE REGION SATURDAY. TEMPERATURES WILL WARM BACK UP MIDWEEK...WITH HIGHS BACK INTO THE LOWER 90S POSSIBLE FOR MANY AREAS THURSDAY/FRIDAY. && .AVIATION /12Z SUNDAY THROUGH THURSDAY/... SHOWERS AND ISOLATED TSTMS WILL PREVAIL THROUGH THIS MORNING WITH THE PASSAGE OF A DECAYING COMPLEX SOUTH OF THE MASON DIXON...MAINLY AFFECTING MGW. FOR THE OTHER PORTS THROUGH MID MORNING...AREAS OF MVFR BR WITH PATCHES OF IFR CIGS WILL PREVAIL. WILL BRING A RETURN OF VFR CONDITIONS FOR ALL PORTS BY 14-15Z... WITH CU DEVELOPING FROM PIT/BVI SOUTH AHEAD OF APPROACHING COOL FRONT. WILL INCLUDE A TEMPO GROUP FOR A RE-FIRE OF SHOWERS/STORMS ALONG BOUNDARY DURING THE LATE AFT/EARLY EVE HOURS. OUTLOOK /MONDAY THROUGH THURSDAY/... EXPECT LATE NIGHT AND EARLY MORNING MVFR HAZE AND IFR FOG ALONG WITH SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS MONDAY. EXPECT PREVALENT VFR TUESDAY THROUGH THURSDAY UNDER HIGH PRESSURE. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 400 AM EDT SUN JUL 24 2011 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021>023-041-250800- 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-GREENE-WESTMORELAND-WESTMORELAND RIDGES- FAYETTE-FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION- MONONGALIA-PRESTON-TUCKER- 400 AM EDT SUN JUL 24 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...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. 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
757 AM EDT SUN JUL 24 2011
WVZ041-241400-
TUCKER WV-
757 AM EDT SUN JUL 24 2011
...SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN TO AFFECT
TUCKER COUNTY...
AT 754 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
SHOWED SHOWERS AND ISOLATED THUNDERSTORMS WITH HEAVY RAIN 3 MILES
WEST OF SAINT GEORGE...MOVING EAST AT 20 MPH. RAINFALL OF OVER ONE
INCH IS POSSIBLE WITH THE STORMS. PONDING OF WATER ON ROADWAYS IS
LIKELY...WITH LOCALIZED FLOODING OF POOR DRAINAGE AREAS POSSIBLE.
SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
HANNAHSVILLE... PLEASANT RUN... SAINT GEORGE...
PARSONS... DAVISVILLE... HAMBLETON...
HENDRICKS... ELK... THOMAS...
BLACKWATER FALLS... CANAAN VALLEY STATE PARK...
GATZMER...
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 3897 7952 3903 7978 3909 7979 3913 7985
3923 7982 3926 7972 3926 7966 3923 7954
3919 7947 3922 7930 3919 7929 3910 7934
3908 7929 3906 7929 3898 7933 3896 7936The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
State official reported of urban-type flooding in Parsons. Small streams and culverts overflowing and effecting vegetation. Some roads closed including Route 219 at the Tucker/Randolph county line. Some homes and local businesses effected.
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, July 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: 335388.