A very warm and moist air mass for early September helped scattered thunderstorms to develop in the afternoon and evening. Isolated flooding and wind damage were reported.
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 very warm and moist air mass for early September helped scattered thunderstorms to develop in the afternoon and evening. Isolated flooding and wind damage were reported.
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 11, 4:43 PM EST, 1 hour 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 543 PM EDT WED SEP 11 2013 .SYNOPSIS... A STRONG COLD FRONT CROSSES THURSDAY WITH DRASTICALLY COLDER AIR IN ITS WAKE. TEMPERATURES WILL BE NEARLY 10 TO 15 DEGREES BELOW NORMAL FRIDAY AND SATURDAY. A COLD FRONT WITH LITTLE IF ANY PRECIPITATION PASSES SUNDAY NIGHT INTO MONDAY. && .NEAR TERM /THROUGH THURSDAY/... WITH 530PM UPDATE...HAVE UPDATED POP GRIDS FOR OVERALL DIMINISHING TREND IN CONVECTION. HOWEVER...SCATTERED THUNDERSTORMS REMAIN IN THE AREA...AND STILL CANNOT RULE OUT THE POSSIBILITY THAT AN ISOLATED STORM COULD HAVE A SEVERE WIND GUST WITH IT. AS SUCH...WILL NOT DROP ANY COUNTIES FROM THE SEVERE THUNDERSTORM WATCH JUST YET. LOCALIZED HEAVY DOWNPOURS ALSO REMAIN A CONCERN...WITH MULTIPLE COUNTIES HAVING RECEIVED POCKETS OF 1 TO AS MUCH AS 3 INCHES OF RAINFALL. PREVIOUS DISCUSSION FOLLOWS. MUTLI CELL STORMS REMAIN CONFINED TO HIGHER TERRAIN E OF PIT CLOSER TO STRENGTHENING ALBEIT WEAK MID LVL POCKET OF ENERGY THAT EXTENDS INTO CNTRL PA. LATEST HI-RES CONVECTIVE ALLOWING MDLS DO NOT LEND SUPPORT TO A WIDESPREAD SEVERE WEATHER EVENT RATHER PULSE STORMS. AS MENTIONED IN PREVIOUS DISCUSSION/S...AMOUNT OF BUOYANCY IN ATMS ALLOWS STORM TO BECOME TALL QUICKLY...BUT WITH LACK OF SHEAR DO NOT EXPECT MUCH ORGANIZATION AND A LONG LIFE CYCLE GIVEN UPDRAFT STRUCTURE. DOWNPOURS AND LOCALIZED FLOODING IS A CONCERN WITH PWATS PUSHING 2.0 INCHES WHICH RESIDES IN THE 99TH PERCENTILE FOR THIS TIME OF YEAR. RAINFALL RATES APPROACHING AN INCH PER HOUR WILL BE THE NORM. THANKFULLY STORMS ARE MOVING AT A DECENT CLIP AND NO TRAINING HAS SETUP. EXPECT ACTIVITY TO DIE SHORTLY AFTER SUNSET AND QUIET WEATHER TO LAST MUCH OF THE OVERNIGHT HOURS UNTIL THE COLD FRONT ARRIVES. VERY LITTLE CHANGES TO THE GRIDDED DATASET THURSDAY SAVE FOR TIGHTENING UP AND INCREASING POPS AS EVERY LOCATION WILL SEE MEASURABLE RAINFALL. FROPA TIMING IS THE FIRST PART OF THE DAY FOR THE NWRN 1/2 OF THE AREA. DUE TO THE AMOUNT OF CLOUDS...LACK OF STRONG H2 DYNAMICS...AND WEAK MID LEVEL LAPSE RATES NOT EXPECTING SEVERE WEATHER. THIS IS EVEN THE CASE OVER NRN WV AND THE LAURELS WHERE THE COLD FRONT WON/T PASS UNTIL AFTERNOON. TEMPERATURES WERE A BLEND OF NAM12BC AND MOSGUIDE BC. && .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/... BAROCLINIC ZONE WILL BE TRUDGING THROUGH THE SERN PART OF THE FCST AREA AT THE START WITH QPF CONFINED TO SWRN PA INTO THE MTNS OF NRN WV AND WRN MD. MID LVL TROF AXIS OF -2 STANDARD DEVIATIONS BELOW NORMAL DROPS SE OVER THE NERN CONUS. THIS WILL YIELD SCT SHOWERS MAINLY DOWN WIND OF LAKE ERIE /ALONG AND E OF I-79/. COLD ADVECTION IN THE COLUMN YIELDS LITTLE TEMP RISE DURING THE DAY FRIDAY. RIDGES WILL LIKELY EXPERIENCE STEADY TEMPS UNDER NRLY FLOW THRU 7KFT. IT WILL BE NOTICEABLY COOLER WITH HIGHS STRUGGLING TO REACH THE LOWER 60S. CLOSER TO LAKE ERIE...THE MERCURY ONLY WILL MAKE IT INTO THE UPR 50S GIVING A FALL LIKE FEEL FRIDAY. H5 S/W TROUGH CONTINUES TO DROP DISTURBANCES DOWN IN NRLY FLOW SO CLOUDS WON/T FADE WITH THE LOSS OF DAYLIGHT BUT WILL WAIT UNTIL THE PREDAWN HOURS SAT AS HEIGHTS BUILD FROM THE W. && .LONG TERM /SATURDAY THROUGH WEDNESDAY/... HIGH PRESSURE AND ANTICYCLONIC FLOW SCOURS OUT ANY LEFT OVER LOW LEVEL MOISTURE SATURDAY MRNG. EXPECT A FAIRLY EXTENSIVE CU FIELD SAT AFTN UNDER THE POCKET OF COLDER AIR ALOFT. THE POSITION OF HIGH PRESSURE COME DAWN SUN MRNG WILL NOT BE IDEAL FOR RADIATIONAL COOLING...BUT IT WILL BE A CHILLY NIGHT. 40S WILL BE COMMON FOR MINIMUM TEMPS WITH UPR 30S ACR DEEPER MTN VALLEYS AND N OF I-80. IF THE ANTICYCLONE LOCATION SLOWS ITS EASTWARD ADVANCEMENT BY SIX HOURS THEN FROST ADVISORIES MAY BE NEEDED FOR PORTIONS OF OUR AREA. RETURN FLOW USHERS IN WARMER WEATHER SUNDAY INTO EARLY NEXT WEEK. THE ONE WEATHER SYSTEM TO SPEAK OF IS A MOISTURE STARVED COLD FRONT CROSSING SUN NGT INTO MON. ELECTED TO CONTINUE NO POPS FOR THIS BOUNDARY AS IT TRAVERSES. && .AVIATION /22Z WEDNESDAY THROUGH MONDAY/... SHOWERS AND THUNDERSTORMS SHOULD BE MAINLY DIURNAL IN NATURE...DISSIPATING AFTER SUNSET. RESTRICTIONS ARE STILL POSSIBLE WITH THE WANING CONVENCTION...AND ARE LIKELY TO BE WORSE IF A SITE IS DIRECTLY IMPACTED BY A THUNDERSTORM...WITH PLENTY OF LOW LEVEL MOISTURE PRESENT FOR DECENT RAIN RATES. WILL CLEAR THINGS OUT FOR A PERIOD EVERYWHERE BEFORE BRINGING BACK IN SOME FOG. THIS WILL BE GREATLY IMPACTED BY THE AMOUNT OF CLOUD COVER THAT IS PRESENT AND WIND SPEEDS BUT CONSIDERING THE HIGH DEWPOINTS...THINK THAT AT LEAST MVFR FOG COULD BE EXPERIENCED EVERYWHERE. THE COLD FRONT MAKES IT/S APPROACH BY THURSDAY MORNING. HAVE ADDED SHRA TO THE TAF SITES AND MAINTAINED RESTRICTIONS UP NORTH WHERE THE FRONT SHOULD ENTER FIRST. THEN TRIED TO TIME THE ONSET OF PRECIP EVERYWHERE. THUNDERSTORMS ARE LIKELY AGAIN...ESPECIALLY AT THE EASTERNMOST SITES THAT HAVE THE LONGEST CHANCE FOR HEATING. BUT SINCE THIS IS AT THE END OF THE TAF PERIOD...LEFT TSRA OUT FOR NOW. .OUTLOOK.../THURSDAY NIGHT THROUGH MONDAY/... RESTRICTIONS MAY CONTINUE WITH THE PASSAGE OF THE COLD FRONT AND WITH NORTHWEST FLOW BEHIND THE SYSTEM FRIDAY. GENERAL VFR IS ANTICIPATED FOR THE WEEKEND INTO MONDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && SYNOPSIS...98 NEAR TERM...98/33 SHORT TERM...98 LONG TERM...98 AVIATION...34/33
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 323 AM EDT WED SEP 11 2013 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021>023-041-120730- 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- 323 AM EDT WED SEP 11 2013 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. SCATTERED SLOW MOVING THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA THIS AFTERNOON. LOCALIZED FLASH FLOODING MAY BE POSSIBLE WITH THESE STORMS...PARTICULARLY IN URBAN AND POORLY DRAINED AREAS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. A STRONG COLD FRONT WILL MOVE THROUGH THE AREA ON THURSDAY. THERE IS A SMALL CHANCE THAT THUNDERSTORMS ALONG THIS FRONT MAY BECOME CAPABLE OF LARGE HAIL OR A FEW DAMAGING WIND GUSTS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
432 PM EDT WED SEP 11 2013
PAZ007-112130-
MERCER PA-
432 PM EDT WED SEP 11 2013
...A THUNDERSTORM WITH HEAVY RAINFALL WILL AFFECT SOUTH CENTRAL
MERCER COUNTY...
AT 429 PM EDT...A THUNDERSTORM WITH HEAVY RAINFALL WAS LOCATED 3
MILES SOUTH OF MERCER...MOVING EAST AT 10 MPH.
HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL SMALL STREAMS.
LOCATIONS IMPACTED INCLUDE...
RURAL MERCER COUNTY AT 450 PM
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 4125 8010 4117 8006 4116 8028 4122 8029SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
457 PM EDT WED SEP 11 2013
MDZ001-112145-
GARRETT MD-
457 PM EDT WED SEP 11 2013
...A THUNDERSTORM WITH HEAVY RAINFALL CONTINUES TO AFFECT
NORTHEASTERN GARRETT COUNTY...
AT 455 PM EDT...A THUNDERSTORM WITH HEAVY RAINFALL WAS LOCATED 3
MILES SOUTHWEST OF FINZEL...MOVING EAST AT 15 MPH. RADAR ESTIMATES
THAT NEARLY 1.75 INCHES OF RAIN HAS FALLEN FROM THIS STORM.
THIS HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL SMALL
STREAMS.
LOCATIONS IMPACTED INCLUDE...
PINEY GROVE... FINZEL...
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 3963 7897 3962 7909 3971 7910 3973 7907
3973 7894 3972 7893
15SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
532 PM EDT WED SEP 11 2013
WVZ041-112215-
TUCKER WV-
532 PM EDT WED SEP 11 2013
...HEAVY RAIN WILL AFFECT EASTERN TUCKER COUNTY...
AT 529 PM EDT...THUNDERSTORMS WITH HEAVY RAINFALL WERE LOCATED 2
MILES NORTHWEST OF CANAAN VALLEY STATE PARK...MOVING NORTHEAST AT 5
MPH.
HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL SMALL STREAMS.
LOCATIONS IMPACTED INCLUDE...
LANEVILLE... ELK...
CANAAN VALLEY STATE PARK... BLACKWATER FALLS...
THOMAS... GATZMER...
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 3897 7951 3901 7966 3919 7950 3919 7948
3918 7947 3919 7940 3922 7934 3922 7931
3920 7929 3909 7935 3907 7929 3902 7931
3896 7934SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
627 PM EDT WED SEP 11 2013
OHZ069-112300-
MONROE OH-
627 PM EDT WED SEP 11 2013
...A THUNDERSTORM WITH HEAVY RAIN WILL CONTINUE TO AFFECT
NORTHEASTERN MONROE COUNTY...
AT 625 PM EDT...A THUNDERSTORM WITH HEAVY RAIN WAS LOCATED 3 MILES
NORTH OF CLARINGTON...MOVING EAST AT 15 MPH. RADAR ESTIMATES THAT
THIS STORM HAS GENERATED FROM 1 TO 1.5 INCHES OF RAIN.
THIS HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL SMALL
STREAMS.
LOCATIONS IMPACTED INCLUDE...
CLARINGTON... CAMERON...
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 3980 8099 3981 8100 3984 8102 3986 8097
3985 8083 3980 8082 3977 8087 3974 8086
3972 8093
15SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
635 PM EDT WED SEP 11 2013
WVZ003-112300-
OHIO WV-
635 PM EDT WED SEP 11 2013
...A STRONG THUNDERSTORM WILL AFFECT OHIO COUNTY...
AT 633 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR BETHLEHEM...
MOVING NORTHEAST AT 10 MPH.
WIND GUSTS OF 40 TO 50 MPH ARE POSSIBLE WITH THIS STORM. HEAVY RAIN
WILL POND WATER ON ROADS AND QUICKLY FILL SMALL STREAMS.
LOCATIONS IMPACTED INCLUDE...
BETHLEHEM... TRIADELPHIA... VALLEY GROVE...
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 4003 8062 4003 8067 4003 8072 4008 8072
4017 8066 4014 8054 4002 8052 4002 8061
15SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
652 PM EDT WED SEP 11 2013
WVZ004-112315-
MARSHALL WV-
652 PM EDT WED SEP 11 2013
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN MARSHALL COUNTY...
AT 650 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR SHERRARD...
MOVING EAST AT 10 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. HEAVY RAIN WILL
POND WATER ON ROADS AND QUICKLY FILL SMALL STREAMS.
LOCATIONS IMPACTED INCLUDE...
SHERRARD... DALLAS...
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 3994 8075 4003 8072 4002 8055 4001 8052
4000 8052 3993 8056
15The Pittsburgh radar (KPBZ), 67 km away, was scanning. The volume nearest the first event began at 22:55 UTC.
2 thunderstorm wind. Local standard time, as filed.
The Department of Highways reported trees down on East Cove Avenue.
The Department of Highways reported trees down on Castleman Run Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in West Virginia in 2013Every state in 2013This day in weather historyWarnings in West Virginia, September 2013
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: 473322, 473323.