Scattered thunderstorms developed along a stalled frontal boundary and a few of these became severe.
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 thunderstorms developed along a stalled frontal boundary and a few of these became severe.
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 Jun 21, 8:10 PM EST, 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 910 PM EDT TUE JUN 21 2011 .SYNOPSIS... A STALLED WARM FRONT WILL CONTINUE TO BRING WARM AND HUMID CONDITIONS THROUGH WEDNESDAY. THUNDERSTORMS WILL BE SCATTERED TONIGHT...BECOMING MORE NUMEROUS WEDNESDAY AND THURSDAY. A COLD FRONT WILL LOWER DAYTIME TEMPERATURES THURSDAY...BUT MAINTAIN A CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH FRIDAY. && .NEAR TERM /THROUGH WEDNESDAY/... ADJUSTED TEMPS AND SKY COVER...ADJUSTED POP USING THE HRRR TO ACCOUNT FOR SHOWERS AND THUNDERSTORMS MOVING THROUGH OH COUNTIES. SHOWERS AND TSTMS WILL INCREASE IN COVERAGE THIS EVENING FROM THE SOUTHWEST AND WEST...AS A WEAK SHORTWAVE ROTATES ACROSS THE AREA. WITH SIGNIFICANT FORCING TO THE NORTH AND WEST OF THE AREA...WILL KEEP POPS SCATTERED WITH ANY BROKEN LINE THAT FORMS. WITH DEEP LAYER SHEAR MARGINAL...THINK STORMS WILL BE OF THE PULSE TYPE...WITH A COUPLE OF STORMS PERHAPS PRODUCING GUSTY WINDS. LOCALLY HEAVY RAIN IS ALSO POSSIBLE...WITH RECENT FLASH FLOOD GUIDANCE SUGGESTING RAIN AMOUNTS OF MORE THAN 1.5 INCHES IN 3 HOURS TO INITIATE FLOODING PROBLEMS. COVERAGE OF PRECIP WILL DECREASE SOME AFTER MIDNIGHT AS THE IMPULSE EXITS TO THE EAST. HUMID CONDITIONS WILL CONTINUE WITH LOW TEMPERATURES IN THE MID/UPPER 60S. MODELS IN AGREEMENT WITH A STRONGER SHORTWAVE CROSSING THE AREA AS A SURFACE COLD FRONT MAKES ITS APPROACH...AND UPPER LEVEL LOW PRESSURE NUDGES CLOSER TO THE AREA. WILL INCREASE POPS TO LIKELY BY WEDNESDAY AFTN. WITH DEEP LAYER SHEAR PROGGED TO INCREASE...CHANCES OF STRONG/LOCALLY SEVERE TSTMS WILL INCREASE. WARM AND HUMID CONDITIONS WILL CONTINUE. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/... THE COLD FRONT IS FORECAST TO ENTER THE REGION WEDNESDAY NIGHT EXITING THE AREA BY THURSDAY. WILL USE LIKELY POPS WITH THE FRONTAL CROSSING...WITH POPS DIMINISHING POST FRONTAL BY LATE WEDNESDAY NIGHT. UPPER LEVEL LOW PRESSURE LINGERS BEHIND THE SURFACE FRONT FOR THURSDAY/FRIDAY BRINGING CONTINUED CHANCES OD SHOWERS AND THUNDERSTORMS. DAYTIME TEMPERATURES WILL COOL TO SLIGHTLY BELOW NORMAL VALUES...WITH A GRADUAL DECREASE IN HUMIDITY LEVELS. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... SLOW MOVING LOW PRESSURE SYSTEM WILL LIFT NORTHEAST INTO SOUTHERN QUEBEC SATURDAY. THIS SYSTEM WILL PUSH A SURFACE FRONT THROUGH THE REGION EARLY IN THE WEEKEND. SCATTERED SHOWERS CAN BE EXPECTED THROUGH SATURDAY NIGHT. SURFACE HIGH PRESSURE WILL BUILD INTO THE UPPER OHIO REGION SUNDAY AND SHOULD REMAIN OVER THE REGION INTO EARLY NEXT WEEK. MAINLY DRY CONDITIONS ARE FORECAST. WENT CLOSE TO HPC GUIDANCE WITH TEMPERATURES A FEW DEGREES BELOW NORMAL THROUGH MONDAY AND NEAR NORMAL TUESDAY. && .AVIATION /01Z WEDNESDAY THROUGH SUNDAY/... AREA OF SHOWERS AND STORMS MOVING NORTHEAST UP OHIO RIVER VALLEY SHOULD SLOWLY DECREASE AS THE EVENING WEARS ON. ADDED TEMPS FOR MVFR THUNDERSTORMS FROM ZANESVILLE 02-04Z UP TO PIT/AGC AND BVI BY 03-05Z. NOT CONFIDENT STORMS WILL BE ABLE TO HOLD TOGETHER BEYOND THAT POINT AND WERE NOT ADDED TO REMAINDER OF TERMINALS. HAVE MODERATE CONFIDENCE THAT AREAS OF MVFR FOG AND STRATUS WILL FORM AGAIN AFTER 09Z WEDNESDAY...WITH IFR RESTRICTIONS POSSIBLE AT KFKL AND KDUJ. COVERAGE OF SHOWERS AND THUNDERSTORMS IS FORECAST TO INCREASE BY 15Z WEDNESDAY AS A SHORTWAVE TROUGH MOVES ACROSS THE REGION AND PROVIDES EXTRA LIFT. OUTLOOK FOR THURSDAY THROUGH SUNDAY... AREAS OF EARLY MORNING IFR/MVFR FOG FOLLOWED BY SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WITH ADDITIONAL RESTRICTIONS CAN BE EXPECTED THURSDAY THROUGH SATURDAY. HIGH PRESSURE WILL BUILD INTO THE UPPER OHIO VALLEY WITH GENERALLY VFR WEATHER SUNDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 245 PM EDT TUE JUN 21 2011 OHZ039>041-048>050-057>059-068-069-WVZ001>004-012-021-221845- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON OH- MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-HANCOCK-BROOKE-OHIO-MARSHALL- WETZEL-MARION- 245 PM EDT TUE JUN 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT. DAMAGING WIND WILL BE MORE OF A THREAT THAN LARGE HAIL. FLOODING WILL ALSO BE A CONCERN, AS THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY RAINFALL. FLOODING MAY OCCUR IN LOCATIONS THAT GET MORE THAN 1.5 INCHES IN LESS THAN 3 HOURS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WEDNESDAY AND THURSDAY. DAMAGING WIND WILL CONTINUE TO BE MORE OF A THREAT THAN LARGE HAIL. FLOODING WILL CONTINUE TO ALSO BE A CONCERN, AS THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY RAINFALL. FLOODING MAY OCCUR IN LOCATIONS THAT GET MORE THAN 1.5 INCHES IN LESS THAN 3 HOURS, PERHAPS LESS NEEDED IF HIT BY PREVIOUS HEAVY RAIN. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MDZ001-PAZ007>009-013>016-020>023-029-031-073>076-WVZ022-023-041- 221845- GARRETT-MERCER-VENANGO-FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA- BEAVER-ALLEGHENY-ARMSTRONG-INDIANA-WASHINGTON-GREENE-WESTMORELAND- WESTMORELAND RIDGES-FAYETTE-FAYETTE RIDGES-MONONGALIA-PRESTON-TUCKER- 245 PM EDT TUE JUN 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED THUNDERSTORMS HAVE THE POTENTIAL OF PRODUCING LOCALLY HEAVY RAINFALL THIS AFTERNOON AND TONIGHT. FLOODING MAY OCCUR IN LOCATIONS THAT GET MORE THAN 1.5 INCHES IN LESS THAN 3 HOURS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY. DAMAGING WIND WILL BE MORE OF A THREAT THAN LARGE HAIL. FLOODING WILL CONTINUE TO ALSO BE A CONCERN, AS THUNDERSTORMS MAY PRODUCE LOCALLY HEAVY RAINFALL. FLOODING MAY OCCUR IN LOCATIONS THAT GET MORE THAN 1.5 INCHES IN LESS THAN 3 HOURS, PERHAPS LESS NEEDED IF HIT BY PREVIOUS HEAVY RAIN. .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
803 PM EDT TUE JUN 21 2011
OHZ057>059-068-069-WVZ004-012-220100-
BELMONT OH-GUERNSEY OH-MARSHALL WV-MONROE OH-MUSKINGUM OH-NOBLE
OH-WETZEL WV-
803 PM EDT TUE JUN 21 2011
...THUNDERSTORMS...
THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...
MONROE...NOBLE...MUSKINGUM...BELMONT...GUERNSEY...WETZEL AND
MARSHALL...
AT 758 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES
SOUTHEAST OF CANNELVILLE TO 30 MILES SOUTHWEST OF FLY...OR ALONG A
LINE EXTENDING FROM 5 MILES SOUTHEAST OF CANNELVILLE TO 17 MILES
SOUTHEAST OF MARIETTA...MOVING NORTHEAST AT 35 MPH.
SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE...
CANNELVILLE... RURALDALE... PHILO...
BLUE ROCK STATE PARK... DUNCAN FALLS...
HIGH HILL... CHANDLERSVILLE... DUDLEY...
CUMBERLAND... CALDWELL... BELLE VALLEY...
WOLF RUN STATE PARK...
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 REPORTED WITH THIS STORM. 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.
&&
LAT...LON 3982 8211 4011 8148 3971 8071 3959 8084
3957 8090 3960 8094 3955 8102 3957 8108
3957 8126 3960 8127 3958 8135 3963 8146
3958 8148 3957 8156 3959 8159 3965 8159
3967 8165 3975 8165 3976 8204SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
843 PM EDT TUE JUN 21 2011
OHZ039-040-048>050-057>059-068-069-WVZ003-004-220145-
BELMONT OH-CARROLL OH-COSHOCTON OH-GUERNSEY OH-HARRISON OH-JEFFERSON
OH-MARSHALL WV-MONROE OH-MUSKINGUM OH-NOBLE OH-OHIO WV-TUSCARAWAS OH-
843 PM EDT TUE JUN 21 2011
...THUNDERSTORMS...
THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...
MONROE...NOBLE...MUSKINGUM...BELMONT...GUERNSEY...HARRISON...
COSHOCTON...JEFFERSON...TUSCARAWAS...CARROLL...MARSHALL AND OHIO...
AT 837 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED STRONG THUNDERSTORMS WITH SMALL HAIL ALONG A LINE
EXTENDING FROM 4 MILES WEST OF LAYLAND TO 2 MILES SOUTHWEST OF
GRAYSVILLE...MOVING NORTHEAST AT 30 MPH.
SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE...
WARSAW... SUMMERFIELD... SENECAVILLE...
SENECA LAKE PARK... OTSEGO... GRAYSVILLE...
COSHOCTON... CAMBRIDGE... BYESVILLE...
BODEN... BLISSFIELD... LAYLAND...
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 REPORTED WITH THIS STORM. 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.
&&
LAT...LON 4045 8167 4064 8165 4067 8146 4065 8142
4065 8124 4068 8123 4006 8054 3961 8123
4046 8217SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
855 PM EDT TUE JUN 21 2011
PAZ007-220130-
MERCER PA-
855 PM EDT TUE JUN 21 2011
...THUNDERSTORMS...
THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTY...
MERCER...
AT 850 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED STRONG THUNDERSTORMS WITH HALF INCH HAIL 4 MILES SOUTH OF
GREENVILLE...MOVING NORTHEAST AT 20 MPH.
SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE...
GREENVILLE...
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 REPORTED WITH THIS STORM. 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.
&&
LAT...LON 4149 8041 4148 8017 4148 8016 4125 8034
4132 8053 4139 8053 4149 8047 4150 8043SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
904 PM EDT TUE JUN 21 2011
PAZ007-008-014-220145-
BUTLER PA-MERCER PA-VENANGO PA-
904 PM EDT TUE JUN 21 2011
...THUNDERSTORMS...
THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...
BUTLER...VENANGO AND MERCER...
AT 859 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED STRONG THUNDERSTORMS WITH SMALL HAIL 4 MILES NORTH OF
GROVE CITY...MOVING NORTHEAST AT 25 MPH.
SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE...
MERCER... GROVE CITY... STONEBORO...
MAURICE K GODDARD STATE PARK... POLK...
SUGARCREEK... FRANKLIN... COOPERSTOWN...
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 REPORTED WITH THIS STORM. 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.
&&
LAT...LON 4149 7973 4112 8004 4120 8025 4149 8008
4149 8001 4150 8001 4155 7995 4156 7993
4156 7992The Cleveland radar (KCLE), 109 km away, was scanning. The volume nearest the first event began at 01:35 UTC.
2 thunderstorm wind. Local standard time, as filed.
The Department of Highways reported power lines down in Auburn Township on Buehler Road.
A trained spotter reported trees down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2011Every state in 2011This day in weather historyWarnings in Ohio, June 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: 321247, 321241.