A large cluster of showers and severe thunderstorms entered the western boarder of Ohio during the late morning hours of July 11th. As the cluster raced east across the state, the thunderstorms organized into a squall line.
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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.
A large cluster of showers and severe thunderstorms entered the western boarder of Ohio during the late morning hours of July 11th. As the cluster raced east across the state, the thunderstorms organized into a squall line. Reports of wind damage and gusts up to 65mph came in from all over the area during this event. The activity finally began to subside later that afternoon.
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 Jul 11, 10:27 AM EST, 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CLEVELAND OH 1127 AM EDT MON JUL 11 2011 .SYNOPSIS... A COLD FRONT OVER THE WESTERN GREAT LAKES WILL DROP SOUTH ACROSS THE AREA ON TUESDAY. COOLER AND DRIER CANADIAN HIGH PRESSURE WILL BUILD SOUTHEAST ACROSS THE EASTERN GREAT LAKES. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... THE SEVERE THUNDERSTORM WATCH IS IN EFFECT THROUGH LATE AFTERNOON. NOT SURE WE NEED IT ALL THE WAY TO EXTREME NORTHEAST OHIO BUT WE WANTED TO BE CAUTIOUS UNTIL WE ARE SURE WHAT THE LAKE MICHIGAN DERECHO IS GOING TO DO. THERE IS A CHANCE THAT THE SMALL CLUSTER OF STORMS ENTERING NORTHWEST OHIO COULD ALSO TURN INTO A THUNDERSTORM COMPLEX AND MOVE SOUTHEAST TOWARD BOWLING GREEN AND MANSFIELD EARLY THIS AFTERNOON. ALSO NOT SURE WHAT WILL HAPPEN WHEN THE DERECHO CATCHES UP TO THE FIRST CLUSTER OF STORMS. THE CAP WILL BE BROKEN AS THE BOUNDARY LAYER BECOMES MORE UNSTABLE AND MID LEVEL COOLING OCCURS. THE STORMS WILL EVENTUALLY HAVE RAPID PROPAGATION OFF TO THE SOUTHEAST WITH DAMAGING WINDS LIKELY. TEMPERATURES WILL BE DEPENDENT ON THE AMOUNT OF CLOUDS/STORMS ACROSS NOW OHIO. HAVE TRIMMED BACK HIGHS ACROSS NORTHWEST OHIO TO AROUND 90. WILL STICK WITH 90 AND LOWER 90S MOST ELSEWHERE. && .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/... COLD FRONT IS PROGGED TO MOVE THROUGH THE AREA TONIGHT. WELL THAT IS IF YOU WANT TO CALL IT A COLD FRONT. THICKNESS PATTERN DOES NOT EVEN RELAX AT ALL BEHIND THE FRONT. WEAK UPPER LEVEL RIDGE TRIES TO BUILD EAST INTO THE AREA TUESDAY MORNING BUT THEN FLATTENS OUT. THIS MEANS TEMPERATURES ON TUESDAY WILL STILL BE WARM BUT NOT AS WARM AS TODAY. LOOKING UPPER 80S MOST AREAS AND AROUND 90 IN THE WEST. THREAT FOR SHOWERS AND THUNDERSTORMS WILL CONTINUE TONIGHT WITH THE WEAK FRONTAL BOUNDARY AND THEN SHIFT EAST OF THE AREA BY TUESDAY MORNING. HIGH PRESSURE BUILDS SOUTHEAST INTO THE REGION AND BECOMES A DOMINANT WEATHER FEATURE THROUGH THURSDAY NIGHT. HOWEVER...A QUICK SHOT OF UPPER LEVEL POSITIVE VORTICITY ADVECTION TAKES PLACE TUESDAY EVENING INTO TUESDAY NIGHT WITH ASSOCIATED MOISTURE. THIS ACTIVITY COULD PRODUCE A FEW SHOWERS AND THUNDERSTORMS MAINLY ACROSS THE SOUTHERN PORTIONS OF THE FORECAST AREA. ALL OF THE ACTIVITY WILL BE SOUTH OF THE REGION BY WEDNESDAY WITH FAIR WEATHER RESUMING INTO THURSDAY NIGHT. COOLER TEMPERATURES ARRIVE ON WEDNESDAY AS HIGH PRESSURE BUILDS CLOSER TO THE REGION FROM THE NORTHWEST. THIS SHOULD BRING IN A BIT MORE COOL AIR ADVECTION TO THE AREA. STILL LOOKING AT HIGHS IN THE MIDDLE 80S IN THE WEST AND AROUND 80 EAST AND UPPER 70S ALONG THE LAKE SHORE. A BIT OF A WARMUP TAKES PLACE BY ABOUT 2 OR 3 DEGREES BY THURSDAY AS SUBSIDENCE OCCURS UNDER HIGH PRESSURE OVER THE AREA. && .LONG TERM /FRIDAY THROUGH SUNDAY/... THE LONG TERM IS NOT REAL CLEAR. THERE WILL BE A LOW THREAT OF SHOWERS AND THUNDERSTORMS FOR THE PERIOD BUT DETAILS ARE UNCERTAIN. HIGH PRESSURE WILL BE TO THE NORTH WITH AN INVERTED TROF ACROSS THE EASTERN OHIO AND NORTHWEST PA FRIDAY BUT WEAKENING BY SUNDAY ACCORDING TO THE GFS...THE 00Z ECMWF IS MORE PESSIMISTIC. AT THIS TIME DID NOT MAKE MAJOR CHANGES SINCE CONFIDENCE IS NOT REAL HIGH. USED A BLEND OF HPC AND 00Z MOS GUIDANCE FOR THE TEMPERATURES. && .AVIATION /16Z MONDAY THROUGH FRIDAY/... THE QUESTION FOR TODAY IS THE TIMING OF WHEN THE THUNDERSTORMS WILL DEVELOP. STARTING TO GET SOME DEVELOPMENT OVER NORTHERN INDIANA. THE CAUSE OF THE THUNDER WILL BE A PREFRONTAL TROF AND THEN THE COLD FRONT. STILL THINKING THAT THE CURRENT THUNDERSTORM ACTIVITY WILL DECREASE AND THEN REFIRE. CONFIDENCE IN THIS IS LOW. NONE THE LESS THE AIRMASS SHOULD HEAT UP QUICKLY...IT MAY TAKE SOME TIME FOR DEBRIS CLOUDINESS TO GET INTO THE AREA. THE OTHER CONCERN IS WILL WE BE CAPPED WITH 700 MB TEMPERATURES EXPECTED TO BE AROUND 12C. THE MAIN THUNDERSTORM ACTIVITY SHOULD BE LATE THIS AFTERNOON AND EVENING. AFTER THE THUNDERSTORMS SOME FOG IS EXPECTED WITH A VERY MOIST ATMOSPHERE. SOME OF THE MODELS ARE FORECASTING STRATUS TO DEVELOP...AT THIS TIME NOT CONFIDENT IN THAT...THIS WILL HAVE TO BE MONITORED. ANY FOG EARLY THIS MORNING WILL BURN OFF...SOME HAZE COULD BE AROUND WITH THE AIRMASS BECOMING INCREASINGLY MORE HUMID. OUTLOOK...MVFR BR TUESDAY MORNING...OTHERWISE MAINLY VFR THROUGH FRIDAY. && .MARINE... A COLD FRONT WILL CROSS LAKE ERIE TONIGHT AND THEN HIGH PRESSURE WILL BE JUST NORTH OF THE LAKE FOR MUCH OF THE REST OF THE WORK WEEK. THE THREAT FOR A SMALL CRAFT ADVISORY WILL BE LOW WITH THE MAIN THREAT TIMES LATE TONIGHT AND TUESDAY MORNING AFTER THE COLD FRONTAL PASSAGE AND AGAIN TUESDAY THROUGH FRIDAY WITH A NORTH AND NORTHEAST FLOW. AT THIS TIME IT LOOKS LIKE THE WIND SPEEDS SHOULD BE MAINLY 10 TO 15 KNOTS WITH 2 TO 4 FOOT WAVES AT THE MOST...BUT THIS WILL HAVE TO BE MONITORED. SPECIAL MARINE WARNINGS MAY BE NEEDED LATER THIS AFTERNOON AND TONIGHT AS THUNDERSTORMS CROSS THE LAKE. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...NONE. PA...NONE. MARINE...NONE. && SYNOPSIS...KOSARIK NEAR TERM...KOSARIK SHORT TERM...LOMBARDY LONG TERM...KIELTYKA AVIATION...KIELTYKA MARINE...KIELTYKA
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CLEVELAND OH 1037 AM EDT MON JUL 11 2011 LEZ142>146-162>166-OHZ003-006>014-017>023-027>033-036>038-047-089- 121445- 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- 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-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- 1037 AM EDT MON JUL 11 2011 ...SEVERE THUNDERSTORM WATCH 627 IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE...NORTH CENTRAL OHIO...NORTHEAST OHIO AND NORTHWEST OHIO. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. THERE IS A GOOD CHANCE FOR SEVERE THUNDERSTORMS TODAY AND TONIGHT. DAMAGING WINDS ARE THE MAIN THREAT. TORRENTIAL DOWNPOURS WILL OCCUR WITH SOME OF THE STORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. LEZ061-147>149-167>169-PAZ001>003-121445- LAKE ERIE OPEN WATERS FROM RIPLEY TO BUFFALO NY-WILLOWICK TO GENEVA- ON-THE LAKE OH-GENEVA-ON-THE-LAKE TO CONNEAUT OH- CONNEAUT OH TO RIPLEY NY- 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-NORTHERN ERIE- SOUTHERN ERIE-CRAWFORD PA- 1037 AM EDT MON JUL 11 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE AND NORTHWEST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. THERE IS A CHANCE FOR SEVERE THUNDERSTORMS TODAY AND TONIGHT. DAMAGING WIND ARE THE MAIN THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED.
The Northern Indiana radar (KIWX), 163 km away, was scanning. The volume nearest the first event began at 15:47 UTC.
16 thunderstorm wind. Local standard time, as filed.
A cluster of thunderstorms produced estimated wind gusts of 60mph to 65mph. Numerous trees and large tree branches were downed in the area. Power outages resulted from downed powerlines.
Thunderstorm winds downed several large tree limbs.
A complex of thunderstorms tracked across the county producing widespread wind damage. Several reports of downed large trees and branches came in to the office. Crop damage was also reported during this event.
Thunderstorms produced a measured wind gust of 63mph. Other reports of downed large tree branches came in at this time.
Thunderstorm winds downed two large trees.
A large complex of thunderstorms hit the county with estimated wind gusts of 50mph. Structural damage was reported in Mansfield. The nature of the structural damage was not specified in the public report. Large tree branches were downed in the Mansfield area.
Thunderstorm winds downed several large trees.
Thunderstorm winds downed large tree branches and trees across the area.
Thunderstorm winds downed large trees across the area.
Thunderstorm winds downed large trees across the area.
Thunderstorm winds downed several large trees.
Thunderstorms produced an estimated wind gust of 59mph.
A line of thunderstorms raced across the county, producing 60mph wind gusts. Multiple reports of downed large trees and tree branches came in during this event. Power outages were reported as a result of the downed trees on power lines.
Thunderstorm winds downed numerous large trees in the area. Numerous homes in the area were damaged as a result of the downed trees.
A line of thunderstorms produced a 64mph wind gust as they came onshore.
As a line of thunderstorms tracked across the county, winds downed several large trees and tree limbs in the area.
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, 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: 324249, 324678, 324677, 324670, 324679, 324671, 324706, 324716, 324710, 324711, 324676, 324707, 324685, 324704, 324701, 324718.