A warm lifted into northern Ohio during the afternoon hours of August 11th. Showers and thunderstorms developed along the front.
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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 warm lifted into northern Ohio during the afternoon hours of August 11th. Showers and thunderstorms developed along the front. One of the stronger thunderstorms 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 Cleveland, OH wrote its last area forecast discussion before the first event at Aug 11, 1:00 PM EST, 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CLEVELAND OH 200 PM EDT WED AUG 11 2010 .SYNOPSIS... A WEAK FRONTAL BOUNDARY WILL WOBBLE ACROSS WESTERN AND CENTRAL OHIO THROUGH TONIGHT. LOW PRESSURE WILL MOVE ACROSS ONTARIO ON THURSDAY DRAGGING A WEAKENING COLD FRONT ACROSS THE REGION. THE NEXT STORM SYSTEM WILL BE MOVING INTO THE WESTERN GREAT LAKES ON SATURDAY THEN SWEEP ACROSS THE AREA LATE SUNDAY INTO MONDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... A WEAK FRONTAL BOUNDARY LOCATED ACROSS WESTERN AND CENTRAL OHIO HAVE BEEN THE FOCUS FOR A FEW SHOWERS THROUGH THE NIGHT. A FEW OF THESE SHOWERS MAY CLIP THE REGION THIS MORNING. THIS BOUNDARY WILL REMAIN CLOSE ENOUGH TO THE SOUTHWESTERN COUNTY WARNING AREA TO WARRANT A MENTION OF THUNDERSTORMS FOR THE AFTERNOON. ADDITIONAL THUNDERSTORMS WILL DEVELOP OVER NORTHERN INDIANA AND COULD SLIDE INTO NW OHIO DURING THE LATE AFTERNOON. THERE IS PLENTY OF LOW LEVEL MOISTURE AROUND AGAIN THIS MORNING WITH AREAS OF FOG. THE THICKEST FOG IS LOCATED ACROSS NE OHIO INTO NW PA WHERE SKIES HAVE BEEN CLEAR FOR MOST OF THE NIGHT. IT APPEARS THAT VISIBILITIES WILL FLUCTUATE ENOUGH ACROSS THIS REGION TO KEEP US FROM ISSUING A DENSE FOG ADVISORY. HOWEVER WILL KEEP A SHORT TERM FORECAST GOING MENTIONING THE THICKER FOG THROUGH AT LEAST SUNRISE. PLENTY OF MIDDLE AND HIGH LEVEL CLOUD COVER WILL DRIFT ACROSS THE REGION TODAY WHICH WILL LEAD TO A GENERALLY PARTLY SUNNY SKY. THIS SHOULD HAVE AN IMPACT ON HIGH TEMPERATURES BUT STILL SOME UNCERTAINTY ON HOW MUCH UNDER GUIDANCE TO GO. MAV GUIDANCE HAS BEEN A COUPLE DEGREES TOO WARM OVER THE LAST SEVERAL DAYS SO WILL UNDERCUT IT AT LEAST SLIGHTLY. && .SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY NIGHT/... THE WEAK FRONTAL BOUNDARY AND OUTFLOW FROM CONVECTION OVER INDIANA SHOULD DRIFT INTO NORTHWESTERN OHIO THROUGH THE EVENING. BELIEVE MOST OF THIS ACTIVITY WILL BE SCATTERED IN NATURE. THE SCATTERED ACTIVITY WILL CONTINUE INTO THURSDAY AS A WEAKENING COLD FRONT SLIDES INTO THE REGION. THE NEXT STORM SYSTEM WILL MOVE INTO THE WESTERN GREAT LAKES ON FRIDAY WITH AT LEAST A LULL IN THE SHOWER AND THUNDERSTORM ACTIVITY ANTICIPATED ACROSS NORTHERN OHIO AND NW PA. AS A COLD FRONT APPROACHES ON SATURDAY THERE SHOULD BE A GRADUAL INCREASE IN THUNDERSTORM CHANCES THROUGH THE AFTERNOON INTO THE EVENING. THESE SHOWER AND THUNDERSTORM CHANCES WILL CONTINUE INTO SATURDAY NIGHT AS WE AWAIT THE COLD FRONTAL PASSAGE. TEMPERATURES FOR THE END OF THE WEEK INTO THE WEEKEND WILL CONTINUE TO BE ABOVE AVERAGE WITH HIGHS REMAINING IN THE MID 80S TO NEAR 90. THE AMOUNT OF CLOUD COVER EACH AFTERNOON WILL DICTATE IF WE CAN TOUCH 90 DEGREES OR NOT. && .LONG TERM /SUNDAY THROUGH TUESDAY/... SHOWER AND THUNDERSTORM CHANCES WILL CONTINUE ALONG AND AHEAD OF A SLOW MOVING COLD FRONT THAT SHOULD MOVE ACROSS AT LEAST HALF OF NORTHERN OHIO BY SUNDAY EVENING. THE SLOWER FRONTAL MOVEMENT SHOULD ALLOW FOR ANOTHER DAY WITH HIGHS IN THE 80S. IF ENOUGH BREAKS IN THE CLOUD COVER CAN OCCUR THE REGION MAY SEE A FEW LOCATIONS APPROACH 90 DEGREES. COLD FRONT WILL BEGIN TO PUSH EAST OF THE AREA MONDAY AFTERNOON. THE FRONT SHOULD TAKE THE PRECIPITATION WITH IT AND WILL BE FAR ENOUGH EAST THAT I SHOULD BE ABLE TO KEEP THE DAY TIME PERIOD DRY. UPPER LEVEL TROUGH SWINGS THROUGH THE AREA OVER THE TOP OF THE SURFACE RIDGE. HOWEVER...THIS UPPER LEVEL FEATURE IS EXPECTED TO BE DRY AS IT MOVES INTO THE REGION. SOME CLOUDS WILL SPREAD INTO THE REGION WITH THE TROUGH. DROPPED TEMPERATURES BACK A FEW DEGREES WITH WEST NORTHWEST FLOW EXPECTED IN THE COLD AIR ADVECTION. NIGHT TIME LOWS UP A FEW DEGREES WITH THE CLOUD COVER SUPPORTING LESS RADIATIONAL COOLING. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... ONE ROUND OF THUNDERSTORMS IS TRYING TO WEAKEN AS IT MOVES EAST AND THEN ANOTHER ROUND MAY DEVELOP AHEAD OF ANOTHER SHORT WAVE FOR THE EVENING HOURS. AFTER THAT MOVES THROUGH AND WITH LIGHT WINDS AND A MOIST ATMOSPHERE MVFR AND IFR FOG WILL DEVELOP AFTER 05Z. THE FOG WILL BURN OFF BETWEEN 14Z AND 15Z. BEING THAT IT IS AUGUST IT WILL TAKE A LITTLE LONGER TO BURN OFF THEN IT WOULD HAVE IN JULY. MORE CUMULUS WILL BE DEVELOPING THURSDAY. .OUTLOOK...AREAS OF NON VFR IN SCATTERED SHOWERS AND THUNDERSTORMS THURSDAY AND AGAIN LATE SATURDAY THROUGH SUNDAY. && .MARINE... LAKE IS EXPECTED TO BE RATHER TRANQUIL FOR THE NEXT SEVERAL DAYS. SOUTHERLY FLOW WILL DEVELOP ON SATURDAY AND TAKE WINDS UP TO 10 KNOTS. THIS SHOULD STILL KEEP WAVES FROM EXCEEDING SMALL CRAFT CRITERIA. HOWEVER...GRADIENT BEGINS TO TIGHTEN SATURDAY NIGHT INTO SUNDAY AND WINDS WILL LIKELY BE APPROACHING 20 KNOTS. SMALL CRAFT FLAGS COULD POSSIBLY BE FLYING BY SUNDAY MORNING. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...NONE. PA...NONE. MARINE...NONE. && SYNOPSIS...MULLEN NEAR TERM...MULLEN SHORT TERM...MULLEN LONG TERM...LOMBARDY/MULLEN AVIATION...KIELTYKA MARINE...LOMBARDY
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CLEVELAND OH 426 AM EDT WED AUG 11 2010 LEZ061-142>149-162>169-OHZ003-006>014-017>023-027>033-036>038-047- 089-PAZ001>003-120830- LAKE ERIE OPEN WATERS FROM RIPLEY TO BUFFALO NY- 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-WILLOWICK TO GENEVA-ON-THE LAKE OH-GENEVA- ON-THE-LAKE TO CONNEAUT OH-CONNEAUT OH TO RIPLEY NY- 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- 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-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-NORTHERN ERIE-SOUTHERN ERIE-CRAWFORD PA- 426 AM EDT WED AUG 11 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE...NORTH CENTRAL OHIO...NORTHEAST OHIO...NORTHWEST OHIO AND NORTHWEST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Cleveland radar (KCLE), 108 km away, was scanning. The volume nearest the first event began at 18:39 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds toppled a utility pole and a large tree.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2010Every state in 2010This day in weather historyWarnings in Ohio, August 2010
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: 254895.