The cold front that affected northern Ohio on 21 July became stationary and lifted north. A large area of convective thunderstorms passed through the lower Great Lakes during the evening hours.
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 CLE wrote it up.
The cold front that affected northern Ohio on 21 July became stationary and lifted north. A large area of convective thunderstorms passed through the lower Great Lakes during the evening hours.
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 22, 2:31 PM EST, 2 hours 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CLEVELAND OH 331 PM EDT THU JUL 22 2010 .SYNOPSIS... A WARM FRONT WILL LIFT NORTH OF THE AREA TONIGHT AND EARLY FRIDAY. THIS WILL INCREASE THE SOUTHWEST FLOW AND VERY WARM AND HUMID AIR WILL MOVE ACROSS THE AREA. A COLD FRONT WILL SAG SOUTH ACROSS THE LOWER GREAT LAKES SATURDAY NIGHT AND THE OHIO VALLEY SUNDAY MORNING BRING MORE SEASONABLE TEMPERATURES BACK TO THE AREA. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... WARM ADVECTION SHOWERS/STORMS ACROSS INDIANA WILL LIKELY REDEVELOP ACROSS NORTHWEST AND NORTH CENTRAL OHIO THIS EVENING AS THE WARM FRONT LIFTS NORTHEAST. THE MAJORITY OF THE STORMS SHOULD WEAKEN AND/OR DISSIPATE OVERNIGHT BUT CANNOT RULE OUT A COUPLE OF SHOWERS/STORMS SURVIVING ON THE WARM FRONT. HEIGHTS ARE PROGGED TO RISE CONSIDERABLY TONIGHT WHICH SHOULD KEEP THE MAIN COMPLEX OF THUNDERSTORMS MAINLY NORTH OF THE AREA...THE EXCEPTION WOULD BE EXTREME NORTHEAST OHIO/NORTHWEST PENNSYLVANIA WHERE THE SHOWERS/STORMS WILL ARRIVE LATE TONIGHT...PROBABLY BEFORE DAYBREAK. GFS/MAV POP GUIDANCE SEEMS A LITTLE HIGH AT ANY ONE LOCATION AND FORECAST WILL BE CLOSER TO NAM/MET POP GUIDANCE. WARM SOUTH WIND WILL INCREASE TONIGHT ESPECIALLY ON THE HILL TOPS AND NEAR THE LAKESHORE. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY NIGHT/... WARM FRONT WILL LIFT NORTH OF THE AREA ON FRIDAY. THE COMPLICATING FACTOR IS THAT THE EARLY MORNING ACTIVITY WILL LIKELY LAY DOWN SOME OUTFLOW BOUNDARIES ON WHICH NEW SHOWERS/STORMS CAN REDEVELOP. I WOULD THINK THIS WOULD PRIMARILY BE AN ISSUE NEAR/OVER LAKE ERIE AND EXTREME NE OH/NW PA AND WILL HAVE THE HIGHEST POP IN THESE AREAS DECREASING TO JUST A SLIGHT CHANCE SOUTH OF THE TURNPIKE. AT SOME POINT THE ATMOSPHERE SHOULD BECOME CAPPED OVER MOST OF THE AREA. I WOULD THINK THE ACTIVITY SHOULD BE AT A MINIMUM FRIDAY NIGHT INTO SATURDAY ALTHOUGH WE SHOULD KEEP A LOW POP CHANCE NEAR LAKE ERIE WITH HIGHER POP ACROSS LAKE ERIE. SOUTHWEST FLOW WILL BE IMPRESSIVE ON FRIDAY AND TEMPERATURES WILL MAX OUT IN THE LOWER AND MID 90S. THE CLOUDS AND POTENTIAL SHOWER/STORMS WILL SUPPRESS THE HEAT ACROSS EXTREME NE OH/NW PA UNTIL SATURDAY. MODELS HAVING CONVECTIVE FEEDBACK PROBLEMS OVER THE WEEKEND...ALL DEVELOPING A SURFACE LOW THAT IS PROBABLY TOO STRONG CROSSING THE GREAT LAKES. GFS CONTINUES TO BE FASTER WITH THE NEXT COLD FRONT ON SATURDAY NIGHT AND SEEMS MORE IN LINE WITH THE MAJORITY OF THE MODELS. NOT SURE ABOUT THE EXTENT OF THUNDERSTORMS. THE UPPER JET IS NOT IN THE BEST CONFIGURATION FOR WIDESPREAD STORMS AND THE ATMOSPHERE MAY REMAIN CAPPED FOR MUCH OF SATURDAY...BUT WITH THE HEAT AND HUMIDITY THERE WILL PROBABLY BE AT LEAST A BROKEN LINE OF SHOWER/STORMS AHEAD OF THE FRONT LATER SATURDAY/SATURDAY NIGHT. WITH THE FRONT SOUTH OF THE AREA ON SUNDAY...DEWPOINTS SHOULD DROP OFF NOTICEABLY...ESPECIALLY DURING THE DAYTIME MIXING AND TEMPERATURES WILL BE CLOSER TO NORMAL. && .LONG TERM /MONDAY THROUGH THURSDAY/... REGION ON SOUTHERN EDGE OF THE WESTERLIES FOR THE SECOND HALF OF THE WEEK AS THE UPPER RIDGE RETROGRADES WESTWARD TO THE CENTRAL PLAINS BY THURSDAY. SURFACE HIGH PRESSURE IS AGREED UPON FOR TUESDAY. BETTER MOISTURE REMAINS SOUTH...BUT THE NEXT SYSTEM TO WORK THROUGH THE GREAT LAKES WILL BRING A WARM FRONT WEDNESDAY FOLLOWED BY A COLD FRONT THURSDAY. ENSEMBLES AND HPC IN CLOSE AGREEMENT TOO. TEMPERATURES WILL AVERAGE SLIGHTLY ABOVE NORMAL. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... CONVECTION OFF TO THE WEST BUT LOCAL AREA REMAINS LARGELY CAPPED AND STABLE. THERE IS A SLIGHT CHANCE THAT A STORM MAY MAKE IT TO TOL/FDY THIS EVENING AND HAVE LEFT THE CB MENTION. OTHERWISE STATIONARY FRONT ACROSS THE AREA WILL LIFT NORTH TOWARD MORNING. ANY NEW TS COMPLEX DEVELOPMENT TO MOST LIKELY TRACK NORTH OF MOST SITES ACROSS LAKE ERIE AND POTENTIALLY AFFECTING ERI TOWARD MORNING. HAVE KEPT THE OVERNIGHT CB MENTIONS ACROSS THE NORTH. MVFR HZ TOWARD MORNING. BREEZY SOUTHWEST WINDS FRIDAY. THUNDERSTORM CHANCES MIGHT BE LOW AGAIN FRIDAY WITH THE POTENTIAL FOR BEING CAPPED. .OUTLOOK...NON-VFR CONDITIONS IN SCATTERED SHRA/TSRA FRIDAY THROUGH SATURDAY NIGHT AND BRIEFLY WITH EARLY MORNING FOG/HAZE. && .MARINE... WINDS WILL BE GRADUALLY INCREASING OVER THE LAKE TONIGHT AS WARM FRONT LIFTS NORTHEAST ACROSS THE REGION. THE LAKE SHOULD SEE BORDERLINE SMALL CRAFT ADVISORY CONDITIONS ABOUT 4 TO 5 MILES OUT FROM THE SHORELINE ON FRIDAY AS STRONG WARM AIR ADVECTION TAKES PLACE. THE LAKE SHOULD REMAIN IN THE WARM SECTOR AND I ANTICIPATE GRADIENT WILL WEAKEN A BIT FRIDAY NIGHT INTO SATURDAY. HOWEVER...GRADIENT INCREASES AGAIN WITH THE APPROACHING COLD FRONT. COLD FRONT IS EXPECTED TO MOVE THROUGH THE LAKE SATURDAY NIGHT CAUSING WINDS TO INCREASE AS WELL. WAVES EXPECTED TO REACH SMALL CRAFT ADVISORY CRITERIA SATURDAY NIGHT INTO SUNDAY MORNING. WINDS DIMINISH TO LIGHT AND VARIABLE INTO EARLY NEXT WEEK AS HIGH PRESSURE BUILDS EAST ACROSS THE REGION. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...NONE. PA...NONE. MARINE...NONE. && SYNOPSIS...KOSARIK NEAR TERM...KOSARIK SHORT TERM...KOSARIK LONG TERM...OUDEMAN AVIATION...OUDEMAN MARINE...LOMBARDY
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CLEVELAND OH 508 AM EDT THU JUL 22 2010 LEZ061-142>149-162>169-OHZ003-006>014-017>023-027>033-036>038-047- 089-PAZ001>003-230915- 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- 508 AM EDT THU JUL 22 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 TODAY OR TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. STRONG TO SEVERE THUNDERSTORMS MAY OCCUR AT TIMES FRIDAY THROUGH SATURDAY NIGHT...IN ADVANCE OF A COLD FRONT THAT WILL LIKELY MOVE ACROSS THE AREA SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED.
The Detroit radar (KDTX), 124 km away, was scanning. The volume nearest the first event began at 22:13 UTC.
4 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds downed three large trees.
Thunderstorm winds downed two large trees and power poles.
Thunderstorm winds uprooted a tree that was forty feet tall and eight feet in diameter.
Thunderstorm winds uprooted several four inch diameter trees.
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, July 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: 240184, 240189, 240252, 240192.