A cold front dropped south from the Great Lakes into northern Ohio.
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.
A cold front dropped south from the Great Lakes into northern Ohio.
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 21, 2:49 PM EST, 21 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE CLEVELAND OH 349 PM EDT WED JUL 21 2010 .SYNOPSIS... A WEAK COLD FRONT NEAR LAKE ERIE WILL MOVE SOUTHEAST OF THE AREA EARLY TONIGHT. HIGH PRESSURE FROM THE UPPER MISSISSIPPI VALLEY WILL MOVE ACROSS THE GREAT LAKES TONIGHT AND THURSDAY. THE FRONT WILL MOVE BACK NORTH AS A WARM FRONT ON FRIDAY AND FRIDAY NIGHT. A COLD FRONT IS EXPECTED TO DROP SOUTHEAST ACROSS THE AREA SATURDAY NIGHT. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... WEAK COLD FRONT IS NEAR LAKE ERIE AND WILL SAG SOUTH ACROSS THE AREA EARLY TONIGHT. DRYING OUT ALOFT SO MANY OF THE STORMS WILL NOT GET TOO TALL BUT THEY COULD BRING DOWN WIND AND THERE IS SOME SHEAR. ISOLATED SEVERE STORMS POSSIBLE THROUGH EARLY EVENING. THE WIND SHOULD DIMINISH JUST ENOUGH BY DAYBREAK THAT SOME RADIATIONAL COOLING WILL OCCUR SO TONIGHT WILL BE COOLER THAN RECENT NIGHTS...IN THE 60S. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH SATURDAY NIGHT/... JET TO DRIFT BACK NORTH LATE THIS WEEK. DIVERGENCE ZONE/RING OF FIRE TO SLIDE BACK NORTH AS WELL. WE SHOULD BE IN GOOD SHAPE MOST OF THURSDAY AS THE SURFACE HIGH IS OVERHEAD AND THE AIR MASS IS PROGGED TO BE STABLE. DEWPOINT WILL BE A LITTLE LOWER...IN THE 60S...SO IT WILL BE ANOTHER WARM DAY BUT NOT QUITE AS OPPRESSIVE. VIRTUALLY ALL OF THE MODELS DEVELOP THUNDERSTORMS ACROSS THE NORTHERN PLAINS ON THURSDAY AND MOVE THEM EASTWARD IN THE STRONG DIFFERENTIAL ADVECTION. RIDGING ALOFT PROGGED TO CONTINUE SO THE STORMS WILL BE LESS LIKELY TO REDEVELOP SHARPLY SOUTHEAST BUT SHOWERS/STORMS COULD CERTAINLY CLIP THE FORECAST AREA THURSDAY NIGHT INTO FRIDAY. THE BEST CHANCE WOULD BE FARTHER NORTH...ESPECIALLY EAST OF CLEVELAND AND ACROSS NORTHWEST PENNSYLVANIA BY EARLY FRIDAY MORNING INTO THE DAY FRIDAY. OFTEN OUTFLOW BOUNDARIES CAN PULSE SOUTHWARD ACROSS LAKE ERIE FROM THESE TYPES OF SYSTEMS AND THEY COULD SPAWN NEW STORM DEVELOPMENT ON FRIDAY. WILL NOT GO AS HIGH WITH THE POP AS THE GFS/MAV GUIDANCE GIVEN THE PROPENSITY FOR THE GFS TO BE TOO WET IN THIS TYPE OF PATTERN BUT WILL ALLOW FOR CHANCE/SCATTERED CONVECTION. IN ANY CASE IT WILL GET HOT ON FRIDAY...WITH HIGHS GENERALLY 90 TO 95 EXCEPT PERHAPS HOLDING IN THE MID/UPPER 80S ACROSS EXTREME NE OH/NW PA WHERE THERE MAY BE MORE CLOUDS/CONVECTION. TIMING OF THE MAIN COLD FRONT IS STILL IN QUESTION. THE GFS DROPS THE FRONT ACROSS THE AREA SATURDAY NIGHT AND IT IS SOUTHEAST BY SUNDAY MORNING. THE 00Z ECMWF AND THE 12Z ECMWF A LITTLE SLOWER. THE GFS HAS ACTUALLY DONE A DECENT JOB THIS SUMMER WITH THESE NW FLOW WEAK COLD FRONTS. WILL LEAN TOWARD GETTING THE SHOWERS/STORMS THROUGH THE AREA BY SUNDAY MORNING. SUNDAY WOULD BE LESS HUMID WITH DEWPOINTS FALLING THROUGH THE 60SS AND SOMEWHAT COOLER WITH TEMPERATURES IN THE 80S. MOST MODELS INDICATE THAT THE NORTHWEST FLOW PATTERN WILL PERSIST NEXT WEEK WITH WEATHER AND TEMPERATURES MORE SEASONABLE. && .LONG TERM /SUNDAY THROUGH WEDNESDAY/... HIGH PRESSURE BUILDS INTO THE REGION FOR MONDAY AND TUESDAY. A BIT OF RELIEF IN THE TEMPERATURE DEPARTMENT WITH THIS CHANGE IN AIRMASS AND WILL COME BACK TO NORMAL. RETURN FLOW WEDNESDAY AND TEMPS/DEWPOINTS INCREASE AND A WARM FRONT APPROACHES. && .AVIATION /20Z WEDNESDAY THROUGH MONDAY/... COLD FRONT ACROSS NORTHWEST OHIO AS OF 17Z. ISOLATED SHRA/TS POSSIBLE EAST OF I-71 CORRIDOR THIS AFTERNOON TO EARLY EVENING AND THEN THAT IS IT. BEST STORMS WOULD BE NEAR ERI. DRIER AIR WORKS IN FROM THE NORTHWEST TONIGHT...BUT EASTERN LOCATIONS MAY HAVE A LITTLE MVFR BR FIRST THING THURSDAY MORNING. CU FIELD FOR THURSDAY AND SOME HIGH CLOUDS. .OUTLOOK...NON-VFR CONDITIONS IN SCATTERED SHRA/TSRA LATE THURSDAY THROUGH SATURDAY EVENING AND BRIEFLY WITH EARLY MORNING FOG/HAZE. && .MARINE... SEVERE THUNDERSTORM WATCH WAS ISSUED FOR THE WESTERN TWO THIRDS OF THE LAKE UNTIL 9 PM THIS EVENING AND UNTIL 8 PM THIS EVENING FOR THE EASTERN THIRD. STRONG THUNDERSTORMS WILL CONTINUE TO MOVE SOUTH ACROSS THE LAKE THIS AFTERNOON AND WILL BE MONITORED FOR SEVERE POTENTIAL. WINDS AND WAVES ARE EXPECTED TO BE FAIRLY LIGHT THROUGH THURSDAY NIGHT AND THEN AN INCREASE IN THE WINDS IS EXPECTED FOR FRIDAY OUT OF THE WEST TO SOUTHWEST. GRADIENT INCREASES OVER THE LAKE AND THIS WILL CAUSE WAVES TO REACH SMALL CRAFT CRITERIA. SO SMALL CRAFT ADVISORIES WILL LIKELY BE NEEDED FRIDAY INTO FRIDAY NIGHT. AFTER STORM SYSTEM MOVES EAST OF THE AREA SATURDAY NIGHT WITH TRAILING COLD FRONT...WINDS WILL DIMINISH AND WAVES WILL SUBSIDE JUST IN TIME FOR THE WEEKEND. SHOULD BE A RELATIVELY GOOD BOATING WEEKEND. && .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/CORRECTED
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CLEVELAND OH 548 AM EDT WED JUL 21 2010 LEZ061-142>149-162>169-OHZ003-006>014-017>023-027>033-036>038-047- 089-PAZ001>003-221000- 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- 548 AM EDT WED JUL 21 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE...NORTH CENTRAL OHIO...NORTHEAST OHIO...NORTHWEST OHIO AND NORTHWEST PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. SCATTERED SHOWERS AND THUNDERSTORMS WILL OCCUR TODAY. A FEW OF THESE STORMS MAY BE SEVERE WITH THE MAIN THREAT OF SEVERE WEATHER BEING FROM DAMAGING WINDS AND LOCALIZED HEAVY RAINFALL. DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. STRONG TO SEVERE THUNDERSTORMS MAY OCCUR AT TIMES THURSDAY NIGHT INTO SATURDAY NIGHT. THEY WILL BE ASSOCIATED WITH A WARM FRONT THAT SHOULD MOVE THROUGH ON FRIDAY...AND THEN IN ADVANCE OF A COLD FRONT THAT WILL LIKELY MOVE ACROSS THE AREA SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY.
The Cleveland radar (KCLE), 35 km away, was scanning. The volume nearest the first event began at 20:11 UTC.
9 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds uprooted a three and a half foot diameter tree. Several other large trees nearby were also downed by the thunderstorm winds.
Thunderstorm winds downed a few large trees in Litchfield.
Thunderstorm winds downed a few large limbs near Penfield.
Thunderstorm winds downed several large limbs. The limbs fell and damaged vehicles. An evergreen tree fell onto a house, and a barn was moved ten feet off its foundation.
Thunderstorm winds downed several large limbs.
Thunderstorm winds downed a large tree onto a house.
Thunderstorm winds downed a couple of large trees.
Thunderstorm winds downed a large tree.
Thunderstorm winds downed a couple of large trees. A cable line also went down due to the thunderstorm winds.
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: 240115, 240117, 240118, 240170, 240116, 240129, 240157, 240167, 240160.