Showers and thunderstorms developed over northern Ohio during the afternoon of July 28th. At least one of the stronger thunderstorms became severe.
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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.
Showers and thunderstorms developed over northern Ohio during the afternoon of July 28th. At least 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 Jul 28, 2:55 PM EST, 35 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CLEVELAND OH 355 PM EDT THU JUL 28 2011 .SYNOPSIS... A VERY WARM AND HUMID AIR MASS OVER THE REGION WILL COOL SLIGHTLY AND BECOME JUST A BIT LESS HUMID AS A DIFFUSE FRONT CROSSES THE REGION FRIDAY EVENING. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... CONVECTION HAS DEVELOPED ACROSS NORTHWEST OHIO IS THE AREA WHERE DEWPOINTS HAVE REACHED THE MID TO UPPER 70S WITH MIXED LAYER CAPES REACHING ABOUT 2000 J/KG WITH LITTLE OR NO CAP. WESTERLY FLOW WILL ADVECT THIS ACTIVITY EAST THIS EVENING ACROSS THE NORTHERN OHIO. SHORT TERM MODEL GUIDANCE WAS NOT USEFUL IN SHOWING THE CURRENT CONVECTIVE DEVELOPMENT. WILL MENTION CHANCE TO LIKELY POPS THIS EVENING. VERY HUMID CONDITIONS WILL SLOW DIURNAL COOLING UNLESS WIDESPREAD CONVECTIVE OUTFLOWS PREVAIL. FOR NOW WILL RAISE TEMPERATURES ABOVE THE MAV GUIDANCE. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY NIGHT/... VERY WARM AND HUMID AIR MASS OVER THE REGION WILL COOL SLIGHTLY OVER THE WEEK END AS THE WESTERLIES SAG SOUTHWARD WITH THE PROGRESSION OF COUPLE OF WEAK SHORT WAVES. 850 MB TEMPERATURES WILL DROP FROM 20-22C TO 18-20 WITH A SLIGHT DECREASE IN SURFACE DEW POINTS. THE RISK OF SCATTERED CONVECTION WILL CONTINUE INTO FRIDAY EVENING BEFORE SLIGHTLY MORE STABLE AIR GRADUALLY FILTERS INTO THE REGION. WILL USE MAV GUIDANCE WITH MINOR CHANGES. && .LONG TERM /MONDAY THROUGH THURSDAY/... NO BIG CHANGES TO THE LONG TERM PORTION OF THE FORECAST. MODELS IN GENERAL SHOW BROAD UPPER HIGH PRESSURE ACROSS MUCH OF THE CENTRAL UNITED STATES WITH A WEST TO NORTHWEST FLOW ALOFT ACROSS THE FORECAST AREAS. THIS WILL CONTINUE TO SUPPORT ABOVE NORMAL TEMPERATURES THROUGH AT LEAST THE FIRST HALF OF THE WEEK WITH THE CHANCE OF HAVING WEAK COLD FRONTS AND CONVECTIVE SYSTEMS DROP ACROSS THE AREA FROM THE NORTHWEST. WILL HAVE AFTERNOON HIGHS IN THE 85 TO 90 DEGREE RANGE MOST PLACES. BEST CHANCE FOR HAVING A COLD FRONT DROP ACROSS THE AREA APPEARED NOW TO OCCUR ON WEDNESDAY ALTHOUGH A WEAK BOUNDARY WILL ALSO DROP ACROSS THE AREA MONDAY. WILL HAVE LOW CHANCE POPS FOR MONDAY AFTERNOON NORTHEAST FOR THE WEAK BOUNDARY AND SWATH OF HIGHER RH. WILL CARRY A CHANCE POP WEDNESDAY TO COVER THE MIDWEEK COLD FRONT. THE FRONT HANGS AROUND IN THE AREA WEDNESDAY NIGHT AND THURSDAY SO WILL CONTINUE WITH A LOW CHANCE THEN AS WELL. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... DIURNAL TRENDS HAVE EMERGED ACROSS THE AREA IN THE WARM SECTOR...DECREASING AND THINNING CIGS FROM OVERNIGHT CONVECTION. CLOUDS HAVE SCATTERED ACROSS THE WEST AND SOUTH. ACROSS THE NORTHEAST COUNTIES VFR CIGS REMAIN. VISIBILITIES ARE MOSTLY VFR HOWEVER ACROSS THE WEST FROM FDY TO TOL...AND IN CAK...HAZE HAS DROPPED VISIBILITIES TO MVFR. EXPECT IMPROVING CONDITIONS AT THOSE LOCATIONS THROUGH THE EARLY AFTERNOON. FOR THE MID TO LATE AFTERNOON AND INTO THE EVENING...EXPECT CONVECTION TO REDEVELOP...MOST LIKELY TO THE WEST OF THE AREA WHERE THE AIRMASS IS MORE UNSTABLE. CONVECTION WOULD THEN LIKELY TRACK EAST INTO THE AREA. TIMING IS OF COURSE UNCERTAIN BUT STARTED THUNDER IN THE WEST FROM 20 TO 24Z AND THEN AT MFD 22-02Z. USED THE NAM12 TO GET AN INDICATION OR THE EVOLUTION ON TIMING FURTHER EAST. SOMEWHAT CONCERNED ABOUT THE LACK OF LOW LEVEL STABILITY SHOWING UP ON THE KCLE FORECAST SOUNDING THIS AFTERNOON AND EVENING. BROUGHT IN JUST SHOWERS OVERNIGHT WITH THUNDER VICINITY FRIDAY MORNING AS THE COLD FRONT DROPS INTO THE AREA. SIMILAR CONDITIONS EAST. OUTLOOK...NON VFR CEILINGS MAY OCCUR FRIDAY AFTERNOON IN SCATTERED THUNDERSTORMS AND MIST/FOG EARLY MORNINGS. && .MARINE... WARM FRONT BISECTING THE LAKE...BUT WILL PUSH OFF TO THE NORTHEAST TONIGHT. LOW PRESSURE WILL TRACK ACROSS MI/LK HURON AND INTO ONTARIO FRIDAY AND TAKE A COLD FRONT ACROSS LAKE ERIE DURING THE AFTERNOON. SOUTHWEST FLOW AHEAD OF THE FRONT MAY FUNNEL UP THE LAKE AND PRODUCE CONDITIONS CLOSE TO SMALL CRAFT ACROSS THE EAST END. OTHERWISE NOT MUCH WIND WITH THE FRONTS PASSAGE. HIGH PRESSURE CENTERED OVERHEAD THIS WEEKEND WILL YIELD LIGHT/VARIABLE AND DAYTIME ONSHORE FLOW. A WEAK FRONT WILL BRUSH THE GREAT LAKES LATE MONDAY BUT THEN HIGH PRESSURE RETURNS TO THE LAKE FOR TUESDAY. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...NONE. PA...NONE. MARINE...NONE. && SYNOPSIS...REL NEAR TERM...REL SHORT TERM...REL LONG TERM...TK AVIATION...TK MARINE...OUDEMAN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CLEVELAND OH 424 PM EDT THU JUL 28 2011 LEZ142>148-162>166-OHZ003-006>014-017>023-027>033-036>038-047-089- PAZ003-292030- 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- 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-CRAWFORD PA- 424 PM EDT THU JUL 28 2011 ...SEVERE THUNDERSTORM WATCH 695 IN EFFECT UNTIL 10 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE...NORTH CENTRAL OHIO...NORTHEAST OHIO...NORTHWEST OHIO AND NORTHWEST PENNSYLVANIA. .DAY ONE...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. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. HEAVY RAINFALL WILL AGAIN BE POSSIBLE ON FRIDAY AS A COLD FRONT SAGS SOUTHWARD ACROSS THE AREA. THIS MAY LEAD TO FLOODING IN A FEW LOCATIONS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. LEZ061-149-167>169-PAZ001-002-292030- LAKE ERIE OPEN WATERS FROM RIPLEY TO BUFFALO NY- 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- 424 PM EDT THU JUL 28 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR LAKE ERIE AND NORTHWEST PENNSYLVANIA. .DAY ONE...TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED.
The Cleveland radar (KCLE), 70 km away, was scanning. The volume nearest the first event began at 20:30 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds downed several trees and large limbs.
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: 336971.