A broken line of thunderstorms developed over northern Ohio on August 11th. There were a couple reports of damage from this 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 broken line of thunderstorms developed over northern Ohio on August 11th. There were a couple reports of damage from this line.
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, 8:24 AM EST, 1 hour 51 minutes earlier.
Area Forecast Discussion National Weather Service Cleveland OH 924 AM EDT Fri Aug 11 2017 .SYNOPSIS... A slow moving cold front will move across the area this afternoon and evening. High pressure and drier air will build in behind the front on Saturday and Sunday. && .NEAR TERM /THROUGH TONIGHT/... Update...Showers and storms are slowly moving eastward, generally over Lake Erie, this morning. The southern edge of these showers will try to affect portions of Lorain and Cuyahoga counties over the next few hours. A better chance for showers and storms will develop this afternoon, especially across the central and eastern portion of the forecast area. MLCAPE should get up to near 1000 J/Kg this afternoon thanks to cooler air aloft and diurnal heating. With 25 to 30 knots of 0-6 KM bulk shear, can't rule out a stronger storm with marginally severe hail and gusty winds. Have updated the PoPs to reflect what is currently going on. Original... Low pressure will move through the northern Great Lakes today and reach southwest Quebec Saturday morning. A cold front extending southwest from the low will move into the area this afternoon and exit east this evening. Expect showers and thunderstorms will develop along and ahead of the front with the first activity (pre-frontal) moving into northwest Ohio around dawn although diurnally, it should be at its weakest. Expect activity to become more widespread with heating so will have likely pops for all as the front moves west to east across the area. Will drop pops back to chance this evening and then drop pops from the west overnight. Saturday should be dry most places as high pressure builds intro the lower Ohio Valley. Did however keep a small chance northeast as a trough moves across the lake. Temps near normal today backing off to a few degrees below normal on Saturday. && .SHORT TERM /SATURDAY THROUGH MONDAY NIGHT/... The presence of the upper trough could help induce a few lake enhanced shra for the eastern part of the snowbelt Sat night and Sun. Otherwise, high pressure builds east over the area which should provide dry conditions. The other exception will be a weak system moving up the oh valley Sun night and Mon that could result in a few shra in the south. Temps will continue to run a little below normal. && .LONG TERM /TUESDAY THROUGH THURSDAY/... The upper trough will flatten into Wed but the surface high will remain over the area so think the wx will stay mostly dry as little in the way of lower level moisture will be able to spread into the area until late Thu or Thu night. Temps will show a gradual warming trend. && .AVIATION /12Z Friday THROUGH Tuesday/... Satellite/obs show MVFR/IFR stratus across much of the eastern half of the area while conditions remain VFR west. Convection however was moving into the western terminals at this time. Through the morning hours expect central and eastern terminals to lift from MVFR/IFR to VFR cigs. Scattered showers and thunderstorms will continue to move into the west early this morning. Expect this activity increase in coverage late morning and afternoon central and eastern counties with daytime heating. Drier air will move in from the west after midnight although guidance and bufkit soundings suggest scattered ifr cigs develop late tonight/toward dawn with early morning fog so have added MVFR stratus to terminals after 08z or so. OUTLOOK...Mainly VFR. && .MARINE... South winds of mainly 5 to 15 knots will turn to the NW tonight thru Sat with the passage of a cold front. High pressure will move ESE over the lake by late Sun and result in mainly light North to NE winds through the middle of next week. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...None. PA...None. MARINE...None. && SYNOPSIS...TK NEAR TERM...TK/Mottice SHORT TERM...Adams LONG TERM...Adams AVIATION...TK MARINE...Adams
Hazardous Weather Outlook National Weather Service Cleveland OH 559 AM EDT Fri Aug 11 2017 LEZ061-142>149-162>169-OHZ003-006>014-017>023-027>033-036>038-047- 089-PAZ001>003-121000- Lake Erie open waters from Ripley to Buffalo NY- Lake Erie nearshore waters from Maumee Bay to Reno Beach OH- Lake Erie nearshore waters from Reno Beach to The Islands OH- Lake Erie nearshore waters from The Islands to Vermilion OH- Lake Erie nearshore waters from Vermilion to Avon Point OH- Lake Erie nearshore waters from Avon Point to Willowick OH- Lake Erie nearshore waters from Willowick to Geneva-on-the Lake OH- Lake Erie nearshore waters from Geneva-on-the-Lake to Conneaut OH- Lake Erie nearshore waters from Conneaut OH to Ripley NY- Lake Erie open waters from Maumee Bay to Reno Beach OH- Lake Erie open waters from Reno Beach to The Islands OH- Lake Erie open waters from The Islands to Vermilion OH- Lake Erie open waters from Vermilion to Avon Point OH- Lake Erie open waters from Avon Point to Willowick OH- Lake Erie open waters from Willowick to Geneva-on-the-Lake OH- Lake Erie open waters from Geneva-on-the-Lake to Conneaut OH- Lake Erie open waters from Conneaut OH to Ripley NY-Lucas-Wood- Ottawa-Sandusky-Erie-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- 559 AM EDT Fri Aug 11 2017 This Hazardous Weather Outlook is for Lake Erie, north central Ohio, northeast Ohio, northwest Ohio and northwest Pennsylvania. .DAY ONE...Today and Tonight. Showers and thunderstorms are expected across the region today as a cold front moves through. A few of the thunderstorms may approach severe limits for hail and strong wind gusts. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Cleveland radar (KCLE), 60 km away, was scanning. The volume nearest the first event began at 15:17 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Thunderstorm winds downed a couple of trees near Concord.
Nickel sized hail was observed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2017Every state in 2017This day in weather historyWarnings in Ohio, August 2017
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: 719025, 719026.