At the surface, an occluded low drifted northeastward across far-northwestern ON and Hudson Bay during the late afternoon of August 30th through the first couple predawn hours of the 31st. Simultaneously, the attendant warm front drifted eastward across the OH/PA border region and toward central portions of NY and PA, while the trailing cold front moved eastward from the southwestern Great Lakes…
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.
At the surface, an occluded low drifted northeastward across far-northwestern ON and Hudson Bay during the late afternoon of August 30th through the first couple predawn hours of the 31st. Simultaneously, the attendant warm front drifted eastward across the OH/PA border region and toward central portions of NY and PA, while the trailing cold front moved eastward from the southwestern Great Lakes and Lower MO Valley to north-central OH and the Lower to Mid OH Valley. Within the warm and moist sector between these two fronts, isolated to scattered multicell thunderstorms developed in northern OH and produced isolated straight-line convective wind damage amidst weak to moderate MUCAPE, moderate to strong DCAPE, and moderate effective bulk shear during the late afternoon through late evening.
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 30, 12:18 PM EST, 2 hours 31 minutes earlier.
Area Forecast Discussion National Weather Service Cleveland OH 118 PM EDT Fri Aug 30 2024 .SYNOPSIS... A warm front will lift north across the area this morning, followed by a cold front tonight into Saturday morning. Another cold front is expected to track across the region on Sunday, followed by Canadian high pressure early next week. && .NEAR TERM /THROUGH SATURDAY/... 1230 PM update... Some minor adjustments to pops and temperatures to reflect the current trends, otherwise the forecast largely remains on track for this afternoon into the evening hours. Focus now turns to convective development over the next 6 hours. Current thinking aligns with latest HRRR trends that convection will be rather isolated in nature, with the best chances for initiation being across northeast Ohio during the mid afternoon hours, where latest SPC mesoanalysis indicated upwards of 3000 j/kg SBCAPE. With the lack of deep layer shear and ample dry air aloft, reflected by DCAPE values near 1200 j/kg, any storms could be capable of isolated damaging winds with downbursts. SPC has maintained much of the area in a marginal risk which is appropriate given the convective coverage and damaging wind risk despite a lack of organized storm activity. Severe chances should diminish diurnally after sunset although pops increase ahead of the approaching boundary. Original Discussion... Upper level low/surface low tandem over the eastern Canadian prairies will track northeastward towards James Bay. Occluded system will bring a warm front into the CWA Friday. Expecting a distinct increase in the MLCAPE in the brief residence time within the warm sector. POPs are reintroduced gradually after 18Z, however, despite the instability in place, off surface flows are on the weaker side and RH above the boundary layer is also hard to come by at first. The low and mid level moisture will increase with advection ahead of the cold front late Friday night into Saturday, increasing the convective chances accordingly. There is a marginal risk of severe weather in place with the thunderstorm chances, but the low level jet will set up north of the area in SE Michigan through southern Ontario. Could get a hint of the low level jet in far NE Ohio/NW Pennsylvania after 00Z Saturday and with hints just ahead of the cold front, so the low end severe threat will be carried overnight tonight. Expecting the convection to pulse up Saturday with increased heating, especially in the southeastern CWA as the cold front makes its exit. Marginal threat carries through until it does so from Crawford PA to Knox OH Saturday afternoon/evening. Temperatures on the sharp increase for today in the warm sector with roughly 90-95F I-77 and west, and 85-90F east of I-77. Mild overnight, then cooler Saturday with upper 70s to lower 80s. && .SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/... The cold front will be south and east of the local area by Saturday night while the parent upper trough lingers overhead the eastern Great Lakes. Mainly dry weather through the short term as a much drier air moves in behind the frontal passage Saturday night. A secondary cold front will sag southward across Lake Erie Sunday afternoon which may lead to some showers to develop across Northeast Ohio and Northwest Pennsylvania. Have continued the trend of 20-30% PoPs through early Sunday evening. Canadian high pressure builds overhead by the beginning of the week introducing a dry, but cool, period. Temperatures remain near normal Saturday night and during the day Sunday with overnight lows in the upper 50s and afternoon highs in the lower 80s. As the Canadian high builds overhead anticipate a period of cooler conditions with overnight lows in the upper 40s to lower 50s Sunday and Monday night and afternoon highs on Monday in the low 70s. && .LONG TERM /TUESDAY THROUGH FRIDAY/... Canadian high pressure remains over the Great Lakes region before gradually building eastward toward the mid-Atlantic region through the long term period. Below normal temperatures in the mid to upper 70s Tuesday. High temperatures return to their normal values in the low/mid 80s by Wednesday and Thursday. && .AVIATION /18Z Friday THROUGH Wednesday/... Mainly VFR conditions expected through much of the period as a warm front lifts north of the terminals at the onset of the period. Scattered TSRA possible ahead of a cold front that moves southeast across the terminals tonight into Saturday. Some MVFR ceilings cannot be ruled out with the cold front toward the end of the period. Coverage may increase a bit Saturday at southeast terminals (KCAK, KMFD, KYNG) but coverage expected to be scattered enough to preclude prevailing TS mention at the moment. Light winds expected, generally 10 kts or less outside TSRA, through the period, with southwest flow at the onset becoming variable overnight and westerly behind the cold front near the end of the period. Outlook...VFR expected. && .MARINE... Easterly winds 10-15 knots early this morning turn southeasterly by this afternoon while decreasing to 10-12 knots. By late tonight, a warm front will lift northeast across the lake and allow for winds to turn westerly and increase to 10-15 knots. A cold front will swing east across the lake on Saturday with westerly winds generally remaining between 10-15 knots. A secondary cold front Sunday afternoon will allow for winds to turn northerly while increasing to 15-20 knots. Onshore flow will likely lead to wave heights building to 2-4 feet across the central basin. Small Craft Advisories and Beach Hazard Statements may be needed for this brief window of elevated winds and waves Sunday night into Monday. Quieter marine conditions by early next week as high pressure builds overhead the Great Lakes region. && .CLE WATCHES/WARNINGS/ADVISORIES... OH...None. PA...None. NY...None. MARINE...None. && SYNOPSIS...26 NEAR TERM...Greenawalt/26 SHORT TERM...Iverson LONG TERM...Iverson AVIATION...Greenawalt MARINE...Iverson
Hazardous Weather Outlook National Weather Service Cleveland OH 313 AM EDT Fri Aug 30 2024 LEZ061-142>149-162>169-OHZ003-006>014-017>023-027>033-036>038-047- 089-PAZ001>003-310715- Ripley to Buffalo NY extending from 5NM off shoreline to US- Canadian border-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- Detroit River Lt. to Maumee Bay OH to Reno Beach OH beyond 5NM offshoreline to US-Canadian border- Reno Beach to The Islands OH beyond 5NM off shoreline to US- Canadian border- The Islands to Vermilion OH beyond 5 nm off shoreline to US- Canadian border- Vermilion to Avon Point OH beyond 5 nm off shoreline to US- Canadian border- Avon Point to Willowick OH beyond 5 nm off shoreline to US- Canadian border-Willowick to Geneva-on-the- Lake OH beyond 5NM off shoreline to US-Canadian border-Geneva-on-the- Lake to Conneaut OH beyond 5 nm off shoreline to US-Canadian border- Conneaut OH to Ripley NY beyond 5 nm off shoreline to US- Canadian border-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- 313 AM EDT Fri Aug 30 2024 This Hazardous Weather Outlook is for Lake Erie, north central Ohio, northeast Ohio, northwest Ohio and northwest Pennsylvania. .DAY ONE...Today and tonight. Scattered thunderstorms are possible this afternoon through tonight with the primary threat being damaging wind gusts. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Cleveland OH
231 PM EDT Fri Aug 30 2024
OHZ020-021-301900-
Summit OH-Medina OH-
231 PM EDT Fri Aug 30 2024
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN MEDINA AND WEST
CENTRAL SUMMIT COUNTIES THROUGH 300 PM EDT...
At 231 PM EDT, Doppler radar was tracking a strong thunderstorm near
Medina, moving east at 10 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Medina, Brunswick, North Royalton, Chippewa Lake, Broadview Heights,
Brecksville, Hinckley, Fairlawn, Richfield, Chippewa-On-The-Lake,
Montrose-Ghent, Briarwood Beach, and Pigeon Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4106 8193 4123 8191 4128 8173 4128 8164
4107 8163
TIME...MOT...LOC 1831Z 260DEG 10KT 4116 8180
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
SefcovicPreliminary Local Storm Report
National Weather Service Cleveland OH
252 PM EDT Fri Aug 30 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0228 PM Marine Tstm Wind 1 NNE Cleveland 41.52N 81.68W
08/30/2024 M39 MPH Cuyahoga OH ASOS
ASOS station KBKL Cleveland Burke Lakefront
Airport reported a 34 kt marine thunderstorm
wind gust.
&&
SefcovicSpecial Weather Statement
National Weather Service Cleveland OH
257 PM EDT Fri Aug 30 2024
OHZ012>014-301930-
Geauga OH-Lake OH-Ashtabula Inland OH-
257 PM EDT Fri Aug 30 2024
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN GEAUGA...
NORTHEASTERN LAKE AND SOUTHWESTERN ASHTABULA COUNTIES THROUGH 330 PM
EDT...
At 256 PM EDT, Doppler radar was tracking a strong thunderstorm near
Madison, or 11 miles south of Geneva-On-The-Lake, moving east at 15
mph.
HAZARD...Wind gusts of 50 to 55 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Geneva, Madison, Austinburg, Montville, Hartsgrove, Roaming Shores,
Thompson, Rock Creek, and Plymouth Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4157 8069 4158 8106 4176 8110 4178 8103
4178 8100 4179 8096 4184 8074
TIME...MOT...LOC 1856Z 262DEG 13KT 4169 8099
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH
SefcovicSpecial Weather Statement
National Weather Service Cleveland OH
257 PM EDT Fri Aug 30 2024
OHZ020-021-301930-
Summit OH-Medina OH-
257 PM EDT Fri Aug 30 2024
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL MEDINA AND NORTHERN
SUMMIT COUNTIES THROUGH 330 PM EDT...
At 257 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Cuyahoga Falls, or 8 miles northwest of Akron, moving
east at 25 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Akron, Cuyahoga Falls, Kent, Hudson, Twinsburg, Tallmadge,
Streetsboro, Macedonia, Mogadore, Stow, Norton, Hinckley, Fairlawn,
Munroe Falls, Richfield, Silver Lake, Boston Heights, Peninsula,
Montrose-Ghent, and Pigeon Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4106 8173 4114 8181 4124 8176 4130 8140
4125 8139 4105 8139
TIME...MOT...LOC 1857Z 264DEG 22KT 4116 8166
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
SefcovicSpecial Weather Statement
National Weather Service Cleveland OH
329 PM EDT Fri Aug 30 2024
OHZ020>022-031-302000-
Summit OH-Portage OH-Medina OH-Wayne OH-
329 PM EDT Fri Aug 30 2024
...STRONG THUNDERSTORMS WILL IMPACT WESTERN PORTAGE...SOUTHEASTERN
MEDINA...SUMMIT AND NORTHEASTERN WAYNE COUNTIES THROUGH 400 PM EDT...
At 329 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Cuyahoga Falls to near Wadsworth to
Creston. Movement was east-southeast at 15 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Akron, Cuyahoga Falls, Kent, Barberton, Green, Hudson, Wadsworth,
Twinsburg, Tallmadge, Streetsboro, Macedonia, Rittman, Mogadore,
Doylestown, Creston, Mantua, Stow, Aurora, New Franklin, and Norton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4096 8199 4130 8154 4129 8120 4098 8137
4098 8142 4093 8142 4091 8151 4091 8164
4089 8165
TIME...MOT...LOC 1929Z 302DEG 11KT 4119 8158 4105 8170 4097 8192
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
JaszkaSpecial Weather Statement
National Weather Service Cleveland OH
334 PM EDT Fri Aug 30 2024
OHZ013-302000-
Geauga OH-
334 PM EDT Fri Aug 30 2024
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL GEAUGA COUNTY THROUGH
400 PM EDT...
At 334 PM EDT, Doppler radar was tracking a strong thunderstorm near
Chesterland, or near Chardon, moving east at 20 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Chardon, South Russell, Middlefield, Burton, Chesterland, Huntsburg,
Claridon, Montville, and Aquilla.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4144 8100 4144 8136 4157 8136 4157 8130
4159 8129 4167 8100
TIME...MOT...LOC 1934Z 255DEG 19KT 4152 8128
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
JaszkaThe Cleveland radar (KCLE), 54 km away, was scanning. The volume nearest the first event began at 19:47 UTC.
7 thunderstorm wind. Local standard time, as filed.
Trees downed along OH Route 44, about four-miles southwest of Burton.
Trees downed in Creston.
Trees downed throughout Seville.
Tree downed along Hubbard Valley Road on the northeast side of Seville.
Tree fell in Bezetta Township, about three-miles WSW of Cortland.
Tree downed in Cortland.
Several trees downed in Attica.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2024Every state in 2024This day in weather historyWarnings in Ohio, August 2024
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: 1242056, 1242087, 1245147, 1245149, 1245150, 1245152, 1245159.