During the early morning hours of May 23, an area of low pressure entered the Upper Great Lakes Region. Substantial amounts of warm air and deep moisture entered northern Ohio from the southern United States. That instability lead to widespread severe weather, which began early in the afternoon in the western portions of the county warning area and persisted late into the evening.

Hail in ERIE, OHIO
From 23-MAY-11 17:27:00 to 23-MAY-11 17:27:00 (EST-5)
Location: VERMILION
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms produced nickel size hail.

Hail in CUYAHOGA, OHIO
From 23-MAY-11 18:20:00 to 23-MAY-11 18:20:00 (EST-5)
Location: PARMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced a swath of nickel to quarter size hail. Nickel hail was observed for a period of five minutes in North Royalton.

Thunderstorm Wind in CUYAHOGA, OHIO
From 23-MAY-11 18:15:00 to 23-MAY-11 18:15:00 (EST-5)
Location: PARMA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed several large branches.

Thunderstorm Wind in HOLMES, OHIO
From 23-MAY-11 21:00:00 to 23-MAY-11 21:00:00 (EST-5)
Location: WINESBURG
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds downed numerous large trees and large tree branches in the area.

Thunderstorm Wind in MARION, OHIO
From 23-MAY-11 20:17:00 to 23-MAY-11 20:17:00 (EST-5)
Location: GREEN CAMP
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds downed a large tree.

Thunderstorm Wind in RICHLAND, OHIO
From 23-MAY-11 20:25:00 to 23-MAY-11 20:25:00 (EST-5)
Location: BELLVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds downed several large trees in the area.

Thunderstorm Wind in LORAIN, OHIO
From 23-MAY-11 18:34:00 to 23-MAY-11 18:34:00 (EST-5)
Location: ELYRIA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds downed a large tree.

Thunderstorm Wind in OTTAWA, OHIO
From 23-MAY-11 16:11:00 to 23-MAY-11 16:11:00 (EST-5)
Location: GENOA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced an estimated wind gust of 60mph.

Thunderstorm Wind in OTTAWA, OHIO
From 23-MAY-11 16:13:00 to 23-MAY-11 16:13:00 (EST-5)
Location: OAK HARBOR
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced an estimated wind gust of 65mph.

Thunderstorm Wind in LORAIN, OHIO
From 23-MAY-11 18:34:00 to 23-MAY-11 18:34:00 (EST-5)
Location: NORTH RIDGEVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds downed a four foot diameter tree.

Hail in CUYAHOGA, OHIO
From 23-MAY-11 18:21:00 to 23-MAY-11 18:21:00 (EST-5)
Location: PARMA
Magnitude: 1.25 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced half dollar size hail.

Hail in CUYAHOGA, OHIO
From 23-MAY-11 18:33:00 to 23-MAY-11 18:33:00 (EST-5)
Location: NORTH ROYALTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced quarter size hail.

Hail in SUMMIT, OHIO
From 23-MAY-11 18:45:00 to 23-MAY-11 18:45:00 (EST-5)
Location: TWINSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced quarter size hail.

Thunderstorm Wind in SANDUSKY, OHIO
From 23-MAY-11 16:20:00 to 23-MAY-11 16:20:00 (EST-5)
Location: GIBSONBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds downed a large tree.

Thunderstorm Wind in LORAIN, OHIO
From 23-MAY-11 17:33:00 to 23-MAY-11 17:33:00 (EST-5)
Location: AMHERST
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorms produced an estimated wind gust of 60mph.

Hail in LAKE, OHIO
From 23-MAY-11 19:42:00 to 23-MAY-11 19:42:00 (EST-5)
Location: MADISON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms produced quarter size hail.

Hail in TRUMBULL, OHIO
From 23-MAY-11 20:01:00 to 23-MAY-11 20:01:00 (EST-5)
Location: (YNG)YOUNGSTOWN MUNI
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Quarter size hail was reported in the Youngstown Airport (YNG) observation (METAR).

Thunderstorm Wind in GEAUGA, OHIO
From 23-MAY-11 20:50:00 to 23-MAY-11 20:50:00 (EST-5)
Location: MIDDLEFIELD
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds downed two large trees.

Thunderstorm Wind in WOOD, OHIO
From 23-MAY-11 15:41:00 to 23-MAY-11 15:56:00 (EST-5)
Location: WESTON
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed several large tree limbs in Weston. As the severe thunderstorm tracked east, several large trees were downed in the Bowling Green area.

Thunderstorm Wind in PORTAGE, OHIO
From 23-MAY-11 21:39:00 to 23-MAY-11 21:49:00 (EST-5)
Location: MANTUA
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds downed numerous large trees.

Hail in LORAIN, OHIO
From 23-MAY-11 17:36:00 to 23-MAY-11 18:06:00 (EST-5)
Location: VERMILION ON THE LK
Magnitude: 1.75 
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced a large swath of hail ranging in size from nickels to golf balls. Locations across Lorain county, including Vermilion, Elyria, and North Ridgeville were hit hardest.  Many vehicles and some homes were damaged by the hail.

Hail in TRUMBULL, OHIO
From 23-MAY-11 19:48:00 to 23-MAY-11 19:53:00 (EST-5)
Location: VIENNA
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced golf ball size hail. Many vehicles were damaged as a result of the large hail.

Thunderstorm Wind in LORAIN, OHIO
From 23-MAY-11 17:59:00 to 23-MAY-11 17:59:00 (EST-5)
Location: NORTH RIDGEVILLE
Magnitude: 50.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed several large trees and telephone poles.

Hail in CUYAHOGA, OHIO
From 23-MAY-11 18:15:00 to 23-MAY-11 18:15:00 (EST-5)
Location: OLMSTED FALLS
Magnitude: 1.75 
Property damage: 90.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced golf ball size hail. Many vehicles as well as some homes were damaged during this event.

Hail in CUYAHOGA, OHIO
From 23-MAY-11 18:25:00 to 23-MAY-11 18:25:00 (EST-5)
Location: MIDDLEBURGH HGTS
Magnitude: 1.75 
Property damage: 90.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorms produced golf ball size hail. Numerous vehicles were damaged during this event.

Thunderstorm Wind in CUYAHOGA, OHIO
From 23-MAY-11 18:00:00 to 23-MAY-11 18:30:00 (EST-5)
Location: NORTH OLMSTED
Magnitude: 50.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A thunderstorm downburst caused a path of damage from North Olmsted to Berea to Middleburg Heights.  Dozens of trees were downed along the damage path which was intermittent.  Some of the downed trees blocked roads, including Interstate 71.  Damage occurred at a construction project at the Great Northern Mall in North Olmsted.  Thunderstorm winds damaged a food court roof and toppled a section of wall at the mall.  Several homes elsewhere along the damage path were damaged by the fallen trees.