A low pressure system moved slowly through the upper Midwest on May 11th. Northern Ohio was located in the warm sector out ahead of an approaching cold front.  A tornado watch was issued for northwest and north central Ohio with only isolated severe storms occurring. A Severe Thunderstorm Watch was later issued for northeast Ohio as the convection became more organized into a line with bowing segments.  Numerous areas received strong thunderstorm winds with downed trees and power lines.  The two main areas of wind damage occurred from eastern Cuyahoga County northeast into Lake County.  The other main area of damage occurred across Mahoning and Trumbull Counties.  Portions of Trumbull County and especially areas from Warren to Girard were likely the hardest hit with widespread trees and power lines down.  Many trees reportedly fell on homes and many areas lost power.

Thunderstorm Wind in CUYAHOGA, OHIO
From 11-MAY-15 18:08:00 to 11-MAY-15 18:12:00 (EST-5)
Location: SOLON
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees reported down in Solon and Gates Mills.

Thunderstorm Wind in MAHONING, OHIO
From 11-MAY-15 18:30:00 to 11-MAY-15 18:30:00 (EST-5)
Location: SEBRING
Magnitude: 50.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: State Official

Sebring Police Department reported widespread trees and power lines down in town from severe thunderstorm winds.

Thunderstorm Wind in LAKE, OHIO
From 11-MAY-15 18:32:00 to 11-MAY-15 18:32:00 (EST-5)
Location: MADISON
Magnitude: 50.00 EG
Property damage: 18.00K
Crop damage: 0.00K
Reported by: State Official

County dispatch reported several power lines brought down by thunderstorm winds in the town of Madison.

Thunderstorm Wind in HOLMES, OHIO
From 11-MAY-15 17:10:00 to 11-MAY-15 17:15:00 (EST-5)
Location: KILLBUCK
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained weather spotter reported severe thunderstorm winds brought down part of a tree in Killbuck with numerous trees and power lines down across the Millersburg area.

Thunderstorm Wind in GEAUGA, OHIO
From 11-MAY-15 18:10:00 to 11-MAY-15 18:10:00 (EST-5)
Location: BAINBRIDGE
Magnitude: 50.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Bainbridge Police reported a couple trees brought down by strong thunderstorm winds on Country Lane and Geauga Lake Rd. in Bainbridge Township.  Power lines were also down across Kinsman Road in Burton.

Thunderstorm Wind in TRUMBULL, OHIO
From 11-MAY-15 18:48:00 to 11-MAY-15 18:58:00 (EST-5)
Location: WARREN
Magnitude: 55.00 EG
Property damage: 120.00K
Crop damage: 0.00K
Reported by: State Official

Trumbull County Dispatch reported severe thunderstorm winds caused widespread trees and power lines down across the County, especially in Warren and Girard.  Numerous power outages in Warren and Girard with many trees on homes causing roof damage.

Thunderstorm Wind in KNOX, OHIO
From 11-MAY-15 16:45:00 to 11-MAY-15 16:45:00 (EST-5)
Location: MARTINSBURG
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: State Official

Knox County Sheriff reported several trees down in and near the town of Martinsburg.  Some trees were laying on power lines and power is out in Martinsburg.

Thunderstorm Wind in MAHONING, OHIO
From 11-MAY-15 18:32:00 to 11-MAY-15 18:32:00 (EST-5)
Location: LAKE MILTON
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

The public reported via social media that strong thunderstorm winds snapped several  large trees and that they were laying on power lines in the Milton Township area.

Thunderstorm Wind in LAKE, OHIO
From 11-MAY-15 18:22:00 to 11-MAY-15 18:22:00 (EST-5)
Location: PAINESVILLE CSMNT AR
Magnitude: 50.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Social Media

Social media reported a large tree and power lines down at the intersection of Riverside Drive and Nelmar Drive in Painesville Township.