A very unstable air mass was in place with temperatures in the 90s and dew points in the upper 70s.  While forcing was weak, there was enough lift ahead of a mid-level impulse to spark widespread convection in the form of a mesoscale convective system.

Thunderstorm Wind in DELAWARE, OHIO
From 04-AUG-10 12:59:00 to 04-AUG-10 13:04:00 (EST-5)
Location: LEWIS CENTER
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Minor structural damage occurred due to damaging thunderstorm winds.

Hail in GREENE, OHIO
From 04-AUG-10 13:01:00 to 04-AUG-10 13:10:00 (EST-5)
Location: YELLOW SPGS
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in FAYETTE, OHIO
From 04-AUG-10 13:23:00 to 04-AUG-10 13:27:00 (EST-5)
Location: JEFFERSONVILLE
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large limbs were reported down in addition to several large trees and power poles.  Half inch hail was also reported in the area.

Thunderstorm Wind in FRANKLIN, OHIO
From 04-AUG-10 13:18:00 to 04-AUG-10 13:23:00 (EST-5)
Location: COLUMBUS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Large branches were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in FAIRFIELD, OHIO
From 04-AUG-10 13:20:00 to 04-AUG-10 13:21:00 (EST-5)
Location: LANCASTER
Magnitude: 56.00 EG
Reported by: Public

The wind gust was estimated.

Thunderstorm Wind in CLERMONT, OHIO
From 04-AUG-10 14:11:00 to 04-AUG-10 14:16:00 (EST-5)
Location: EDENTON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in BROWN, OHIO
From 04-AUG-10 14:20:00 to 04-AUG-10 14:25:00 (EST-5)
Location: FAYETTEVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Law Enforcement

A tree was reported down due to damaging thunderstorm winds.

Thunderstorm Wind in PICKAWAY, OHIO
From 04-AUG-10 14:11:00 to 04-AUG-10 14:16:00 (EST-5)
Location: STRINGTOWN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in HOCKING, OHIO
From 04-AUG-10 14:12:00 to 04-AUG-10 14:17:00 (EST-5)
Location: LAURELVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree fell onto a house due to damaging thunderstorm winds.

Thunderstorm Wind in FAIRFIELD, OHIO
From 04-AUG-10 14:22:00 to 04-AUG-10 14:26:00 (EST-5)
Location: BREMEN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down due to damaging thunderstorm winds.

Thunderstorm Wind in HIGHLAND, OHIO
From 04-AUG-10 14:45:00 to 04-AUG-10 14:50:00 (EST-5)
Location: HILLSBORO
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large limbs were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in ROSS, OHIO
From 04-AUG-10 14:46:00 to 04-AUG-10 14:51:00 (EST-5)
Location: SUMMITHILL
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in MERCER, OHIO
From 04-AUG-10 11:11:00 to 04-AUG-10 11:16:00 (EST-5)
Location: COLDWATER
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two power poles were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in HARDIN, OHIO
From 04-AUG-10 11:55:00 to 04-AUG-10 12:00:00 (EST-5)
Location: KENTON
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were reported down in the southern half of the county.

Thunderstorm Wind in SHELBY, OHIO
From 04-AUG-10 12:00:00 to 04-AUG-10 12:05:00 (EST-5)
Location: HOUSTON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in LOGAN, OHIO
From 04-AUG-10 12:24:00 to 04-AUG-10 12:28:00 (EST-5)
Location: MIDDLEBURG
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees were snapped due to damaging thunderstorm winds.

Thunderstorm Wind in UNION, OHIO
From 04-AUG-10 12:33:00 to 04-AUG-10 12:34:00 (EST-5)
Location: MARYSVILLE
Magnitude: 50.00 MG
Reported by: AWOS

Thunderstorm Wind in LICKING, OHIO
From 04-AUG-10 13:30:00 to 04-AUG-10 13:35:00 (EST-5)
Location: FREDONIA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and branches were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in LICKING, OHIO
From 04-AUG-10 13:50:00 to 04-AUG-10 13:55:00 (EST-5)
Location: ST LOUISVILLE
Magnitude: 50.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

Trees were reported down and metal roofing was off of a shed due to damaging thunderstorm winds.

Thunderstorm Wind in LICKING, OHIO
From 04-AUG-10 13:25:00 to 04-AUG-10 13:30:00 (EST-5)
Location: UTICA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several large limbs were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in PICKAWAY, OHIO
From 04-AUG-10 13:45:00 to 04-AUG-10 13:50:00 (EST-5)
Location: CIRCLEVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Insurance Company

Several trees were reported down across the county.

Thunderstorm Wind in PICKAWAY, OHIO
From 04-AUG-10 13:40:00 to 04-AUG-10 13:45:00 (EST-5)
Location: NEW HOLLAND
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down due to damaging thunderstorm winds.

Hail in UNION, OHIO
From 04-AUG-10 12:35:00 to 04-AUG-10 12:40:00 (EST-5)
Location: MARYSVILLE
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in WARREN, OHIO
From 04-AUG-10 14:02:00 to 04-AUG-10 14:06:00 (EST-5)
Location: MORROW
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in DELAWARE, OHIO
From 04-AUG-10 12:48:00 to 04-AUG-10 12:55:00 (EST-5)
Location: DELAWARE
Magnitude: 55.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two tractor trailers were blown over and shingles were ripped off of a house due to damaging thunderstorm winds.

Thunderstorm Wind in FRANKLIN, OHIO
From 04-AUG-10 13:22:00 to 04-AUG-10 13:25:00 (EST-5)
Location: WESTERVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in UNION, OHIO
From 04-AUG-10 12:58:00 to 04-AUG-10 13:02:00 (EST-5)
Location: RICHWOOD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in CLARK, OHIO
From 04-AUG-10 12:40:00 to 04-AUG-10 12:45:00 (EST-5)
Location: SPRINGFIELD
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down due to damaging thunderstorm winds.  Power lines and several large branches were also reported down around the area.

Hail in GREENE, OHIO
From 04-AUG-10 12:40:00 to 04-AUG-10 12:45:00 (EST-5)
Location: FAIRBORN
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in GREENE, OHIO
From 04-AUG-10 12:48:00 to 04-AUG-10 12:52:00 (EST-5)
Location: FAIRBORN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several large tree limbs were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in MONTGOMERY, OHIO
From 04-AUG-10 12:25:00 to 04-AUG-10 12:26:00 (EST-5)
Location: SHILOH
Magnitude: 53.00 MG
Reported by: Trained Spotter

Hail in FAIRFIELD, OHIO
From 04-AUG-10 12:38:00 to 04-AUG-10 12:42:00 (EST-5)
Location: BALTIMORE
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in FRANKLIN, OHIO
From 04-AUG-10 13:09:00 to 04-AUG-10 13:10:00 (EST-5)
Location: (CMH)PORT COLUMBUS A
Magnitude: 51.00 MG
Reported by: ASOS

Thunderstorm Wind in FRANKLIN, OHIO
From 04-AUG-10 13:03:00 to 04-AUG-10 13:07:00 (EST-5)
Location: WESTERVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in AUGLAIZE, OHIO
From 04-AUG-10 11:25:00 to 04-AUG-10 11:29:00 (EST-5)
Location: WAPAKONETA
Magnitude: 78.00 EG
Property damage: 120.00K
Crop damage: 5.00K
Reported by: Emergency Manager

Damaging thunderstorm winds resulted in several barns being damaged or destroyed, several silos with major damage or destruction, trees down, and an old brick school being destroyed.

Thunderstorm Wind in DELAWARE, OHIO
From 04-AUG-10 13:03:00 to 04-AUG-10 13:04:00 (EST-5)
Location: KILBOURNE
Magnitude: 52.00 MG
Reported by: Public

Thunderstorm Wind in DELAWARE, OHIO
From 04-AUG-10 13:00:00 to 04-AUG-10 13:01:00 (EST-5)
Location: ASHLEY
Magnitude: 52.00 MG
Reported by: Trained Spotter

Thunderstorm Wind in LICKING, OHIO
From 04-AUG-10 13:09:00 to 04-AUG-10 13:14:00 (EST-5)
Location: JOHNSTOWN
Magnitude: 78.00 EG
Property damage: 110.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A microburst hit an egg facility causing the collapse of three large barns and damaging another.  This resulted in the fatalities of two men working in one of the collapsed structures.  A large rooftop air conditioning unit was also pushed off the roof of an adjacent administrative building.  Around the area there were several trees down and numerous broken limbs.  In addition to the fatalities, four injuries were also reported.

Thunderstorm Wind in LICKING, OHIO
From 04-AUG-10 13:34:00 to 04-AUG-10 13:39:00 (EST-5)
Location: BUCKEYE LAKE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were reported down due to damaging thunderstorm winds.  One of the trees fell onto a house.