A stationary boundary stretched from west to east through northern Ohio during the morning hours of the 20th, and remained nearly stationary for the next several days. In addition to producing heavy rain a few of the thunderstorms became severe.

Thunderstorm Wind in RICHLAND, OHIO
From 20-AUG-07 13:57:00 to 20-AUG-07 14:10:00 (EST-5)
Location: KINGS CORNERS
Magnitude: 50.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A thunderstorm downburst moved southeast across southwestern Richland County and downed dozens of trees from near Kings Corner to near Bellville.  A distinct path of downed trees was observed.  The thunderstorm responsible for this downburst also produced a tornado that affected portions of Morrow and Richland Counties.

Tornado in MORROW, OHIO
From 20-AUG-07 13:55:00 to 20-AUG-07 13:57:00 (EST-5)
Location: SHAUCK
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An EF1 tornado touched down in northeastern Morrow County north of Shauck (Johnsville) shortly before 3 pm.  The tornado quickly moved southeast into Richland County.  In Morrow County, a distinct damage path of downed trees was observed.  The tornado was on the ground in Morrow County for perhaps one half mile and had a path no more than 50 yards in width.

Thunderstorm Wind in HOLMES, OHIO
From 20-AUG-07 14:20:00 to 20-AUG-07 14:20:00 (EST-5)
Location: NASHVILLE
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds uprooted several trees south of Nashville near the intersection of County Road 52 and Township Road 280.  One of the trees landed on a house causing damage.

Thunderstorm Wind in WYANDOT, OHIO
From 20-AUG-07 12:55:00 to 20-AUG-07 12:55:00 (EST-5)
Location: UPPER SANDUSKY
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed several trees.

Tornado in RICHLAND, OHIO
From 20-AUG-07 13:57:00 to 20-AUG-07 14:07:00 (EST-5)
Location: KINGS CORNERS
Tornado F-scale: EF1
Property damage: 125.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF1 tornado moved into southwestern Richland County from Morrow County around 3 pm.  This occurred west of Kings Corner along Kings Corner West Road.  Two farms in this area sustained damage from the tornado.  The tornado then moved southeast across U.S. Highway 42 and followed Kings Corner East Road for about a mile.  The tornado then crossed State Route 546 near Eckert Road and eventually lifted near the intersection of Mock Road and Mill Run Road after damaging another home.  The tornado had a damage path about four and a half miles long and no more than 50 yards wide in Richland County.  A distinctive damage path was visible in wooded areas.  The same thunderstorm that produced this tornado was also responsible for a downburst that downed many trees in southwestern Richland County.

Hail in RICHLAND, OHIO
From 20-AUG-07 13:55:00 to 20-AUG-07 13:55:00 (EST-5)
Location: MANSFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny to nickel size hail was reported south of Mansfield near the intersection of Interstate 71 and State Route 13.