A very hot and potentially unstable airmass interacted with northwesterly flow aloft to produce a derecho across northern Illinois. This derecho then moved rapidly east southeast across the Ohio Valley producing widespread straight line wind damage. This rare derecho affected nearly every county in southeast Indiana, northern Kentucky, and southwestern Ohio with severe winds. This caused widespread power outages that lasted several days in some locations. Isolated large hail also occurred with the stronger portions of the system.

Thunderstorm Wind in CAMPBELL, KENTUCKY
From 29-JUN-12 16:14:00 to 29-JUN-12 16:18:00 (EST-5)
Location: NEWPORT
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were reported down in the Newport area due to damaging thunderstorm winds.

Thunderstorm Wind in MASON, KENTUCKY
From 29-JUN-12 17:03:00 to 29-JUN-12 17:07:00 (EST-5)
Location: WASHINGTON
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Roof damage occurred to a Pizza Hut and numerous trees were downed in the area due to thunderstorm winds.

Thunderstorm Wind in KENTON, KENTUCKY
From 29-JUN-12 16:44:00 to 29-JUN-12 16:48:00 (EST-5)
Location: MORNING VIEW
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 ROBERTSON, KENTUCKY
From 29-JUN-12 17:03:00 to 29-JUN-12 17:15:00 (EST-5)
Location: HITTVILLE
Magnitude: 56.00 EG
Property damage: 90.00K
Crop damage: 0.00K
Reported by: Emergency Manager

One roof was completely ripped off of a barn with numerous reports of other barns also damaged due to thunderstorm winds. Trees were downed across the county.

Thunderstorm Wind in CAMPBELL, KENTUCKY
From 29-JUN-12 16:25:00 to 29-JUN-12 16:29:00 (EST-5)
Location: ALEXANDRIA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in GALLATIN, KENTUCKY
From 29-JUN-12 16:49:00 to 29-JUN-12 16:53:00 (EST-5)
Location: SPARTA
Magnitude: 61.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Canopies were blown over at Kentucky Motor Speedway due to thunderstorm winds.

Thunderstorm Wind in GALLATIN, KENTUCKY
From 29-JUN-12 16:42:00 to 29-JUN-12 16:46:00 (EST-5)
Location: SPARTA
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were uprooted and awnings were damaged at Kentucky Motor Speedway due to damaging thunderstorm winds. One crew member was injured.

Thunderstorm Wind in MASON, KENTUCKY
From 29-JUN-12 17:05:00 to 29-JUN-12 17:06:00 (EST-5)
Location: WASHINGTON
Magnitude: 52.00 MG
Reported by: Mesonet

Thunderstorm Wind in PENDLETON, KENTUCKY
From 29-JUN-12 16:58:00 to 29-JUN-12 17:03:00 (EST-5)
Location: FALMOUTH
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees were reported down due to damaging thunderstorm winds.

Thunderstorm Wind in BRACKEN, KENTUCKY
From 29-JUN-12 17:00:00 to 29-JUN-12 17:04:00 (EST-5)
Location: AUGUSTA
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed due to damaging thunderstorm winds.

Thunderstorm Wind in PENDLETON, KENTUCKY
From 29-JUN-12 17:15:00 to 29-JUN-12 17:19:00 (EST-5)
Location: MC KINNEYSBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were downed due to damaging thunderstorm winds.

Thunderstorm Wind in LEWIS, KENTUCKY
From 29-JUN-12 17:20:00 to 29-JUN-12 17:30:00 (EST-5)
Location: KINNICONICK
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed across the county due to damaging thunderstorm winds.

Thunderstorm Wind in GRANT, KENTUCKY
From 29-JUN-12 16:41:00 to 29-JUN-12 16:42:00 (EST-5)
Location: CRITTENDEN
Magnitude: 52.00 EG
Reported by: Trained Spotter

The spotter estimated the magnitude of the wind gust.