Early morning thunderstorms developed over northeast Oklahoma in advance of a slow moving cold front. Damaging winds, large hail, and two tornadoes were produced by the strongest storms.

Thunderstorm Wind in PAWNEE, OKLAHOMA
From 15-APR-12 03:54:00 to 15-APR-12 03:54:00 (CST-6)
Location: PAWNEE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Oklahoma Mesonet station near Pawnee measured 58 mph thunderstorm wind gusts.

Thunderstorm Wind in PAWNEE, OKLAHOMA
From 15-APR-12 04:04:00 to 15-APR-12 04:04:00 (CST-6)
Location: RALSTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in OSAGE, OKLAHOMA
From 15-APR-12 04:10:00 to 15-APR-12 04:10:00 (CST-6)
Location: FAIRFAX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in OSAGE, OKLAHOMA
From 15-APR-12 04:18:00 to 15-APR-12 04:18:00 (CST-6)
Location: PAWHUSKA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in OSAGE, OKLAHOMA
From 15-APR-12 04:25:00 to 15-APR-12 04:25:00 (CST-6)
Location: PAWHUSKA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in WASHINGTON, OKLAHOMA
From 15-APR-12 04:54:00 to 15-APR-12 04:54:00 (CST-6)
Location: COPAN
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Oklahoma Mesonet station near Copan measured 65 mph thunderstorm wind gusts.

Hail in TULSA, OKLAHOMA
From 15-APR-12 04:56:00 to 15-APR-12 04:56:00 (CST-6)
Location: SAND SPGS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in TULSA, OKLAHOMA
From 15-APR-12 05:02:00 to 15-APR-12 05:02:00 (CST-6)
Location: COLLINSVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in CRAIG, OKLAHOMA
From 15-APR-12 05:43:00 to 15-APR-12 05:43:00 (CST-6)
Location: CENTRALIA
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind blew down large tree limbs and blew over an unanchored outbuilding.

Tornado in OSAGE, OKLAHOMA
From 15-APR-12 04:49:00 to 15-APR-12 04:55:00 (CST-6)
Location: SKIATOOK ARPT
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado damaged two airplanes and the roof of a hangar at the Skiatook Municipal Airport. It also snapped and uprooted large hardwood trees. Maximum wind in the tornado based on this damage was 90 to 100 mph.

Tornado in CHEROKEE, OKLAHOMA
From 15-APR-12 08:22:00 to 15-APR-12 08:35:00 (CST-6)
Location: STANDING ROCK
Tornado F-scale: EF1
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado damaged homes and destroyed several sheds and barns. It also snapped hardwood trees. Maximum estimated wind in the tornado based on this damage was 85 to 95 mph. The tornado continued into Adair County, Oklahoma.

Tornado in ADAIR, OKLAHOMA
From 15-APR-12 08:35:00 to 15-APR-12 08:36:00 (CST-6)
Location: TITANIC
Tornado F-scale: EF0
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is the second segment of this tornado. The tornado moved across Highway 51 snapping large tree limbs and destroying an unoccupied mobile home that was not tied down. Maximum estimated wind during this segment of the tornado based on this damage was about 75 mph. The tornado continued into Cherokee County, Oklahoma.

Tornado in CHEROKEE, OKLAHOMA
From 15-APR-12 08:36:00 to 15-APR-12 08:37:00 (CST-6)
Location: ELDON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is the third segment of this tornado. The tornado moved back into Cherokee County after crossing Highway 51. During this segment, the tornado snapped large tree limbs. Maximum estimated wind in the tornado based on this damage was about 75 mph. The tornado continued into Adair County, Oklahoma.

Tornado in ADAIR, OKLAHOMA
From 15-APR-12 08:37:00 to 15-APR-12 08:43:00 (CST-6)
Location: TITANIC
Tornado F-scale: EF0
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is the final segment of this tornado. The tornado moved back into Adair County just north of Highway 51 snapping large tree limbs and destroying a few sheds and outbuildings. Maximum estimated wind in the tornado during this segment based on this damage was about 70 mph.