Thunderstorms developed over northeastern Oklahoma along a warm front and an outflow boundary from earlier thunderstorms. Tornadoes, large hail, damaging winds, and flash flooding were observed with these thunderstorms. This event continued into the early morning hours of May 1st.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 30-APR-12 18:48:00 to 30-APR-12 18:48:00 (CST-6)
Location: NOWATA
Magnitude: 52.00 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 30-APR-12 22:19:00 to 30-APR-12 22:19:00 (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 several large tree limbs.

Thunderstorm Wind in PAWNEE, OKLAHOMA
From 30-APR-12 22:40:00 to 30-APR-12 22:40:00 (CST-6)
Location: RALSTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Strong thunderstorm wind blew down large tree limbs.

Flash Flood in NOWATA, OKLAHOMA
From 30-APR-12 20:15:00 to 30-APR-12 23:00:00 (CST-6)
Location: SOUTH COFFEYVILLE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Very heavy rainfall resulted in widespread flash flooding. A few homes were flooded and multiple roads were barricaded in town due to high water.

Flash Flood in PAWNEE, OKLAHOMA
From 30-APR-12 23:00:00 to 30-APR-12 23:59:00 (CST-6)
Location: RALSTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several county roads were briefly flooded near and just east of Ralston.

Thunderstorm Wind in OSAGE, OKLAHOMA
From 30-APR-12 23:10:00 to 30-APR-12 23:10:00 (CST-6)
Location: WYNONA
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Oklahoma Mesonet station near Wynona measured 70 mph thunderstorm wind gusts.

Thunderstorm Wind in OSAGE, OKLAHOMA
From 30-APR-12 23:25:00 to 30-APR-12 23:25:00 (CST-6)
Location: AVANT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong thunderstorm wind blew down large tree limbs.

Thunderstorm Wind in NOWATA, OKLAHOMA
From 30-APR-12 23:55:00 to 30-APR-12 23:55:00 (CST-6)
Location: DELAWARE
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down large trees onto a home.

Hail in NOWATA, OKLAHOMA
From 30-APR-12 18:48:00 to 30-APR-12 18:48:00 (CST-6)
Location: NOWATA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in NOWATA, OKLAHOMA
From 30-APR-12 19:10:00 to 30-APR-12 19:10:00 (CST-6)
Location: NOWATA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm spotters reported a brief tornado. Large tree limbs were snapped by this tornado.

Tornado in NOWATA, OKLAHOMA
From 30-APR-12 19:12:00 to 30-APR-12 19:12:00 (CST-6)
Location: NOWATA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm spotters reported a brief tornado. The tornado snapped hardwood trees.

Tornado in NOWATA, OKLAHOMA
From 30-APR-12 19:25:00 to 30-APR-12 19:25:00 (CST-6)
Location: NOWATA ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm spotters reported a brief tornado over open country. This tornado produced no known damage.

Tornado in NOWATA, OKLAHOMA
From 30-APR-12 19:33:00 to 30-APR-12 19:33:00 (CST-6)
Location: NOWATA ARPT
Tornado F-scale: EF0
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Storm spotters reported a brief tornado. The tornado blew down power poles and power lines.

Tornado in NOWATA, OKLAHOMA
From 30-APR-12 19:59:00 to 30-APR-12 20:03:00 (CST-6)
Location: CHILDERS
Tornado F-scale: EF1
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado snapped a number of hardwood trees and damaged a large barn. Maximum estimated wind in the tornado based on this damage was 95 to 105 mph.

Tornado in NOWATA, OKLAHOMA
From 30-APR-12 23:42:00 to 30-APR-12 23:48:00 (CST-6)
Location: GLENOAK
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado snapped and uprooted numerous hardwood trees and damaged several barns. Maximum estimated wind in the tornado based on this damage was 105 to 115 mph.

Tornado in CRAIG, OKLAHOMA
From 30-APR-12 21:05:00 to 30-APR-12 21:06:00 (CST-6)
Location: CENTRALIA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser videotaped a brief tornado over open country. The tornado produced no known damage.

Thunderstorm Wind in OSAGE, OKLAHOMA
From 30-APR-12 23:06:00 to 30-APR-12 23:06:00 (CST-6)
Location: HOMINY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm wind blew down large tree limbs.