A cold front moved into and across the region during the afternoon and evening of the 12th. A warm, moist, and unstable air mass existed over eastern Oklahoma ahead of the front. Thunderstorms developed along and ahead of the front during the afternoon and continued to affect eastern Oklahoma through the evening. The stronger storms produced large hail up to baseball size and damaging wind gusts.

Hail in SEQUOYAH, OKLAHOMA
From 12-MAY-11 17:02:00 to 12-MAY-11 17:02:00 (CST-6)
Location: SALLISAW
Magnitude: 1.50 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ADAIR, OKLAHOMA
From 12-MAY-11 17:05:00 to 12-MAY-11 17:05:00 (CST-6)
Location: BARON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OTTAWA, OKLAHOMA
From 12-MAY-11 17:05:00 to 12-MAY-11 17:05:00 (CST-6)
Location: FAIRLAND
Magnitude: 1.75 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SEQUOYAH, OKLAHOMA
From 12-MAY-11 17:05:00 to 12-MAY-11 17:05:00 (CST-6)
Location: SALLISAW
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PITTSBURG, OKLAHOMA
From 12-MAY-11 15:47:00 to 12-MAY-11 15:47:00 (CST-6)
Location: ARPELAR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCINTOSH, OKLAHOMA
From 12-MAY-11 16:00:00 to 12-MAY-11 16:00:00 (CST-6)
Location: HANNA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCINTOSH, OKLAHOMA
From 12-MAY-11 16:30:00 to 12-MAY-11 16:30:00 (CST-6)
Location: PIERCE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ADAIR, OKLAHOMA
From 12-MAY-11 16:53:00 to 12-MAY-11 16:53:00 (CST-6)
Location: STILWELL
Magnitude: 1.75 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Hail in OTTAWA, OKLAHOMA
From 12-MAY-11 16:56:00 to 12-MAY-11 16:56:00 (CST-6)
Location: AFTON
Magnitude: 2.50 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golfball to tennis ball size hail broke out windshields in automobiles and damaged roofs of homes.

Hail in OKMULGEE, OKLAHOMA
From 12-MAY-11 17:01:00 to 12-MAY-11 17:01:00 (CST-6)
Location: BEGGS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in OTTAWA, OKLAHOMA
From 12-MAY-11 17:26:00 to 12-MAY-11 17:26:00 (CST-6)
Location: WYANDOTTE
Magnitude: 2.00 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in TULSA, OKLAHOMA
From 12-MAY-11 17:30:00 to 12-MAY-11 17:30:00 (CST-6)
Location: LEONARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MUSKOGEE, OKLAHOMA
From 12-MAY-11 17:55:00 to 12-MAY-11 17:55:00 (CST-6)
Location: HASKELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PITTSBURG, OKLAHOMA
From 12-MAY-11 19:20:00 to 12-MAY-11 19:20:00 (CST-6)
Location: ASHLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in PUSHMATAHA, OKLAHOMA
From 12-MAY-11 17:50:00 to 12-MAY-11 17:50:00 (CST-6)
Location: ANTLERS
Magnitude: 57.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

A large tree was blown down across Highway 3.

Flash Flood in LE FLORE, OKLAHOMA
From 12-MAY-11 20:03:00 to 12-MAY-11 23:00:00 (CST-6)
Location: ARKOMA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Locally heavy rainfall resulted in flooding of several county roads.

Flash Flood in LE FLORE, OKLAHOMA
From 12-MAY-11 20:10:00 to 12-MAY-11 23:00:00 (CST-6)
Location: SCULLYVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several roads were closed due to flooding.

Hail in OTTAWA, OKLAHOMA
From 12-MAY-11 16:55:00 to 12-MAY-11 16:55:00 (CST-6)
Location: AFTON
Magnitude: 1.75 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in SEQUOYAH, OKLAHOMA
From 12-MAY-11 17:06:00 to 12-MAY-11 17:13:00 (CST-6)
Location: SALLISAW
Magnitude: 3.00 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

Hail larger than baseball size was reported in and near town by the public, the broadcast media, and amateur radio operators. The hail damaged homes, businesses, and automobiles.

Hail in MAYES, OKLAHOMA
From 12-MAY-11 16:00:00 to 12-MAY-11 16:00:00 (CST-6)
Location: PRYOR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CRAIG, OKLAHOMA
From 12-MAY-11 16:10:00 to 12-MAY-11 16:10:00 (CST-6)
Location: WELCH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Post Office

Hail in CRAIG, OKLAHOMA
From 12-MAY-11 16:27:00 to 12-MAY-11 16:27:00 (CST-6)
Location: WHITE OAK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Hail in CRAIG, OKLAHOMA
From 12-MAY-11 16:37:00 to 12-MAY-11 16:37:00 (CST-6)
Location: VINITA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in LE FLORE, OKLAHOMA
From 12-MAY-11 18:13:00 to 12-MAY-11 18:13:00 (CST-6)
Location: SPIRO
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm wind gusts near 70 mph were measured by emergency management.

Hail in SEQUOYAH, OKLAHOMA
From 12-MAY-11 16:58:00 to 12-MAY-11 16:58:00 (CST-6)
Location: SALLISAW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public