Moderate northwest flow aloft existed over Oklahoma, with a diffuse frontal boundary extending west-east across the center of the state. Elevated thunderstorms developed in the early morning before sunrise, primarily near the I-35 corridor, and trained over a region roughly extending from Kingfisher to Durant. Damaging winds and marginally severe hail were reported, along with some flash flooding.

Thunderstorm Wind in CARTER, OKLAHOMA
From 23-MAY-13 08:15:00 to 23-MAY-13 08:15:00 (CST-6)
Location: DICKSON
Magnitude: 56.00 EG
Reported by: Amateur Radio

Estimated gust of 65 mph.

Hail in CANADIAN, OKLAHOMA
From 23-MAY-13 08:35:00 to 23-MAY-13 08:35:00 (CST-6)
Location: YUKON
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in BRYAN, OKLAHOMA
From 23-MAY-13 08:39:00 to 23-MAY-13 08:39:00 (CST-6)
Location: MEAD
Magnitude: 50.00 EG
Property damage: 0.10K
Reported by: Trained Spotter

Small tree limbs reported down.

Thunderstorm Wind in CARTER, OKLAHOMA
From 23-MAY-13 08:16:00 to 23-MAY-13 08:16:00 (CST-6)
Location: DICKSON
Magnitude: 56.00 EG
Reported by: Amateur Radio

Estimated gust to 65 mph.

Flash Flood in OKLAHOMA, OKLAHOMA
From 23-MAY-13 07:00:00 to 23-MAY-13 10:00:00 (CST-6)
Location: WHEATLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

County Line Road flooded between SW 44th and 59th St. No damage reported.

Flash Flood in CANADIAN, OKLAHOMA
From 23-MAY-13 08:00:00 to 23-MAY-13 11:00:00 (CST-6)
Location: MUSTANG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flooding reported near SW 44th St. and Morgan Rd between 44th and 59th St. No damage reported.

Flash Flood in CANADIAN, OKLAHOMA
From 23-MAY-13 08:00:00 to 23-MAY-13 08:00:00 (CST-6)
Location: YUKON
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flooding along Sara Rd between SW 15th St. and 29th St. Several cars stranded or inundated. No injuries reported. Damages estimated.

Flash Flood in CLEVELAND, OKLAHOMA
From 23-MAY-13 09:00:00 to 23-MAY-13 12:00:00 (CST-6)
Location: NORMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Water over road at S Highway 9 and 36th Ave SE in Norman. No damage reported.

Flash Flood in CLEVELAND, OKLAHOMA
From 23-MAY-13 09:00:00 to 23-MAY-13 09:00:00 (CST-6)
Location: (OUN)NORMAN WESTHEIMER ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flash flooding along 12th St between Franklin and Tecumseh Rd. No damage reported.

Flash Flood in CLEVELAND, OKLAHOMA
From 23-MAY-13 09:00:00 to 23-MAY-13 12:00:00 (CST-6)
Location: MOORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Water over roadway at Indian Hills and 24th Ave NW north of Norman. No damage reported.

Hail in CANADIAN, OKLAHOMA
From 23-MAY-13 05:30:00 to 23-MAY-13 05:30:00 (CST-6)
Location: YUKON
Magnitude: 1.00 
Reported by: Public

Hail in CLEVELAND, OKLAHOMA
From 23-MAY-13 05:42:00 to 23-MAY-13 05:42:00 (CST-6)
Location: MOORE
Magnitude: 1.75 
Reported by: Public

At 104th SW and Council.

Thunderstorm Wind in MCCLAIN, OKLAHOMA
From 23-MAY-13 06:02:00 to 23-MAY-13 06:02:00 (CST-6)
Location: NEWCASTLE
Magnitude: 56.00 EG
Reported by: NWS Employee

Estimated 65 mph.

Hail in GARVIN, OKLAHOMA
From 23-MAY-13 06:49:00 to 23-MAY-13 06:49:00 (CST-6)
Location: PAULS VALLEY
Magnitude: 1.00 
Reported by: Trained Spotter

Dime to quarter size hail reported.

Hail in GARVIN, OKLAHOMA
From 23-MAY-13 06:53:00 to 23-MAY-13 06:53:00 (CST-6)
Location: PAULS VALLEY
Magnitude: 1.75 
Reported by: Public

Observed 1 mile east of I-35. Also 1.5 hail reported two minutes later.

Hail in MURRAY, OKLAHOMA
From 23-MAY-13 07:50:00 to 23-MAY-13 07:50:00 (CST-6)
Location: SULPHUR
Magnitude: 1.00 
Reported by: Public

Hail in MURRAY, OKLAHOMA
From 23-MAY-13 07:35:00 to 23-MAY-13 07:35:00 (CST-6)
Location: DAVIS
Magnitude: 2.50 
Reported by: Emergency Manager

Flash Flood in OKLAHOMA, OKLAHOMA
From 23-MAY-13 05:55:00 to 23-MAY-13 08:55:00 (CST-6)
Location: WHEATLAND
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

Reports of water over roadways at several locations including S Rockwell and SW 89th, SW 59th and S County Line Rd, and S Portland and SW 89th. Sinkhole opened at intersection of SW 74th and S Rockwell Ave, making the road impassable.