A potent upper level low pressure system combined with an unseasonably moist and unstable airmass across Oklahoma to promote severe thunderstorms. Storms initially developed over western Oklahoma and migrated southward overnight, with sporadic damaging wind and large hail reports from the Kansas Oklahoma border southward to the Red River. Persistent heavy rainfall also led to flash flooding in some areas.

Hail in TILLMAN, OKLAHOMA
From 15-AUG-13 14:30:00 to 15-AUG-13 14:30:00 (CST-6)
Location: GRANDFIELD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

No damage reported.

Hail in COTTON, OKLAHOMA
From 15-AUG-13 14:40:00 to 15-AUG-13 14:40:00 (CST-6)
Location: DEVOL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Reported by rural mail carrier. No damage reported.

Hail in CADDO, OKLAHOMA
From 15-AUG-13 15:16:00 to 15-AUG-13 15:16:00 (CST-6)
Location: COGAR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CADDO, OKLAHOMA
From 15-AUG-13 15:52:00 to 15-AUG-13 15:52:00 (CST-6)
Location: CYRIL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

No damage was reported.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 15-AUG-13 16:00:00 to 15-AUG-13 16:00:00 (CST-6)
Location: STERLING
Magnitude: 61.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several 6 to 8 inch diameter tree limbs down.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 15-AUG-13 16:25:00 to 15-AUG-13 16:25:00 (CST-6)
Location: STERLING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Four and five inch diameter tree limbs down at Sterling High School.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 15-AUG-13 16:25:00 to 15-AUG-13 16:25:00 (CST-6)
Location: FLETCHER
Magnitude: 70.00 EG
Property damage: 55.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Commercial building roof collapsed. Several carports blown away with 3 utility poles snapped.

Hail in WOODS, OKLAHOMA
From 15-AUG-13 21:55:00 to 15-AUG-13 21:55:00 (CST-6)
Location: ALVA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in TILLMAN, OKLAHOMA
From 15-AUG-13 14:25:00 to 15-AUG-13 14:25:00 (CST-6)
Location: GRANDFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 15-AUG-13 16:15:00 to 15-AUG-13 16:15:00 (CST-6)
Location: STERLING
Magnitude: 61.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Four power poles snapped at base.

Hail in WOODS, OKLAHOMA
From 15-AUG-13 22:45:00 to 15-AUG-13 22:45:00 (CST-6)
Location: WAYNOKA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ROGER MILLS, OKLAHOMA
From 15-AUG-13 23:10:00 to 15-AUG-13 23:10:00 (CST-6)
Location: DURHAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROGER MILLS, OKLAHOMA
From 16-AUG-13 00:00:00 to 16-AUG-13 00:00:00 (CST-6)
Location: REYDON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

No damage reported.

Thunderstorm Wind in ROGER MILLS, OKLAHOMA
From 16-AUG-13 00:00:00 to 16-AUG-13 00:00:00 (CST-6)
Location: REYDON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few larger trees down.

Hail in ROGER MILLS, OKLAHOMA
From 16-AUG-13 00:20:00 to 16-AUG-13 00:20:00 (CST-6)
Location: SWEETWATER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BECKHAM, OKLAHOMA
From 16-AUG-13 00:25:00 to 16-AUG-13 00:25:00 (CST-6)
Location: SWEETWATER
Magnitude: 2.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

No damage reported.

Thunderstorm Wind in HARMON, OKLAHOMA
From 16-AUG-13 02:35:00 to 16-AUG-13 02:35:00 (CST-6)
Location: HOLLIS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

No damage reported.