Thunderstorms developed ahead of a cold front and near an outflow boundary that was left over from thunderstorms that occurred earlier in the day. Instability and wind shear were sufficient near these boundaries for the thunderstorms to become severe. The thunderstorms developed into several small complexes, with strong winds and heavy rains the main threats. Some damage was reported with the high winds, especially in the Payne and Harper counties.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 10-AUG-09 16:10:00 to 10-AUG-09 16:10:00 (CST-6)
Location: (END)VANCE AFB ENID
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in LOGAN, OKLAHOMA
From 10-AUG-09 16:37:00 to 10-AUG-09 16:37:00 (CST-6)
Location: MULHALL
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The observer also measured 1.24 inches of rainfall with the thunderstorm.

Thunderstorm Wind in PAYNE, OKLAHOMA
From 10-AUG-09 16:40:00 to 10-AUG-09 16:40:00 (CST-6)
Location: (SWO)STILLWATER AIRPORT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in WOODWARD, OKLAHOMA
From 10-AUG-09 17:45:00 to 10-AUG-09 17:45:00 (CST-6)
Location: MOORELAND ARPT
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WOODWARD, OKLAHOMA
From 10-AUG-09 17:55:00 to 10-AUG-09 17:55:00 (CST-6)
Location: MOORELAND ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MAJOR, OKLAHOMA
From 10-AUG-09 19:05:00 to 10-AUG-09 19:05:00 (CST-6)
Location: MENO
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ALFALFA, OKLAHOMA
From 10-AUG-09 13:10:00 to 10-AUG-09 13:10:00 (CST-6)
Location: BURLINGTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel-size hail was also reported at this location.

Hail in ALFALFA, OKLAHOMA
From 10-AUG-09 13:10:00 to 10-AUG-09 13:10:00 (CST-6)
Location: BURLINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Winds of 60 mph were also estimated at this location.

Hail in ALFALFA, OKLAHOMA
From 10-AUG-09 13:49:00 to 10-AUG-09 13:49:00 (CST-6)
Location: CHEROKEE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in ALFALFA, OKLAHOMA
From 10-AUG-09 14:05:00 to 10-AUG-09 14:05:00 (CST-6)
Location: CHEROKEE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 10-AUG-09 15:05:00 to 10-AUG-09 15:05:00 (CST-6)
Location: (END)VANCE AFB ENID
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ALFALFA, OKLAHOMA
From 10-AUG-09 13:50:00 to 10-AUG-09 13:50:00 (CST-6)
Location: CHEROKEE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PAYNE, OKLAHOMA
From 10-AUG-09 16:40:00 to 10-AUG-09 16:40:00 (CST-6)
Location: STILLWATER
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several 10-15 inch diameter tree limbs were downed, some of them falling on top of power lines. At least 6,200 people were without power for around an hour. Monetary damages were estimated.

Thunderstorm Wind in PAYNE, OKLAHOMA
From 10-AUG-09 16:40:00 to 10-AUG-09 16:42:00 (CST-6)
Location: STILLWATER
Magnitude: 61.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A billboard and power pole were blown to the ground. Monetary damages were estimated.

Thunderstorm Wind in HARPER, OKLAHOMA
From 10-AUG-09 17:15:00 to 10-AUG-09 17:15:00 (CST-6)
Location: BUFFALO
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Shingles were blown of the roof of the Coop observer's house. Monetary damages were estimated.