Thunderstorms developed during heating of the afternoon over parts of Southern Oklahoma. Temperatures reached into the 90s, making temperature-dew point spreads on the order of 30-40 degrees. Instability was minimal, but a few thunderstorms were able to produce very strong winds, causing some minor damage in Stephens county.
At the same time, numerous thunderstorms developed ahead of a cold front that moved into northwest Oklahoma during the afternoon hours of the 26th. These thunderstorms developed through the evening hours, with the aid of convergence along the front, and lift associated with an upper level storm system moving through the central plains. The thunderstorms formed into several complexes due to the presence of numerous outflow boundaries. Surface moisture and instability along and just behind the front were sufficient for the thunderstorms to become severe. The thunderstorms moved off to the east with strong winds and large hail reported. A landspout developed over southwest Kingfisher county, remaining nearly stationary for over 10 minutes. No damage was reported with the landspout.

Hail in DEWEY, OKLAHOMA
From 26-AUG-09 15:55:00 to 26-AUG-09 15:55:00 (CST-6)
Location: SEILING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Quarter to golf ball-size hail was reported.

Hail in DEWEY, OKLAHOMA
From 26-AUG-09 16:00:00 to 26-AUG-09 16:00:00 (CST-6)
Location: SEILING
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The hail was reported by KWTV-9.

Hail in WASHITA, OKLAHOMA
From 26-AUG-09 18:00:00 to 26-AUG-09 18:00:00 (CST-6)
Location: CORDELL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in LOGAN, OKLAHOMA
From 26-AUG-09 20:00:00 to 26-AUG-09 20:00:00 (CST-6)
Location: MULHALL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

No damage was reported with the wind gust.

Thunderstorm Wind in GRADY, OKLAHOMA
From 26-AUG-09 20:05:00 to 26-AUG-09 20:05:00 (CST-6)
Location: MINCO
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CADDO, OKLAHOMA
From 26-AUG-09 22:30:00 to 26-AUG-09 22:35:00 (CST-6)
Location: FT COBB
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Another wind gust of 61 mph was measured at 2330 CDT.

Thunderstorm Wind in GRADY, OKLAHOMA
From 26-AUG-09 23:15:00 to 26-AUG-09 23:15:00 (CST-6)
Location: NORGE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Tornado in KINGFISHER, OKLAHOMA
From 26-AUG-09 17:10:00 to 26-AUG-09 17:21:00 (CST-6)
Location: OMEGA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A landspout tornado was observed in southwestern Kingfisher County.  This landspout persisted for approximately 12 minutes and moved very slowly.

Thunderstorm Wind in CANADIAN, OKLAHOMA
From 26-AUG-09 17:30:00 to 26-AUG-09 17:30:00 (CST-6)
Location: OKARCHE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

No damage was reported with the wind gust.

Thunderstorm Wind in GRANT, OKLAHOMA
From 26-AUG-09 19:00:00 to 26-AUG-09 19:00:00 (CST-6)
Location: MEDFORD
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCCLAIN, OKLAHOMA
From 26-AUG-09 21:00:00 to 26-AUG-09 21:00:00 (CST-6)
Location: NEWCASTLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

No damage was reported with the wind gust.

Hail in CADDO, OKLAHOMA
From 26-AUG-09 22:00:00 to 26-AUG-09 22:00:00 (CST-6)
Location: CARNEGIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 26-AUG-09 21:25:00 to 26-AUG-09 21:25:00 (CST-6)
Location: NORMAN
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ALFALFA, OKLAHOMA
From 26-AUG-09 17:50:00 to 26-AUG-09 17:50:00 (CST-6)
Location: GREAT SALT PLAINS LAKE DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARFIELD, OKLAHOMA
From 26-AUG-09 18:11:00 to 26-AUG-09 18:11:00 (CST-6)
Location: NORTH ENID
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The hail was reported one and a half miles west of Midway.

Thunderstorm Wind in BECKHAM, OKLAHOMA
From 26-AUG-09 16:47:00 to 26-AUG-09 16:49:00 (CST-6)
Location: SAYRE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Shingles were blown off of a hotel, located of exit 20 on Interstate 40. Monetary damages were estimated.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 26-AUG-09 21:10:00 to 26-AUG-09 21:10:00 (CST-6)
Location: MOORE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

No damage was reported with the wind gust.

Hail in GARFIELD, OKLAHOMA
From 26-AUG-09 19:26:00 to 26-AUG-09 19:26:00 (CST-6)
Location: DRUMMOND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in KINGFISHER, OKLAHOMA
From 26-AUG-09 18:20:00 to 26-AUG-09 18:22:00 (CST-6)
Location: KINGFISHER
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A roof was blown off of a house. Monetary damages were estimated.

Thunderstorm Wind in POTTAWATOMIE, OKLAHOMA
From 26-AUG-09 22:20:00 to 26-AUG-09 22:22:00 (CST-6)
Location: MACOMB
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Post Office

Up to 18-inch tree limbs were blown down. Monetary damages were estimated.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 26-AUG-09 16:10:00 to 26-AUG-09 16:12:00 (CST-6)
Location: MARLOW
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A large tree was blown down in the Clear Creak Area. Monetary damages were estimated.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 26-AUG-09 16:10:00 to 26-AUG-09 16:12:00 (CST-6)
Location: MARLOW
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several large tree branches and power lines were downed throughout the time. Monetary damages were estimated.

Thunderstorm Wind in MCCLAIN, OKLAHOMA
From 26-AUG-09 21:06:00 to 26-AUG-09 21:06:00 (CST-6)
Location: NEWCASTLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The wind gust was reported near Highway 9 and May Avenue.

Hail in CADDO, OKLAHOMA
From 26-AUG-09 22:50:00 to 26-AUG-09 22:50:00 (CST-6)
Location: WASHITA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The hail was reported by the Caddo Nation emergency manager at Highway 9 and county road 2620.