A warm front moved slowly north through Oklahoma, settling near the Oklahoma and Kansas border by mid afternoon. Scattered thunderstorms developed over western and northern Oklahoma, with another area of thunderstorms developing near the Red River. The thunderstorms produced large hail and heavy rain as they moved east and northeast. One thunderstorm, however, remained discrete and moved east and then east-southeast over north-central Oklahoma. Backed surface winds near the warm front helped maximize low-level wind shear, and three brief tornadoes developed over open country in Grant county. The storms over southwest Oklahoma weakened with the loss of daytime heating, but the northern Oklahoma storms merged into a complex. This complex continued well into the evening producing heavy rain.

Hail in WOODWARD, OKLAHOMA
From 17-SEP-11 15:40:00 to 17-SEP-11 15:40:00 (CST-6)
Location: MOORELAND ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Quarter- to Golf Ball-size hail was reported at Alabaster Caverns State Park.

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 17-SEP-11 17:15:00 to 17-SEP-11 17:15:00 (CST-6)
Location: GRANDFIELD
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in COMANCHE, OKLAHOMA
From 17-SEP-11 17:14:00 to 17-SEP-11 17:21:00 (CST-6)
Location: MEDICINE PARK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in NOBLE, OKLAHOMA
From 17-SEP-11 18:39:00 to 17-SEP-11 18:39:00 (CST-6)
Location: BILLINGS
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ALFALFA, OKLAHOMA
From 17-SEP-11 17:10:00 to 17-SEP-11 17:10:00 (CST-6)
Location: CARMEN
Magnitude: 56.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Six power poles were snapped. Monetary damages were estimated.

Tornado in GRANT, OKLAHOMA
From 17-SEP-11 16:46:00 to 17-SEP-11 16:49:00 (CST-6)
Location: WAKITA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Numerous storm chasers reported a tornado south of Wakita that persisted for a few minutes as it moved southeast. No damage was reported.

Tornado in GRANT, OKLAHOMA
From 17-SEP-11 16:49:00 to 17-SEP-11 16:49:00 (CST-6)
Location: WAKITA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A second tornado was observed by numerous storm chasers to the northeast of the larger tornado that was occurring south of Wakita. This tornado was a narrow rope tornado that became very elongated and tilted from the cloud base. No damage was reported with this tornado.

Tornado in GRANT, OKLAHOMA
From 17-SEP-11 16:55:00 to 17-SEP-11 16:55:00 (CST-6)
Location: WAKITA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A third brief tornado was observed by a media storm chaser. Again, no damage was reported with this tornado.

Thunderstorm Wind in KAY, OKLAHOMA
From 17-SEP-11 18:20:00 to 17-SEP-11 18:20:00 (CST-6)
Location: KILDARE
Magnitude: 61.00 EG
Reported by: Emergency Manager

Several trees and a barn were damaged. Monetary damage estimates were not available.

Hail in TILLMAN, OKLAHOMA
From 17-SEP-11 17:15:00 to 17-SEP-11 17:15:00 (CST-6)
Location: GRANDFIELD
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 17-SEP-11 17:15:00 to 17-SEP-11 17:15:00 (CST-6)
Location: GRANDFIELD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

In addition to the severe winds, hail up to two inches in diameter was reported.

Thunderstorm Wind in KAY, OKLAHOMA
From 17-SEP-11 18:10:00 to 17-SEP-11 18:10:00 (CST-6)
Location: BLACKWELL
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in KAY, OKLAHOMA
From 17-SEP-11 18:15:00 to 17-SEP-11 18:15:00 (CST-6)
Location: (PNC)PONCA CITY ARPT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in MAJOR, OKLAHOMA
From 17-SEP-11 18:25:00 to 17-SEP-11 18:25:00 (CST-6)
Location: FAIRVIEW
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GARFIELD, OKLAHOMA
From 17-SEP-11 19:39:00 to 17-SEP-11 19:39:00 (CST-6)
Location: DRUMMOND
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ALFALFA, OKLAHOMA
From 17-SEP-11 15:35:00 to 17-SEP-11 15:35:00 (CST-6)
Location: AMORITA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WOODWARD, OKLAHOMA
From 17-SEP-11 15:50:00 to 17-SEP-11 15:50:00 (CST-6)
Location: WOODWARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BECKHAM, OKLAHOMA
From 17-SEP-11 16:02:00 to 17-SEP-11 16:02:00 (CST-6)
Location: RETROP
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 17-SEP-11 17:05:00 to 17-SEP-11 17:05:00 (CST-6)
Location: GRANDFIELD
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in GARFIELD, OKLAHOMA
From 17-SEP-11 20:13:00 to 17-SEP-11 20:13:00 (CST-6)
Location: ENID
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail report was relayed by personnel at Vance Air Force Base.

Hail in HARPER, OKLAHOMA
From 17-SEP-11 15:00:00 to 17-SEP-11 15:00:00 (CST-6)
Location: SELMAN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARPER, OKLAHOMA
From 17-SEP-11 15:00:00 to 17-SEP-11 15:00:00 (CST-6)
Location: SELMAN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public