An unusually strong storm system traversed the southern/central Plains. A strengthening surface low pressure located over southwest Kansas, moved northeast through the afternoon, dragging a cold front into Oklahoma. Very strong winds were common over Oklahoma, with frequent gusts over 40 mph. By mid afternoon, the combination of surface temperatures warming well into the 90s, the presence of a front and dry line, and cooling aloft from the storm system eroded the stout cap that was in place. Thunderstorms developed from southwest into central and north central Oklahoma and moved east. Thunderstorms first developed along the dry line that had pushed through southwest Oklahoma. Other thunderstorms developed along the cold front over northern Oklahoma. The cold front began to overtake the dry line from north to south, and thunderstorms continued to develop down the boundary. Hail sizes reached up to golf-ball size and thunderstorm wind gusts were reported as high as 70 mph.

Hail in LINCOLN, OKLAHOMA
From 20-JUN-11 21:14:00 to 20-JUN-11 21:14:00 (CST-6)
Location: AGRA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in PAYNE, OKLAHOMA
From 20-JUN-11 21:16:00 to 20-JUN-11 21:16:00 (CST-6)
Location: CUSHING
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in BRYAN, OKLAHOMA
From 20-JUN-11 22:55:00 to 20-JUN-11 22:55:00 (CST-6)
Location: DURANT EAKER ARPT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in GRANT, OKLAHOMA
From 20-JUN-11 17:20:00 to 20-JUN-11 17:20:00 (CST-6)
Location: MEDFORD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Nickel-size hail was also reported.

Hail in GRANT, OKLAHOMA
From 20-JUN-11 16:47:00 to 20-JUN-11 16:47:00 (CST-6)
Location: MEDFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High Wind in MARSHALL, OKLAHOMA
From 20-JUN-11 21:15:00 to 20-JUN-11 21:15:00 (CST-6)
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The non-thunderstorm wind gust occurred in Oakland.

High Wind in MARSHALL, OKLAHOMA
From 20-JUN-11 21:15:00 to 20-JUN-11 21:20:00 (CST-6)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Lebanon Mesonet measured non-thunderstorm wind gusts of 61 and 64 mph.

Hail in STEPHENS, OKLAHOMA
From 20-JUN-11 17:46:00 to 20-JUN-11 17:46:00 (CST-6)
Location: COMANCHE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STEPHENS, OKLAHOMA
From 20-JUN-11 17:48:00 to 20-JUN-11 17:48:00 (CST-6)
Location: DUNCAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in COTTON, OKLAHOMA
From 20-JUN-11 17:51:00 to 20-JUN-11 17:51:00 (CST-6)
Location: WALTERS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported near the intersection of Highways 53 and 65.

Thunderstorm Wind in BRYAN, OKLAHOMA
From 20-JUN-11 23:35:00 to 20-JUN-11 23:35:00 (CST-6)
Location: BENNINGTON
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed on Perry Street. Monetary damages were estimated.

High Wind in JOHNSTON, OKLAHOMA
From 20-JUN-11 22:28:00 to 20-JUN-11 23:30:00 (CST-6)
Magnitude: 65.00 EG
Reported by: Fire Department/Rescue

Tree and power line/pole damage was reported north of Milburn by sustained strong winds for over an hour. Monetary damage estimates were not available.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 20-JUN-11 22:16:00 to 20-JUN-11 22:16:00 (CST-6)
Location: (END)VANCE AFB ENID
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in GRANT, OKLAHOMA
From 20-JUN-11 17:58:00 to 20-JUN-11 17:58:00 (CST-6)
Location: LAMONT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The hail was reported along Highway 60 in Lamont.

Hail in STEPHENS, OKLAHOMA
From 20-JUN-11 17:45:00 to 20-JUN-11 17:45:00 (CST-6)
Location: DUNCAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

The hail was reported 1.5 miles southwest of the Highways 7W and US Highway 81.

Hail in GARFIELD, OKLAHOMA
From 20-JUN-11 18:36:00 to 20-JUN-11 18:36:00 (CST-6)
Location: GARBER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The hail was reported near the intersection of Highways 74 and 412.

Hail in GARFIELD, OKLAHOMA
From 20-JUN-11 17:50:00 to 20-JUN-11 17:50:00 (CST-6)
Location: HUNTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to quarter-size hail occurred off-and-on for 20 minutes.

Hail in LOGAN, OKLAHOMA
From 20-JUN-11 20:10:00 to 20-JUN-11 20:10:00 (CST-6)
Location: GUTHRIE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in OKLAHOMA, OKLAHOMA
From 20-JUN-11 19:20:00 to 20-JUN-11 19:20:00 (CST-6)
Location: WARR ACRES
Magnitude: 1.00 
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Emergency Manager

In addition to the hail, wind speeds were estimated at 55 mph. Four car windows and six patio doors were broken by the hail. Monetary damages were estimated.

Hail in NOBLE, OKLAHOMA
From 20-JUN-11 19:50:00 to 20-JUN-11 19:50:00 (CST-6)
Location: PERRY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in LINCOLN, OKLAHOMA
From 20-JUN-11 21:07:00 to 20-JUN-11 21:07:00 (CST-6)
Location: TRYON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in LINCOLN, OKLAHOMA
From 20-JUN-11 21:07:00 to 20-JUN-11 21:07:00 (CST-6)
Location: TRYON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter-size hail was also reported with the wind gust.

Hail in OKLAHOMA, OKLAHOMA
From 20-JUN-11 19:40:00 to 20-JUN-11 19:40:00 (CST-6)
Location: (OKC)WILL ROGERS APT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported near the intersection of SW 89th Street and Pennsylvania Avenue.

Hail in OKLAHOMA, OKLAHOMA
From 20-JUN-11 19:30:00 to 20-JUN-11 19:30:00 (CST-6)
Location: THE VILLAGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported near the intersection of Western Avenue and Britton Road.

Hail in COTTON, OKLAHOMA
From 20-JUN-11 17:10:00 to 20-JUN-11 17:10:00 (CST-6)
Location: RANDLETT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in GARVIN, OKLAHOMA
From 20-JUN-11 18:55:00 to 20-JUN-11 18:55:00 (CST-6)
Location: HENNEPIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer