Supercell thunderstorms developed over the southern Texas panhandle and moved into southwest Oklahoma, with large hail and four tornadoes reported by early evening. The first thunderstorms moved into western portions of north Texas and quickly strengthened to severe levels. large hail was reported as they moved northeast into southwest Oklahoma. As the storms moved into Greer county, the supercells developed strong low level rotation due to the high amounts of low-level wind shear. Four tornadoes developed over Greer and far southeast Beckham counties, but remained over open land and caused no known damage. Other storms developed during the evening hours, but the threat had transitioned to heavy rainfall, large hail, and damaging winds.

Hail in HARMON, OKLAHOMA
From 18-MAR-12 16:20:00 to 18-MAR-12 16:20:00 (CST-6)
Location: HOLLIS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in HARMON, OKLAHOMA
From 18-MAR-12 16:35:00 to 18-MAR-12 16:35:00 (CST-6)
Location: HOLLIS
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in HARMON, OKLAHOMA
From 18-MAR-12 17:08:00 to 18-MAR-12 17:08:00 (CST-6)
Location: MC KNIGHT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail was reported 3 miles ENE of Sandy, OK.

Hail in GREER, OKLAHOMA
From 18-MAR-12 17:35:00 to 18-MAR-12 17:40:00 (CST-6)
Location: REED
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 2 inch diameter hail fell for about 5 minutes.

Tornado in GREER, OKLAHOMA
From 18-MAR-12 17:50:00 to 18-MAR-12 18:04:00 (CST-6)
Location: REED
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The tornado developed just south of State Highway 9 and moved north-northeast. Although it became a well-developed tornado, it produced no known damage.

Tornado in GREER, OKLAHOMA
From 18-MAR-12 18:10:00 to 18-MAR-12 18:10:00 (CST-6)
Location: BRINKMAN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The tornado produced no known damage.

Hail in GREER, OKLAHOMA
From 18-MAR-12 18:28:00 to 18-MAR-12 18:28:00 (CST-6)
Location: WILLOW
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in ELLIS, OKLAHOMA
From 18-MAR-12 22:09:00 to 18-MAR-12 22:09:00 (CST-6)
Location: (GAG)GAGE AIRPORT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in BECKHAM, OKLAHOMA
From 19-MAR-12 02:00:00 to 19-MAR-12 02:00:00 (CST-6)
Location: ERICK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WOODWARD, OKLAHOMA
From 19-MAR-12 02:25:00 to 19-MAR-12 02:25:00 (CST-6)
Location: WOODWARD
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Tornado in BECKHAM, OKLAHOMA
From 18-MAR-12 18:37:00 to 18-MAR-12 18:42:00 (CST-6)
Location: CARTER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The tornado produced no known damage.

Hail in HARMON, OKLAHOMA
From 18-MAR-12 16:18:00 to 18-MAR-12 16:18:00 (CST-6)
Location: HOLLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail was reported along Highway 62.

Hail in HARMON, OKLAHOMA
From 18-MAR-12 16:17:00 to 18-MAR-12 16:17:00 (CST-6)
Location: HOLLIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HARMON, OKLAHOMA
From 18-MAR-12 16:15:00 to 18-MAR-12 16:15:00 (CST-6)
Location: HOLLIS
Magnitude: 1.75 
Reported by: Public

The hail damaged windshields. The report was relayed by NWS Amarillo.

Tornado in GREER, OKLAHOMA
From 18-MAR-12 18:27:00 to 18-MAR-12 18:30:00 (CST-6)
Location: WILLOW
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The tornado produced no known damage.