A cold front entered far northwest Oklahoma during the early morning hours of the 23rd before stalling. Moist air from the Gulf of Mexico moved north into Oklahoma ahead of the front. Also, an upper level storm system approached the southern plains from the Four Corners area of the United States. The stalled cold front began lifting north as a warm front through the eastern half of the Oklahoma panhandle and the northeast Texas panhandle. Thunderstorms developed along this retreating front, with several quickly becoming supercellular. A couple of supercells moved through Harper county, with large hail the main threat. Hail up to the size of softballs was reported with the most intense storms, with smaller sizes reported elsewhere. Another cold front moved out of western Kansas and moved southeast into Oklahoma. A line of strong to severe thunderstorms developed along this boundary, affecting mainly northwest Oklahoma. The main hazards with this line were strong winds and large hail. The line continued southeast into the morning hours, with  thunderstorms briefly becoming severe through mid morning of the 24th.

Hail in ELLIS, OKLAHOMA
From 23-MAY-07 22:50:00 to 23-MAY-07 22:50:00 (CST-6)
Location: GAGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in HARPER, OKLAHOMA
From 23-MAY-07 15:48:00 to 23-MAY-07 15:48:00 (CST-6)
Location: BUFFALO
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Reported at the intersection of highways 64 & 46.

Thunderstorm Wind in LOGAN, OKLAHOMA
From 24-MAY-07 06:05:00 to 24-MAY-07 06:05:00 (CST-6)
Location: GUTHRIE
Magnitude: 52.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Public

At approximately 1.5 miles north of the intersection of Waterloo and Douglas, two garage doors were dented in and a large section of a cottonwood tree was ripped off. Monetary damages were estimated.

Hail in HARPER, OKLAHOMA
From 23-MAY-07 15:12:00 to 23-MAY-07 15:12:00 (CST-6)
Location: LAVERNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Reported at Log Cabin Corner.

Hail in ROGER MILLS, OKLAHOMA
From 24-MAY-07 01:09:00 to 24-MAY-07 01:09:00 (CST-6)
Location: REYDON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in TILLMAN, OKLAHOMA
From 24-MAY-07 07:18:00 to 24-MAY-07 07:18:00 (CST-6)
Location: GRANDFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in ALFALFA, OKLAHOMA
From 24-MAY-07 02:00:00 to 24-MAY-07 02:00:00 (CST-6)
Location: CHEROKEE
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in HARPER, OKLAHOMA
From 23-MAY-07 21:30:00 to 23-MAY-07 21:30:00 (CST-6)
Location: LAVERNE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Reported at HWY 283.

Hail in WOODWARD, OKLAHOMA
From 24-MAY-07 00:10:00 to 24-MAY-07 00:10:00 (CST-6)
Location: TANGIER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARPER, OKLAHOMA
From 23-MAY-07 15:25:00 to 23-MAY-07 15:25:00 (CST-6)
Location: LAVERNE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in HARPER, OKLAHOMA
From 23-MAY-07 16:00:00 to 23-MAY-07 16:00:00 (CST-6)
Location: ROSSTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARPER, OKLAHOMA
From 23-MAY-07 16:10:00 to 23-MAY-07 16:10:00 (CST-6)
Location: ROSSTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WOODWARD, OKLAHOMA
From 24-MAY-07 01:31:00 to 24-MAY-07 01:31:00 (CST-6)
Location: MOORELAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Reported along Hwy. 50.

Hail in WOODWARD, OKLAHOMA
From 24-MAY-07 00:31:00 to 24-MAY-07 00:31:00 (CST-6)
Location: WOODWARD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Reported on the northwest side of town.