The afternoon of May 22nd was characterized by a sharp dry line which mixed to just east of the I-35 corridor by late afternoon. A cold front surged southward into central Oklahoma during the late afternoon. The dew point temperatures were in the mid 60s and the temperatures were in the low to mid 90s ahead of the two boundaries. This coupled with a stout capping inversion for much of the day allowed for extreme instability to build across much of southern and eastern Oklahoma, and south into northern Texas. Once storms developed in the late afternoon, many of them quickly became severe. Steep lapse rates throughout the atmosphere lead to the threat for very large hail with an attendant threat of damaging winds. The hail sizes reached over four inches near Lone Grove, with golf-ball to baseball size over several other locations.

Hail in MURRAY, OKLAHOMA
From 22-MAY-11 16:47:00 to 22-MAY-11 16:47:00 (CST-6)
Location: SULPHUR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PONTOTOC, OKLAHOMA
From 22-MAY-11 17:21:00 to 22-MAY-11 17:21:00 (CST-6)
Location: ADA
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in PONTOTOC, OKLAHOMA
From 22-MAY-11 17:22:00 to 22-MAY-11 17:22:00 (CST-6)
Location: ADA
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in CARTER, OKLAHOMA
From 22-MAY-11 18:28:00 to 22-MAY-11 18:28:00 (CST-6)
Location: RATLIFF CITY
Magnitude: 63.00 MG
Reported by: Law Enforcement

Occurred at the intersection of Highway 76 and Ranch Road.

Hail in JEFFERSON, OKLAHOMA
From 22-MAY-11 17:52:00 to 22-MAY-11 17:52:00 (CST-6)
Location: RYAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in JEFFERSON, OKLAHOMA
From 22-MAY-11 17:55:00 to 22-MAY-11 17:55:00 (CST-6)
Location: RYAN
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PONTOTOC, OKLAHOMA
From 22-MAY-11 18:03:00 to 22-MAY-11 18:03:00 (CST-6)
Location: ADA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The hail was reported at Valley View Regional Hospital.

Hail in CARTER, OKLAHOMA
From 22-MAY-11 16:00:00 to 22-MAY-11 16:00:00 (CST-6)
Location: WILSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LOVE, OKLAHOMA
From 22-MAY-11 16:13:00 to 22-MAY-11 16:13:00 (CST-6)
Location: MARIETTA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CARTER, OKLAHOMA
From 22-MAY-11 16:13:00 to 22-MAY-11 16:17:00 (CST-6)
Location: LONE GROVE
Magnitude: 4.50 
Reported by: Fire Department/Rescue

Up to 4.50 inch diameter hail was reported in and around Lone Grove. The hail broke several windows out of home and automobiles. Monetary damage estimates were not available.

Thunderstorm Wind in JEFFERSON, OKLAHOMA
From 22-MAY-11 18:15:00 to 22-MAY-11 18:15:00 (CST-6)
Location: RINGLING
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 57 mph was also measured at 1910 CDT.

Hail in MURRAY, OKLAHOMA
From 22-MAY-11 18:40:00 to 22-MAY-11 18:40:00 (CST-6)
Location: DAVIS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail was reported on Exit 55 of Interstate 35.

Hail in PONTOTOC, OKLAHOMA
From 22-MAY-11 19:08:00 to 22-MAY-11 19:08:00 (CST-6)
Location: VANOSS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CARTER, OKLAHOMA
From 22-MAY-11 16:18:00 to 22-MAY-11 16:18:00 (CST-6)
Location: ARDMORE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CARTER, OKLAHOMA
From 22-MAY-11 16:29:00 to 22-MAY-11 16:29:00 (CST-6)
Location: GENE AUTRY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in CARTER, OKLAHOMA
From 22-MAY-11 18:28:00 to 22-MAY-11 18:28:00 (CST-6)
Location: RATLIFF CITY
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The wind gust was measured on Highway 76 near Ranch Road.

Hail in CARTER, OKLAHOMA
From 22-MAY-11 16:23:00 to 22-MAY-11 16:23:00 (CST-6)
Location: SPRINGER
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PONTOTOC, OKLAHOMA
From 22-MAY-11 17:40:00 to 22-MAY-11 17:40:00 (CST-6)
Location: ALLEN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in CARTER, OKLAHOMA
From 22-MAY-11 16:29:00 to 22-MAY-11 16:29:00 (CST-6)
Location: SPRINGER
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MURRAY, OKLAHOMA
From 22-MAY-11 16:32:00 to 22-MAY-11 16:32:00 (CST-6)
Location: DAVIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MURRAY, OKLAHOMA
From 22-MAY-11 16:38:00 to 22-MAY-11 16:38:00 (CST-6)
Location: DOUGHERTY
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in JEFFERSON, OKLAHOMA
From 22-MAY-11 18:07:00 to 22-MAY-11 18:07:00 (CST-6)
Location: WAURIKA
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A small barn was blown down. Monetary damages were estimated.