High-based supercells developed over the Texas Panhandle during the afternoon, then moved northeast into western Oklahoma by early evening. Numerous reports of severe winds (some significant) and large hail were received, particularly around the Elk City-Clinton area.

Hail in GREER, OKLAHOMA
From 27-MAY-13 17:33:00 to 27-MAY-13 17:33:00 (CST-6)
Location: REED
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in WASHITA, OKLAHOMA
From 27-MAY-13 18:17:00 to 27-MAY-13 18:17:00 (CST-6)
Location: (CSM)CLINTON SHERMAN AIRPORT
Magnitude: 1.75 
Reported by: Amateur Radio

Hail in WASHITA, OKLAHOMA
From 27-MAY-13 18:22:00 to 27-MAY-13 18:22:00 (CST-6)
Location: BURNS FLAT
Magnitude: 1.75 
Reported by: Amateur Radio

Hail in WASHITA, OKLAHOMA
From 27-MAY-13 18:40:00 to 27-MAY-13 18:40:00 (CST-6)
Location: BESSIE
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in DEWEY, OKLAHOMA
From 27-MAY-13 19:12:00 to 27-MAY-13 19:12:00 (CST-6)
Location: OAKWOOD
Magnitude: 1.25 
Reported by: Fire Department/Rescue

The Oakwood Fire Dept. reported quarter to half dollar size hail.

Thunderstorm Wind in WASHITA, OKLAHOMA
From 27-MAY-13 18:15:00 to 27-MAY-13 18:15:00 (CST-6)
Location: CANUTE
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Public

A roof was blown off a barn SW of Canute.

Thunderstorm Wind in CUSTER, OKLAHOMA
From 27-MAY-13 18:36:00 to 27-MAY-13 18:36:00 (CST-6)
Location: CLINTON
Magnitude: 65.00 EG
Property damage: 40.00K
Reported by: Emergency Manager

A 60x30 ft. metal roof was blown off the Whitedog Hill Restaurant near I-40 mile marker 70. Billboard also damaged near the same location.

Thunderstorm Wind in CUSTER, OKLAHOMA
From 27-MAY-13 18:42:00 to 27-MAY-13 18:42:00 (CST-6)
Location: CLINTON
Magnitude: 56.00 EG
Property damage: 30.00K
Reported by: Emergency Manager

Five power poles down 1 mile N of I-40 exit 71.

Thunderstorm Wind in CUSTER, OKLAHOMA
From 27-MAY-13 18:42:00 to 27-MAY-13 18:42:00 (CST-6)
Location: CLINTON
Magnitude: 61.00 EG
Property damage: 2.00K
Reported by: Emergency Manager

Two trees of around 10 diameter were snapped.

Thunderstorm Wind in GREER, OKLAHOMA
From 27-MAY-13 17:30:00 to 27-MAY-13 17:30:00 (CST-6)
Location: REED
Magnitude: 61.00 EG
Reported by: Law Enforcement

Law Enforcement estimated 70 mph gusts.

Thunderstorm Wind in BECKHAM, OKLAHOMA
From 27-MAY-13 17:45:00 to 27-MAY-13 17:45:00 (CST-6)
Location: ERICK
Magnitude: 56.00 MG
Reported by: Mesonet

Mesonet site at Erick measured a gust to 65 mph. Also gusts to 60 mph and 55 mph at the next two (5-minute) observations.

Thunderstorm Wind in BECKHAM, OKLAHOMA
From 27-MAY-13 17:58:00 to 27-MAY-13 17:58:00 (CST-6)
Location: SAYRE
Magnitude: 52.00 EG
Reported by: Fire Department/Rescue

Fire Department estimated gusts to 60 mph.

Thunderstorm Wind in ROGER MILLS, OKLAHOMA
From 27-MAY-13 18:10:00 to 27-MAY-13 18:10:00 (CST-6)
Location: DEMPSEY
Magnitude: 56.00 MG
Reported by: Mesonet

Mesonet site SW of Cheyenne measured a gust to 64 mph.

Thunderstorm Wind in CUSTER, OKLAHOMA
From 27-MAY-13 18:55:00 to 27-MAY-13 18:55:00 (CST-6)
Location: CLINTON
Magnitude: 68.00 MG
Reported by: ASOS

Thunderstorm Wind in WASHITA, OKLAHOMA
From 27-MAY-13 18:18:00 to 27-MAY-13 18:18:00 (CST-6)
Location: BURNS FLAT
Magnitude: 61.00 MG
Reported by: ASOS

Measured at Clinton-Sherman Airport.

Thunderstorm Wind in CUSTER, OKLAHOMA
From 27-MAY-13 18:42:00 to 27-MAY-13 18:42:00 (CST-6)
Location: CLINTON
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Minor damage to a hangar at CLK airport.

Thunderstorm Wind in CUSTER, OKLAHOMA
From 27-MAY-13 18:18:00 to 27-MAY-13 18:18:00 (CST-6)
Location: CLINTON
Magnitude: 61.00 MG
Property damage: 15.00K
Reported by: ASOS

Measured at KCSM. Moderate damage to airport. Doors were blown off a hangar, as well as windows in the control tower. A 400 lb. round bail was also blown into the ceilometer of the ASOS.