A classic late Spring severe weather setup unfolded over the southern Plains. Rich low-level moisture and very warm temperatures contributed to high instability, while an incoming shortwave trough yielded deep-layer shear sufficient for supercells during the afternoon. Owing to the large spread between surface temperatures and dew points over most of Oklahoma, tornadoes did not occur, but significant hail was common with the storms early in their life cycles over far western Oklahoma. Later in the evening, storm outflows consolidated in some cases to produce more linear convection, transitioning the reports toward severe wind gusts farther east.

Hail in BECKHAM, OKLAHOMA
From 18-MAY-13 17:00:00 to 18-MAY-13 17:00:00 (CST-6)
Location: ELK CITY
Magnitude: 2.50 
Reported by: Public

Public reported golfball to tennis ball size hail.

Thunderstorm Wind in BLAINE, OKLAHOMA
From 18-MAY-13 18:00:00 to 18-MAY-13 18:00:00 (CST-6)
Location: EAGLE CITY
Magnitude: 51.00 MG
Reported by: Mesonet

Mesonet site at Watonga measured a wind gust to 59 mph.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 18-MAY-13 19:22:00 to 18-MAY-13 19:22:00 (CST-6)
Location: (END)VANCE AFB ENID
Magnitude: 56.00 MG
Reported by: AWOS

Thunderstorm Wind in DEWEY, OKLAHOMA
From 18-MAY-13 22:50:00 to 18-MAY-13 22:50:00 (CST-6)
Location: CAMARGO
Magnitude: 52.00 MG
Reported by: Mesonet

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 15:33:00 to 18-MAY-13 15:33:00 (CST-6)
Location: ELDORADO
Magnitude: 1.75 
Reported by: Public

Hail in WASHITA, OKLAHOMA
From 18-MAY-13 16:15:00 to 18-MAY-13 16:15:00 (CST-6)
Location: DILL CITY
Magnitude: 1.75 
Reported by: Amateur Radio

Hail in HARMON, OKLAHOMA
From 18-MAY-13 15:45:00 to 18-MAY-13 15:45:00 (CST-6)
Location: GOULD
Magnitude: 2.50 
Reported by: Public

Relayed by local media (Kswo).

Hail in HARMON, OKLAHOMA
From 18-MAY-13 16:27:00 to 18-MAY-13 16:27:00 (CST-6)
Location: MC QUEEN
Magnitude: 1.25 
Reported by: Law Enforcement

Thunderstorm Wind in CUSTER, OKLAHOMA
From 18-MAY-13 17:30:00 to 18-MAY-13 17:30:00 (CST-6)
Location: WEATHERFORD
Magnitude: 54.00 MG
Reported by: Mesonet

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 18:14:00 to 18-MAY-13 18:14:00 (CST-6)
Location: BLAIR
Magnitude: 2.00 
Reported by: Emergency Manager

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 19:45:00 to 18-MAY-13 19:45:00 (CST-6)
Location: ALTUS
Magnitude: 1.75 
Reported by: Public

Thunderstorm Wind in MAJOR, OKLAHOMA
From 18-MAY-13 19:40:00 to 18-MAY-13 19:40:00 (CST-6)
Location: MENO
Magnitude: 58.00 MG
Reported by: Mesonet

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 18-MAY-13 19:50:00 to 18-MAY-13 19:50:00 (CST-6)
Location: BRECKINRIDGE
Magnitude: 55.00 MG
Reported by: Mesonet

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 16:11:00 to 18-MAY-13 16:11:00 (CST-6)
Location: WARREN
Magnitude: 2.50 
Reported by: Fire Department/Rescue

Golfball to tennis ball size hail was reported.

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 15:51:00 to 18-MAY-13 15:51:00 (CST-6)
Location: FRIENDSHIP
Magnitude: 2.75 
Reported by: Emergency Manager

Relayed by EM. Also reported 1.25 hail five minutes prior.

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 15:51:00 to 18-MAY-13 15:51:00 (CST-6)
Location: WARREN
Magnitude: 2.50 
Reported by: Fire Department/Rescue

Continued for 20 minutes.

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 16:34:00 to 18-MAY-13 16:34:00 (CST-6)
Location: DUKE
Magnitude: 2.50 
Reported by: Law Enforcement

On Highway 62 at the Jackson-Harmon Co. line.

Hail in CUSTER, OKLAHOMA
From 18-MAY-13 16:44:00 to 18-MAY-13 16:44:00 (CST-6)
Location: ARAPAHO
Magnitude: 1.25 
Reported by: Public

Hail in KIOWA, OKLAHOMA
From 18-MAY-13 18:23:00 to 18-MAY-13 18:23:00 (CST-6)
Location: LONE WOLF
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-13 19:00:00 to 18-MAY-13 19:00:00 (CST-6)
Location: MT SCOTT
Magnitude: 52.00 MG
Reported by: Mesonet

Thunderstorm Wind in CUSTER, OKLAHOMA
From 18-MAY-13 19:10:00 to 18-MAY-13 19:10:00 (CST-6)
Location: WEATHERFORD
Magnitude: 52.00 MG
Reported by: Mesonet

Thunderstorm Wind in CANADIAN, OKLAHOMA
From 18-MAY-13 19:15:00 to 18-MAY-13 19:15:00 (CST-6)
Location: CONCHO
Magnitude: 52.00 MG
Reported by: Mesonet

Thunderstorm Wind in GRADY, OKLAHOMA
From 18-MAY-13 20:05:00 to 18-MAY-13 20:05:00 (CST-6)
Location: MINCO
Magnitude: 56.00 EG
Property damage: 1.00K
Reported by: Other Federal Agency

One foot diameter tree was downed.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 18-MAY-13 20:08:00 to 18-MAY-13 20:08:00 (CST-6)
Location: ENID
Magnitude: 56.00 EG
Property damage: 40.00K
Reported by: Emergency Manager

Many trees and power lines downed, and a police officer was injured by debris.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 18-MAY-13 20:10:00 to 18-MAY-13 20:10:00 (CST-6)
Location: BRECKINRIDGE
Magnitude: 54.00 MG
Reported by: Mesonet

Mesonet measured wind gust to 62 mph. Also measured 58 mph five minutes earlier.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 18-MAY-13 20:40:00 to 18-MAY-13 20:40:00 (CST-6)
Location: OKLAHOMA CITY
Magnitude: 56.00 EG
Property damage: 30.00K
Reported by: Emergency Manager

Many power lines were downed in the area around 150th and Penn.

Thunderstorm Wind in GARFIELD, OKLAHOMA
From 18-MAY-13 19:50:00 to 18-MAY-13 19:50:00 (CST-6)
Location: (WDG) WOODRING ARPT
Magnitude: 54.00 MG
Reported by: AWOS

Measured at Woodwring Airport.

Hail in GARFIELD, OKLAHOMA
From 18-MAY-13 20:00:00 to 18-MAY-13 20:00:00 (CST-6)
Location: (END)VANCE AFB ENID
Magnitude: 1.90 
Reported by: Trained Spotter

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 19:51:00 to 18-MAY-13 19:51:00 (CST-6)
Location: ALTUS
Magnitude: 1.75 
Reported by: Amateur Radio

At Park Lane and Heritage areas.

Hail in JACKSON, OKLAHOMA
From 18-MAY-13 20:00:00 to 18-MAY-13 20:00:00 (CST-6)
Location: (LTS)ALTUS AFB
Magnitude: 1.90 
Reported by: Trained Spotter

Hail in COMANCHE, OKLAHOMA
From 18-MAY-13 20:41:00 to 18-MAY-13 20:41:00 (CST-6)
Location: ELGIN
Magnitude: 1.75 
Reported by: Law Enforcement

Thunderstorm Wind in MAJOR, OKLAHOMA
From 18-MAY-13 20:50:00 to 18-MAY-13 20:50:00 (CST-6)
Location: MENO
Magnitude: 61.00 MG
Reported by: Mesonet

Mesonet site at Lahoma measured a gust to 70 mph. Also measured gusts of 57-58 mph at several times over the preceding hour.

Hail in COMANCHE, OKLAHOMA
From 18-MAY-13 22:13:00 to 18-MAY-13 22:13:00 (CST-6)
Location: LAWTON
Magnitude: 1.25 
Reported by: Public

At I-44 and Highway 36.

Hail in COMANCHE, OKLAHOMA
From 18-MAY-13 22:27:00 to 18-MAY-13 22:27:00 (CST-6)
Location: LAWTON
Magnitude: 1.00 
Reported by: Broadcast Media