Isolated severe thunderstorms developed first across north central Oklahoma on the afternoon of the 17th, then by evening thunderstorms moved out of the Texas panhandle and formed into a severe line of thunderstorms and moved east overnight. Widespread damage was sustained to southern Oklahoma, south of Interstate 40.

Thunderstorm Wind in COTTON, OKLAHOMA
From 18-MAY-01 01:45:00 to 18-MAY-01 01:45:00 (CST)
Location: WALTERS
Magnitude: 51 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in LINCOLN, OKLAHOMA
From 18-MAY-01 03:13:00 to 18-MAY-01 03:13:00 (CST)
Location: MEEKER
Property damage: 20K
Reported by: GENERAL PUBLIC

A mobile home was moved approximately four feet and damaged.

Hail in BECKHAM, OKLAHOMA
From 17-MAY-01 19:43:00 to 17-MAY-01 19:43:00 (CST)
Location: SAYRE
Magnitude: 1.00 
Reported by: STORM CHASER

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 18-MAY-01 00:55:00 to 18-MAY-01 00:55:00 (CST)
Location: FREDERICK
Magnitude: 63 M
Property damage: 30K
Reported by: EMERGENCY MANAGER

A church steeple was blown off.

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 18-MAY-01 00:55:00 to 18-MAY-01 00:55:00 (CST)
Location: TIPTON
Magnitude: 51 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in CADDO, OKLAHOMA
From 18-MAY-01 01:05:00 to 18-MAY-01 01:05:00 (CST)
Location: FT COBB
Magnitude: 57 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 18-MAY-01 01:04:00 to 18-MAY-01 01:04:00 (CST)
Location: FREDERICK
Magnitude: 73 M
Property damage: 5K
Reported by: EMERGENCY MANAGER

Numerous power poles were downed.

Thunderstorm Wind in HUGHES, OKLAHOMA
From 18-MAY-01 04:10:00 to 18-MAY-01 04:10:00 (CST)
Location: CITRA
Property damage: .5K
Reported by: GENERAL PUBLIC

Trees were downed.

Hail in BECKHAM, OKLAHOMA
From 17-MAY-01 19:40:00 to 17-MAY-01 19:40:00 (CST)
Location: SAYRE
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Lightning in KAY, OKLAHOMA
From 17-MAY-01 15:00:00 to 17-MAY-01 15:00:00 (CST)
Location: PONCA CITY
Property damage: 25K
Reported by: NEWSPAPER

Two 911 dispatchers and a civilian were struck by lightning. A house was also struck by lightning causing a large fire.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-01 01:10:00 to 18-MAY-01 01:10:00 (CST)
Location: MEDICINE PARK
Magnitude: 62 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in CADDO, OKLAHOMA
From 18-MAY-01 01:10:00 to 18-MAY-01 01:10:00 (CST)
Location: FT COBB
Magnitude: 53 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 18-MAY-01 02:25:00 to 18-MAY-01 02:25:00 (CST)
Location: OKLAHOMA CITY
Magnitude: 52 E
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 18-MAY-01 02:37:00 to 18-MAY-01 02:37:00 (CST)
Location: TINKER AFB
Magnitude: 66 M
Reported by: AWOS,ASOS,MESONET,ETC

Hail in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:30:00 to 18-MAY-01 02:30:00 (CST)
Location: NORMAN
Magnitude: 0.75 
Reported by: NWS EMPLOYEE(OFF DUTY)

Lightning in PONTOTOC, OKLAHOMA
From 18-MAY-01 03:38:00 to 18-MAY-01 03:38:00 (CST)
Location: BYNG
Property damage: 15K
Reported by: NEWSPAPER

Lightning struck an oil storage tank which exploded and destroyed two additional oil storage tanks, a treater, a salt water tank, and a 250-gallon propane tank.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-01 01:15:00 to 18-MAY-01 01:15:00 (CST)
Location: MEDICINE PARK
Magnitude: 63 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in JACKSON, OKLAHOMA
From 18-MAY-01 00:42:00 to 18-MAY-01 00:42:00 (CST)
Location: DUKE
Property damage: 0K
Reported by: EMERGENCY MANAGER

An automobile was blown off the road.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-01 01:20:00 to 18-MAY-01 01:20:00 (CST)
Location: CACHE
Magnitude: 61 E
Reported by: AMATEUR RADIO

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-01 01:31:00 to 18-MAY-01 01:31:00 (CST)
Location: LAWTON
Magnitude: 52 E
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in CADDO, OKLAHOMA
From 18-MAY-01 01:38:00 to 18-MAY-01 01:38:00 (CST)
Location: APACHE
Property damage: .5K
Reported by: AMATEUR RADIO

Power lines were downed.

Thunderstorm Wind in TILLMAN, OKLAHOMA
From 18-MAY-01 01:20:00 to 18-MAY-01 01:20:00 (CST)
Location: GRANDFIELD
Magnitude: 58 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 18-MAY-01 02:30:00 to 18-MAY-01 02:30:00 (CST)
Location: VELMA
Magnitude: 55 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in COTTON, OKLAHOMA
From 18-MAY-01 01:35:00 to 18-MAY-01 01:35:00 (CST)
Location: WALTERS
Magnitude: 52 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:30:00 to 18-MAY-01 02:30:00 (CST)
Location: LEXINGTON
Property damage: 10K
Reported by: EMERGENCY MANAGER

Numerous trees and power lines were downed.

Thunderstorm Wind in CARTER, OKLAHOMA
From 18-MAY-01 02:45:00 to 18-MAY-01 02:45:00 (CST)
Location: LONE GROVE
Property damage: 4K
Reported by: EMERGENCY MANAGER

A house and barn were damaged on the west side of Lone Grove.

Hail in GRANT, OKLAHOMA
From 17-MAY-01 14:30:00 to 17-MAY-01 14:30:00 (CST)
Location: NASH
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Hail in BLAINE, OKLAHOMA
From 17-MAY-01 13:05:00 to 17-MAY-01 13:05:00 (CST)
Location: LONGDALE
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in GARFIELD, OKLAHOMA
From 17-MAY-01 14:30:00 to 17-MAY-01 14:30:00 (CST)
Location: HILLSDALE
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-01 01:25:00 to 18-MAY-01 01:25:00 (CST)
Location: MEDICINE PARK
Magnitude: 55 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 18-MAY-01 02:20:00 to 18-MAY-01 02:20:00 (CST)
Location: VELMA
Magnitude: 58 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in COTTON, OKLAHOMA
From 18-MAY-01 01:55:00 to 18-MAY-01 01:55:00 (CST)
Location: WALTERS
Magnitude: 53 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 18-MAY-01 02:08:00 to 18-MAY-01 02:08:00 (CST)
Location: OKLAHOMA CITY
Magnitude: 52 E
Reported by: EMERGENCY MANAGER

Wind was estimated near Interstate 40 and Rockwell.

Flash Flood in KINGFISHER, OKLAHOMA
From 18-MAY-01 03:00:00 to 18-MAY-01 03:00:00 (CST)
Location: HENNESSEY
Property damage: 0K
Reported by: EMERGENCY MANAGER

Street flooding was reported.

Thunderstorm Wind in OKLAHOMA, OKLAHOMA
From 18-MAY-01 02:28:00 to 18-MAY-01 02:28:00 (CST)
Location: OKLAHOMA CITY
Magnitude: 67 M
Reported by: BROADCAST MEDIA

Wind was measured at Bricktown Ballpark.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 18-MAY-01 02:08:00 to 18-MAY-01 02:08:00 (CST)
Location: DUNCAN
Property damage: .5K
Reported by: AMATEUR RADIO

Power lines were downed.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:25:00 to 18-MAY-01 02:25:00 (CST)
Location: NORMAN
Property damage: 35K
Reported by: GENERAL PUBLIC

Major roof damage was sustained to Tinker Credit Union. Rain then damaged electrical equipment inside.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:30:00 to 18-MAY-01 02:30:00 (CST)
Location: MOORE
Property damage: 2K
Reported by: UNKNOWN

Large trees were downed on the south side of Moore.

Thunderstorm Wind in JACKSON, OKLAHOMA
From 18-MAY-01 00:38:00 to 18-MAY-01 00:38:00 (CST)
Location: ALTUS AFB
Magnitude: 84 M
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in COTTON, OKLAHOMA
From 18-MAY-01 01:50:00 to 18-MAY-01 01:50:00 (CST)
Location: WALTERS
Magnitude: 50 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in COMANCHE, OKLAHOMA
From 18-MAY-01 01:52:00 to 18-MAY-01 01:52:00 (CST)
Location: LAWTON
Magnitude: 52 E
Reported by: AMATEUR RADIO

Thunderstorm Wind in JEFFERSON, OKLAHOMA
From 18-MAY-01 02:05:00 to 18-MAY-01 02:05:00 (CST)
Location: WAURIKA
Magnitude: 52 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in COTTON, OKLAHOMA
From 18-MAY-01 01:40:00 to 18-MAY-01 01:40:00 (CST)
Location: WALTERS
Magnitude: 56 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in MURRAY, OKLAHOMA
From 18-MAY-01 03:05:00 to 18-MAY-01 03:05:00 (CST)
Location: SULPHUR
Magnitude: 57 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in COAL, OKLAHOMA
From 18-MAY-01 04:05:00 to 18-MAY-01 04:05:00 (CST)
Location: LEHIGH
Magnitude: 52 E
Property damage: .01K
Reported by: EMERGENCY MANAGER

Tree limbs were downed.

Thunderstorm Wind in ATOKA, OKLAHOMA
From 18-MAY-01 04:08:00 to 18-MAY-01 04:08:00 (CST)
Location: ATOKA
Magnitude: 52 E
Property damage: .01K
Reported by: EMERGENCY MANAGER

Tree limbs were downed.

Hail in BECKHAM, OKLAHOMA
From 17-MAY-01 19:42:00 to 17-MAY-01 19:42:00 (CST)
Location: SAYRE
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Thunderstorm Wind in KINGFISHER, OKLAHOMA
From 18-MAY-01 02:08:00 to 18-MAY-01 02:08:00 (CST)
Location: HENNESSEY
Property damage: .01K
Reported by: AMATEUR RADIO

Tree limbs were downed.

Thunderstorm Wind in GRADY, OKLAHOMA
From 18-MAY-01 02:00:00 to 18-MAY-01 02:00:00 (CST)
Location: NINNEKAH
Magnitude: 57 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Flash Flood in KINGFISHER, OKLAHOMA
From 18-MAY-01 03:00:00 to 18-MAY-01 03:00:00 (CST)
Location: KINGFISHER
Property damage: 0K
Reported by: EMERGENCY MANAGER

Approximately one foot of water covered many streets.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 18-MAY-01 02:45:00 to 18-MAY-01 02:45:00 (CST)
Location: VELMA
Magnitude: 50 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in HARMON, OKLAHOMA
From 18-MAY-01 00:55:00 to 18-MAY-01 00:55:00 (CST)
Location: GOULD
Magnitude: 50 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in MCCLAIN, OKLAHOMA
From 18-MAY-01 02:05:00 to 18-MAY-01 02:05:00 (CST)
Location: DIBBLE
Property damage: 25K
Reported by: LAW ENFORCEMENT

One mobile home and five barns were destroyed. Another mobile home was damaged, and trees were downed.

Thunderstorm Wind in POTTAWATOMIE, OKLAHOMA
From 18-MAY-01 03:05:00 to 18-MAY-01 03:05:00 (CST)
Location: SHAWNEE
Property damage: 2K
Reported by: EMERGENCY MANAGER

A few trees were downed.

Hail in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:24:00 to 18-MAY-01 02:24:00 (CST)
Location: NORMAN
Magnitude: 0.88 
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in KIOWA, OKLAHOMA
From 18-MAY-01 01:00:00 to 18-MAY-01 01:00:00 (CST)
Location: HOBART
Magnitude: 51 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:15:00 to 18-MAY-01 02:15:00 (CST)
Location: MOORE
Property damage: 25K
Reported by: NEWSPAPER

A greenhouse was destroyed at Walmart.

Thunderstorm Wind in MCCLAIN, OKLAHOMA
From 18-MAY-01 02:05:00 to 18-MAY-01 02:05:00 (CST)
Location: PURCELL
Property damage: 10K
Reported by: NEWSPAPER

The front end of the Hope Hardware Store was blown off.

Thunderstorm Wind in CARTER, OKLAHOMA
From 18-MAY-01 02:52:00 to 18-MAY-01 02:52:00 (CST)
Location: ARDMORE
Magnitude: 56 M
Property damage: 15K
Reported by: EMERGENCY MANAGER

Metal roof at Days Inn was damaged.

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 18-MAY-01 02:24:00 to 18-MAY-01 02:24:00 (CST)
Location: NORMAN
Magnitude: 52 E
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in JACKSON, OKLAHOMA
From 17-MAY-01 23:21:00 to 17-MAY-01 23:21:00 (CST)
Location: ELDORADO
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in JACKSON, OKLAHOMA
From 17-MAY-01 23:28:00 to 17-MAY-01 23:28:00 (CST)
Location: ELDORADO
Magnitude: 1.75 
Reported by: AMATEUR RADIO

Thunderstorm Wind in JACKSON, OKLAHOMA
From 18-MAY-01 00:40:00 to 18-MAY-01 00:40:00 (CST)
Location: ALTUS
Magnitude: 52 E
Reported by: AMATEUR RADIO

Thunderstorm Wind in KIOWA, OKLAHOMA
From 18-MAY-01 00:35:00 to 18-MAY-01 00:35:00 (CST)
Location: HOBART
Magnitude: 64 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in HARMON, OKLAHOMA
From 18-MAY-01 00:05:00 to 18-MAY-01 00:05:00 (CST)
Location: GOULD
Magnitude: 55 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in KIOWA, OKLAHOMA
From 18-MAY-01 00:40:00 to 18-MAY-01 00:40:00 (CST)
Location: HOBART
Magnitude: 59 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in STEPHENS, OKLAHOMA
From 18-MAY-01 02:35:00 to 18-MAY-01 02:35:00 (CST)
Location: VELMA
Magnitude: 50 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in KIOWA, OKLAHOMA
From 18-MAY-01 00:30:00 to 18-MAY-01 00:30:00 (CST)
Location: HOBART
Magnitude: 54 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Thunderstorm Wind in CADDO, OKLAHOMA
From 18-MAY-01 00:50:00 to 18-MAY-01 00:50:00 (CST)
Location: HINTON
Magnitude: 57 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma mesonet.

Hail in GRANT, OKLAHOMA
From 17-MAY-01 14:50:00 to 17-MAY-01 14:50:00 (CST)
Location: POND CREEK
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Hail in BECKHAM, OKLAHOMA
From 17-MAY-01 20:05:00 to 17-MAY-01 20:05:00 (CST)
Location: SAYRE
Magnitude: 1.75 
Reported by: AMATEUR RADIO

Thunderstorm Wind in KINGFISHER, OKLAHOMA
From 17-MAY-01 22:41:00 to 17-MAY-01 22:41:00 (CST)
Location: KINGFISHER
Property damage: 2.5K
Reported by: EMERGENCY MANAGER

Four or five power poles were snapped.

Hail in HUGHES, OKLAHOMA
From 18-MAY-01 04:10:00 to 18-MAY-01 04:10:00 (CST)
Location: CITRA
Magnitude: 1.00 
Reported by: GENERAL PUBLIC

Thunderstorm Wind in HARMON, OKLAHOMA
From 18-MAY-01 00:10:00 to 18-MAY-01 00:10:00 (CST)
Location: GOULD
Magnitude: 62 M
Reported by: AWOS,ASOS,MESONET,ETC

Wind was measured by Oklahoma Mesonet.