A large storm system moved through the southern and central Plains during the morning and afternoon of the 19th. Thunderstorms, some of them severe, had developed over the Texas panhandle and moved east into northwest and north central Oklahoma during the early morning hours. Additional development, aided by the low-level jet, occurred into parts of central Oklahoma, north of a warm front that was slowly moving north to near Interstate 40.
By mid afternoon, the well-defined front was located from parts of west-central into central Oklahoma, just north of the Oklahoma City metro area. Two thunderstorms developed near and along the front, one over Roger Mills and Dewey counties, and the other over northern Blaine county. The storms quickly became tornadic, with the first tornado of the day occurring north of Leedey in Dewey county. Another tornado, and probably the most photographed one of the day, occurred just north of Hennessey. Tornadoes, most of them brief in duration, and large hail continued  across western and central Kingfisher county, and across northern Logan, southeast Garfield, and Payne counties. Another thunderstorm developed further east along the dry line later in the afternoon, and the storm eventually produced a tornado west of Prague in Lincoln county.
Finally, two supercell thunderstorms developed further south along the dry line that moved into central Oklahoma. Although both showed significant rotation on radar, only the supercell that moved from Stephens through Murray counties produced tornadoes. Two tornadoes were reported, one just southeast of Wynnewood and another north of Sulphur.
Additional severe thunderstorms developed across southern Oklahoma, but the main impacts had shifted from tornadoes to large hail and very heavy rainfall. By the time it was all said and done, five main supercells had occurred over parts of western and central Oklahoma, producing at least nine tornadoes. Widespread significant damage did not occur due to the location/short duration of the tornadoes, and only three minor injuries were reported.

Hail in LOGAN, OKLAHOMA
From 19-MAY-10 18:04:00 to 19-MAY-10 18:07:00 (CST-6)
Location: CRESCENT
Magnitude: 3.50 
Crop damage: 0.00K
Reported by: Emergency Manager

The Logan county emergency manager reported hail from 2.75 to 3.5 inches. He reported the hail was located from 4 miles north of Crescent to 5 miles south of Crescent. Numerous windows were broken at homes on the north side of Crescent, as well as numerous car windows. Monetary damage estimates were not available.

Tornado in LINCOLN, OKLAHOMA
From 19-MAY-10 19:12:00 to 19-MAY-10 19:17:00 (CST-6)
Location: PRAGUE
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado developed approximately 5.5 miles west-northwest of Prague, destroying an outbuilding. Additional damage occurred to a tin barn and several trees 4 miles west-northwest of Prague. Radar imagery suggests the tornado lifted shortly after this. Monetary damage estimates were not available.

Tornado in MURRAY, OKLAHOMA
From 19-MAY-10 19:40:00 to 19-MAY-10 19:53:00 (CST-6)
Location: JOY
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

This is a continuation of the Garvin county tornado that began 7 miles west-southwest of Wynnewood. Structural damage was concentrated in and around the community of Joy, along Joy Rd. east of Hwy 77. Several barns and outbuildings were heavily damaged, and some homes had roof damage. Extensive tree and power pole/line damage was also noted. Further to the east-northeast a home lost part of its roof. Monetary damage estimates were not available.

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:50:00 to 19-MAY-10 18:50:00 (CST-6)
Location: NOBLE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:34:00 to 19-MAY-10 18:34:00 (CST-6)
Location: NOBLE
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:37:00 to 19-MAY-10 18:37:00 (CST-6)
Location: NORMAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:37:00 to 19-MAY-10 18:37:00 (CST-6)
Location: NORMAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MCCLAIN, OKLAHOMA
From 19-MAY-10 18:40:00 to 19-MAY-10 18:40:00 (CST-6)
Location: GOLDSBY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Golf ball- to baseball-size hail was reported in Goldsby.

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:43:00 to 19-MAY-10 18:43:00 (CST-6)
Location: NORMAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:45:00 to 19-MAY-10 18:45:00 (CST-6)
Location: NOBLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:45:00 to 19-MAY-10 18:45:00 (CST-6)
Location: LAKE THUNDERBIRD DAM
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:47:00 to 19-MAY-10 18:47:00 (CST-6)
Location: LAKE THUNDERBIRD DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in GARVIN, OKLAHOMA
From 19-MAY-10 18:50:00 to 19-MAY-10 19:00:00 (CST-6)
Location: FOSTER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in GARVIN, OKLAHOMA
From 19-MAY-10 19:10:00 to 19-MAY-10 19:10:00 (CST-6)
Location: ELMORE CITY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 19:10:00 to 19-MAY-10 19:10:00 (CST-6)
Location: LAKE THUNDERBIRD DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in POTTAWATOMIE, OKLAHOMA
From 19-MAY-10 19:36:00 to 19-MAY-10 19:36:00 (CST-6)
Location: MACOMB
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in POTTAWATOMIE, OKLAHOMA
From 19-MAY-10 19:40:00 to 19-MAY-10 19:40:00 (CST-6)
Location: ST LOUIS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GARVIN, OKLAHOMA
From 19-MAY-10 20:16:00 to 19-MAY-10 20:16:00 (CST-6)
Location: STRATFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PONTOTOC, OKLAHOMA
From 19-MAY-10 20:32:00 to 19-MAY-10 20:32:00 (CST-6)
Location: ROFF
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

No damage was reported with the wind gust.

Hail in PONTOTOC, OKLAHOMA
From 19-MAY-10 20:37:00 to 19-MAY-10 20:37:00 (CST-6)
Location: ROFF
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in PONTOTOC, OKLAHOMA
From 19-MAY-10 21:15:00 to 19-MAY-10 21:15:00 (CST-6)
Location: ADA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in COAL, OKLAHOMA
From 19-MAY-10 22:02:00 to 19-MAY-10 22:02:00 (CST-6)
Location: TUPELO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in DEWEY, OKLAHOMA
From 19-MAY-10 14:24:00 to 19-MAY-10 14:30:00 (CST-6)
Location: LEEDEY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Video and radar evidence showed a tornado northwest of Leedey. The tornado moved over open country, with no known damage occurring.

Tornado in KINGFISHER, OKLAHOMA
From 19-MAY-10 15:41:00 to 19-MAY-10 15:48:00 (CST-6)
Location: HENNESSEY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado remained nearly stationary. No known damage occurred with the tornado.

Tornado in KINGFISHER, OKLAHOMA
From 19-MAY-10 16:08:00 to 19-MAY-10 16:08:00 (CST-6)
Location: HENNESSEY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Video and radar evidence showed a brief tornado occurring 10 miles east of Hennessey. No known damage occurred with the radar. The timing and location of the tornado were estimated based on radar.

Tornado in LOGAN, OKLAHOMA
From 19-MAY-10 16:24:00 to 19-MAY-10 16:27:00 (CST-6)
Location: MARSHALL
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Video and radar evidence suggest a mostly rain-wrapped tornado occurred from 4 miles SSE of Marshall to 4 miles SE of Marshall. No known damage occurred with the tornado.

Tornado in LOGAN, OKLAHOMA
From 19-MAY-10 17:04:00 to 19-MAY-10 17:05:00 (CST-6)
Location: ORLANDO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Radar and local media coverage suggest a brief tornado occurred 2 miles southeast of Orlando. No known damage occurred with the tornado.

Tornado in GARVIN, OKLAHOMA
From 19-MAY-10 19:31:00 to 19-MAY-10 19:40:00 (CST-6)
Location: HENNEPIN
Tornado F-scale: EF0
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado developed 7 miles west-southwest of Wynnewood in Garvin county, and continued into Murray county, where the bulk of the damage occurred. Minor tree damage occurred on the Garvin county side of the tornado. Monetary damage estimates were not available.

Tornado in KINGFISHER, OKLAHOMA
From 19-MAY-10 16:33:00 to 19-MAY-10 17:00:00 (CST-6)
Location: LOYAL
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado developed just west of Loyal, where an un-anchored trailer home was destroyed and a power pole was downed. The tornado continued east toward the southern edge of Loyal, with tree damage reported in Loyal. The tornado crossed US Highway 81 north of Kingfisher, and a truck was blown off the road with the driver suffering minor injuries. Also near this location, the Department of Transportation salt barn was destroyed five miles north of Kingfisher and sign/fence damage occurred just east of this location. Monetary damage estimates were not available.

Tornado in PAYNE, OKLAHOMA
From 19-MAY-10 17:03:00 to 19-MAY-10 17:36:00 (CST-6)
Location: STILLWATER
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

Radar and video evidence showed a tornado moved from just east of Interstate 35, over Lake Carl Blackwell, to five miles west of Stillwater. Most of the damage occurred at Range and McElroy Roads. Much of the damage was confined to trees. However, a large wooden barn sustained damage, as well as a tin roof taken off a home, and other outbuildings were damaged. Monetary damage estimates were not available.

Hail in DEWEY, OKLAHOMA
From 19-MAY-10 15:50:00 to 19-MAY-10 15:50:00 (CST-6)
Location: HUCMAC
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The report was relayed by Vortex2.

Hail in BLAINE, OKLAHOMA
From 19-MAY-10 16:03:00 to 19-MAY-10 16:03:00 (CST-6)
Location: EAGLE CITY
Magnitude: 3.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in BLAINE, OKLAHOMA
From 19-MAY-10 16:04:00 to 19-MAY-10 16:04:00 (CST-6)
Location: CANTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LOGAN, OKLAHOMA
From 19-MAY-10 16:30:00 to 19-MAY-10 16:30:00 (CST-6)
Location: MARSHALL
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LOGAN, OKLAHOMA
From 19-MAY-10 17:35:00 to 19-MAY-10 17:35:00 (CST-6)
Location: MARSHALL
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in STEPHENS, OKLAHOMA
From 19-MAY-10 17:49:00 to 19-MAY-10 17:49:00 (CST-6)
Location: DUNCAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 17:56:00 to 19-MAY-10 17:56:00 (CST-6)
Location: NORMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STEPHENS, OKLAHOMA
From 19-MAY-10 17:58:00 to 19-MAY-10 17:58:00 (CST-6)
Location: DUNCAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MCCLAIN, OKLAHOMA
From 19-MAY-10 18:00:00 to 19-MAY-10 18:00:00 (CST-6)
Location: BLANCHARD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:00:00 to 19-MAY-10 18:00:00 (CST-6)
Location: NORMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:01:00 to 19-MAY-10 18:01:00 (CST-6)
Location: NORMAN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:04:00 to 19-MAY-10 18:04:00 (CST-6)
Location: NORMAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCCLAIN, OKLAHOMA
From 19-MAY-10 18:22:00 to 19-MAY-10 18:22:00 (CST-6)
Location: GOLDSBY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:26:00 to 19-MAY-10 18:26:00 (CST-6)
Location: NORMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:28:00 to 19-MAY-10 18:28:00 (CST-6)
Location: NORMAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The hail was reported at the National Weather Center.

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:28:00 to 19-MAY-10 18:28:00 (CST-6)
Location: LAKE THUNDERBIRD DAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:26:00 to 19-MAY-10 18:29:00 (CST-6)
Location: NOBLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in CLEVELAND, OKLAHOMA
From 19-MAY-10 18:30:00 to 19-MAY-10 18:30:00 (CST-6)
Location: NOBLE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DEWEY, OKLAHOMA
From 19-MAY-10 14:42:00 to 19-MAY-10 14:42:00 (CST-6)
Location: CAMARGO
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DEWEY, OKLAHOMA
From 19-MAY-10 14:42:00 to 19-MAY-10 14:42:00 (CST-6)
Location: LEEDEY
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DEWEY, OKLAHOMA
From 19-MAY-10 14:50:00 to 19-MAY-10 14:50:00 (CST-6)
Location: CAMARGO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The report was relayed by Vortex2.