An upper level trough moved onshore along the west coast on the 13th, and continued east toward the plains. The storm system strengthened as it moved east of the Rocky mountains, eventually becoming a major storm system, with blizzard conditions on the west and north sides of it, and powerful thunderstorms to the south and east. A surface low pressure moved from the Texas panhandle into southern Kansas, with a dry line extending to the south. The dry line moved quickly east before slowing to the east of I-35 in Oklahoma. Dew point temperatures reached the middle 60s east of the dry line, with bone-dry conditions advecting in on the back side of the dry line. The cap that was in place was all but erased by mid afternoon, and thunderstorms quickly developed over eastern Oklahoma. The wind shear in place was more than sufficient for rotating thunderstorms, with most storms become supercells. Very large hail and wind damage was common early in the thunderstorm life cycle. A weak tornado developed northwest of Stroud, with other storms showing signs of rotation by late afternoon. Additional tornadoes developed through the early evening, with a couple of them doing damage. The tornadoes were in addition to the hail up to softball size. By late evening, at least five tornadoes were reported, with one of them rated and EF-3.

Hail in MURRAY, OKLAHOMA
From 14-APR-11 15:21:00 to 14-APR-11 15:21:00 (CST-6)
Location: HICKORY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in LINCOLN, OKLAHOMA
From 14-APR-11 15:23:00 to 14-APR-11 15:23:00 (CST-6)
Location: SPARKS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MURRAY, OKLAHOMA
From 14-APR-11 18:05:00 to 14-APR-11 18:05:00 (CST-6)
Location: DAVIS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MURRAY, OKLAHOMA
From 14-APR-11 15:30:00 to 14-APR-11 15:30:00 (CST-6)
Location: SULPHUR
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail sizes ranged from quarter to soft-ball size.

Hail in PONTOTOC, OKLAHOMA
From 14-APR-11 18:20:00 to 14-APR-11 18:20:00 (CST-6)
Location: FITTSTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 19:04:00 to 14-APR-11 19:10:00 (CST-6)
Location: REDDEN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A tornado was observed by a storm chaser that developed south-southwest of Redden and moved east-northeast into Pushmataha County (see Storm Data for eastern Oklahoma for the Pushmataha County portion of this tornado.)  This tornado produced no known damage.

Hail in POTTAWATOMIE, OKLAHOMA
From 14-APR-11 15:30:00 to 14-APR-11 15:30:00 (CST-6)
Location: SHAWNEE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in LINCOLN, OKLAHOMA
From 14-APR-11 18:45:00 to 14-APR-11 18:45:00 (CST-6)
Location: WARWICK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in LINCOLN, OKLAHOMA
From 14-APR-11 15:40:00 to 14-APR-11 15:40:00 (CST-6)
Location: STROUD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few small trees were blown down. The damage was done by the RFD portion of the storm. Monetary damages were estimated.

Hail in POTTAWATOMIE, OKLAHOMA
From 14-APR-11 15:45:00 to 14-APR-11 15:45:00 (CST-6)
Location: TECUMSEH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JOHNSTON, OKLAHOMA
From 14-APR-11 19:00:00 to 14-APR-11 19:00:00 (CST-6)
Location: MILL CREEK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in JOHNSTON, OKLAHOMA
From 14-APR-11 20:40:00 to 14-APR-11 20:40:00 (CST-6)
Location: NIDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LINCOLN, OKLAHOMA
From 14-APR-11 15:55:00 to 14-APR-11 15:55:00 (CST-6)
Location: PRAGUE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in LOVE, OKLAHOMA
From 14-APR-11 16:00:00 to 14-APR-11 16:00:00 (CST-6)
Location: OVERBROOK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BRYAN, OKLAHOMA
From 14-APR-11 21:10:00 to 14-APR-11 21:10:00 (CST-6)
Location: ACHILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PONTOTOC, OKLAHOMA
From 14-APR-11 16:00:00 to 14-APR-11 16:00:00 (CST-6)
Location: ROFF
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MURRAY, OKLAHOMA
From 14-APR-11 16:07:00 to 14-APR-11 16:07:00 (CST-6)
Location: SULPHUR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in JOHNSTON, OKLAHOMA
From 14-APR-11 16:15:00 to 14-APR-11 16:15:00 (CST-6)
Location: MILL CREEK
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POTTAWATOMIE, OKLAHOMA
From 14-APR-11 16:45:00 to 14-APR-11 16:45:00 (CST-6)
Location: JOHNSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MARSHALL, OKLAHOMA
From 14-APR-11 17:00:00 to 14-APR-11 17:00:00 (CST-6)
Location: MADILL
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in MURRAY, OKLAHOMA
From 14-APR-11 14:50:00 to 14-APR-11 14:50:00 (CST-6)
Location: DAVIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in COAL, OKLAHOMA
From 14-APR-11 17:20:00 to 14-APR-11 17:20:00 (CST-6)
Location: CENTRAHOMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MURRAY, OKLAHOMA
From 14-APR-11 15:00:00 to 14-APR-11 15:00:00 (CST-6)
Location: DAVIS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

The hail was reported on the northern side of town.

Hail in JOHNSTON, OKLAHOMA
From 14-APR-11 17:23:00 to 14-APR-11 17:23:00 (CST-6)
Location: TISHOMINGO
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in SEMINOLE, OKLAHOMA
From 14-APR-11 17:25:00 to 14-APR-11 17:25:00 (CST-6)
Location: WEWOKA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in JOHNSTON, OKLAHOMA
From 14-APR-11 17:25:00 to 14-APR-11 17:25:00 (CST-6)
Location: MILBURN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Two off-duty NWS employees observed this tornado to the south of the tornado that moved from northeast of Madill to SSW of Milburn. No known damage occurred and the tornado location was estimated.

Hail in HUGHES, OKLAHOMA
From 14-APR-11 17:38:00 to 14-APR-11 17:38:00 (CST-6)
Location: HOLDENVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in JOHNSTON, OKLAHOMA
From 14-APR-11 17:45:00 to 14-APR-11 17:45:00 (CST-6)
Location: FILLMORE
Magnitude: 4.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 18:21:00 to 14-APR-11 18:28:00 (CST-6)
Location: TUSHKA
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Another separate area of tree damage was noted north of the larger tornado that devastated Tushka. Monetary damages were estimated.

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 19:46:00 to 14-APR-11 19:51:00 (CST-6)
Location: REDDEN
Tornado F-scale: EF1
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An NWS storm survey found a barn destroyed and numerous large trees snapped or uprooted along a path from northeast of Redden to west-southwest of Daisy. Monetary damages were estimated.

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 19:59:00 to 14-APR-11 20:00:00 (CST-6)
Location: DAISY
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous large trees were snapped and uprooted by a tornado that paralleled a larger tornado to the north. Monetary damages were estimated.

Tornado in MARSHALL, OKLAHOMA
From 14-APR-11 17:03:00 to 14-APR-11 17:15:00 (CST-6)
Location: MADILL
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado began three miles north-northwest of Madill and continued northeast into Johnston county. It finally lifted three miles south-southwest of Milburn. Damage was reported to several structures, with widespread tree/power pole/line damage. Monetary damages estimates were not available.

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 18:20:00 to 14-APR-11 18:50:00 (CST-6)
Location: TUSHKA
Tornado F-scale: EF3
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A large tornado began 5 miles west-southwest of Tushka and moved east-northeast through Tushka and about 3 miles southeast of Atoka before curving to the north-northeast and dissipating around 2 miles east of Stringtown. Almost 150 homes and business' were significantly damaged or destroyed, many numerous others sustaining minor damage. Two fatalities occurred in a mobile home to the west of Tushka. Monetary damage estimates were not available, although it is thought they would be well into the millions of dollars.

Tornado in PONTOTOC, OKLAHOMA
From 14-APR-11 16:24:00 to 14-APR-11 16:25:00 (CST-6)
Location: STONEWALL
Tornado F-scale: EF1
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Radar, storm chaser, and local medial reported a small tornado. The tornado was embedded in a larger area of thunderstorm wind damage associated with the rear-flank downdraft. A number of large trees were snapped. One tree fell on top of a car, damaging it. Monetary damages were estimated.

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 19:58:00 to 14-APR-11 20:03:00 (CST-6)
Location: DAISY
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado developed to the south of Daisy in northeast Atoka County, then moved east-northeast into Pushmataha and Pittsburg Counties (see Storm Data for eastern Oklahoma for the Pushmataha and Pittsburg County segments of this tornado.)  Numerous trees were snapped or uprooted, roof damage was observed to at least two homes, and a barn suffered severe damage. Monetary damages were estimated.

Tornado in LINCOLN, OKLAHOMA
From 14-APR-11 15:42:00 to 14-APR-11 15:42:00 (CST-6)
Location: STROUD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous sources (storm chasers, emergency managers, local media) reported a brief tornado that occurred over an open field. No damage was reported as a result of the tornado, although some minor damage occurred as as result of the RFD. The time was approximate.

Thunderstorm Wind in LINCOLN, OKLAHOMA
From 14-APR-11 15:46:00 to 14-APR-11 15:46:00 (CST-6)
Location: STROUD
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Minor building and sign damage occurred as a result of the RFD portion of the storm. Monetary damages were estimated.

Tornado in JOHNSTON, OKLAHOMA
From 14-APR-11 17:15:00 to 14-APR-11 17:25:00 (CST-6)
Location: TISHOMINGO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This tornado was a continuation of the tornado that began 3 NNW of Madill in Marshall County. It continued to produce tree damage after crossing Lake Texoma into southern Marshall County.

Tornado in ATOKA, OKLAHOMA
From 14-APR-11 19:36:00 to 14-APR-11 19:39:00 (CST-6)
Location: ATOKA
Tornado F-scale: EF1
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Another area of damage occurred south of the large tornado that devastated Tushka. This tornado damaged numerous trees and power lines. Monetary damages were estimated.