The combination of a moderately unstable atmosphere, decent deep layer shear, and the presence of a stalled frontal boundary led to a severe weather outbreak during the evening and overnight hours of the 7th. The 6 PM CST upper air soundings out of Amarillo, Texas and Dodge City, Kansas showed surface based instability between 1700 and 2500 J/kg with deep layer shear around 32 kt across the Oklahoma Panhandle. As daytime heating maximized during the early afternoon discrete thunderstorms began developing across the western Texas and Oklahoma Panhandle. After briefly moving to the north these discrete thunderstorms turn to the right and began moving to the east across the panhandle. These discrete thunderstorms would produce hail across the Oklahoma Panhandle up to the size of baseballs. One discrete thunderstorm over eastern Texas County and western Beaver County developed near enough to the stationary boundary for the additional low level wind shear to help develop a brief tornado. The tornado lasted less than ten minutes and the parent thunderstorms quickly diminished as it moved eastward into Beaver County. By 7 PM CST, discrete thunderstorms over the western Oklahoma Panhandle began forming into a squall line. This line would go on to traverse the Oklahoma Panhandle producing 60 to 70 mph gusts and ping pong ball size hail before entering western Oklahoma by midnight of the 8th.

Thunderstorm Wind in CIMARRON, OKLAHOMA
From 07-AUG-13 16:50:00 to 07-AUG-13 16:52:00 (CST-6)
Location: BOISE CITY
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A developing squall line moved into the western Oklahoma Panhandle during the early evening hours of the 7th. The Oklahoma Mesonet site 3 miles south-southeast of Boise City (Cimarron County) reported a 63 mph thunderstorm wind gust as the squall line moved overhead. This squall line would go on to move eastward across the entire panhandle.

Hail in CIMARRON, OKLAHOMA
From 07-AUG-13 17:30:00 to 07-AUG-13 17:32:00 (CST-6)
Location: KEYES
Magnitude: 2.75 
Property damage: 16.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A discrete thunderstorm developed across western Cimarron County during the early evening hours of the 7th. The thunderstorm quickly intensified and after initially on a northward track the storm turned to the east. As the thunderstorm moved over the town of Keyes (Cimarron County), a Cimarron County Sheriff's Deputy reported baseball size hail (2.75 inches) broke out 8 county vehicle windshields. After producing this hail the thunderstorm continued moving to the east before dissipating over western Texas County.

Hail in TEXAS, OKLAHOMA
From 07-AUG-13 18:34:00 to 07-AUG-13 18:36:00 (CST-6)
Location: TYRONE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A discrete thunderstorm developed over the eastern portion of Texas County during the early evening hours of the 7th. The thunderstorm quickly intensified and slowly moved eastward across the county. The Texas County Emergency Manager reported that the thunderstorm produced ping pong ball size hail (1.50 inches) 3 miles north-northwest of Baker (Cimarron County). After producing this hail the thunderstorm continued a slow eastward track across Texas County before entering Beaver County shortly before 7 PM CST.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 20:35:00 to 07-AUG-13 20:36:00 (CST-6)
Location: HOOKER
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Texas County, the Oklahoma Mesonet site 1 mile west of Hooker (Texas County) reported a 65 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Thunderstorm Wind in BEAVER, OKLAHOMA
From 07-AUG-13 22:08:00 to 07-AUG-13 22:09:00 (CST-6)
Location: BEAVER
Magnitude: 52.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Emergency Manager

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Beaver County the county Emergency Manager reported that 3 to 4 inch diameter tree branches were blown down in the town of Beaver (Beaver County). The squall line continued to move to the east after producing this damage and exited the panhandle by midnight of the 8th.

Thunderstorm Wind in CIMARRON, OKLAHOMA
From 07-AUG-13 18:35:00 to 07-AUG-13 18:37:00 (CST-6)
Location: BOISE CITY
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Cimarron County, the Oklahoma Mesonet site 3 miles south-southeast of Boise City (Cimarron County) reported a 64 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 20:00:00 to 07-AUG-13 20:02:00 (CST-6)
Location: GOODWELL
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Texas County, the Oklahoma Mesonet site 2 miles east of Goodwell (Texas County) reported a 66 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 20:40:00 to 07-AUG-13 20:41:00 (CST-6)
Location: HOOKER
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Texas County, the Oklahoma Mesonet site 1 mile west of Hooker (Texas County) reported a 60 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Hail in CIMARRON, OKLAHOMA
From 07-AUG-13 16:10:00 to 07-AUG-13 16:12:00 (CST-6)
Location: BOISE CITY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A discrete thunderstorm developed across western Cimarron County during the early evening hours of the 7th. The thunderstorm quickly intensified and after initially on a northward track the storm turned to the east. the Cimarron County Emergency Manager reported at the thunderstorm produced baseball size hail (2.75 inches) 4 miles north-northwest of Boise City (Cimarron County). After producing this hail the thunderstorm continued moving to the east before dissipating over western Texas County.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 20:05:00 to 08-AUG-13 20:06:00 (CST-6)
Location: GOODWELL
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Texas County, the Oklahoma Mesonet site 2 miles east of Goodwell (Texas County) reported a 68 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Thunderstorm Wind in BEAVER, OKLAHOMA
From 07-AUG-13 21:34:00 to 07-AUG-13 21:35:00 (CST-6)
Location: TURPIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved into Beaver County, the Beaver County Emergency Manager reported an estimated 60 mph thunderstorm wind gust in the town of Turpin (Beaver County). The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 20:30:00 to 07-AUG-13 20:31:00 (CST-6)
Location: HOOKER
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Texas County, the Oklahoma Mesonet site 1 mile west of Hooker (Texas County) reported a 65 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Hail in CIMARRON, OKLAHOMA
From 07-AUG-13 17:04:00 to 07-AUG-13 17:06:00 (CST-6)
Location: KEYES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A discrete thunderstorm developed across western Cimarron County during the early evening hours of the 7th. The thunderstorm quickly intensified and after initially on a northward track the storm turned to the east. A local law enforcement officer 7 miles west of Keyes (Cimarron County) reported golf ball size hail (1.75 inches).  After producing this hail the thunderstorm continued moving to the east before dissipating over western Texas County.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 20:32:00 to 07-AUG-13 20:33:00 (CST-6)
Location: HOOKER
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A squall line moved across the Oklahoma Panhandle during the late night hours of the 7th. As the squall line moved across Texas County, the KVII Schoolnet site at Hooker Junior High School 3 miles north-northeast of Hooker (Texas County) reported a 59 mph thunderstorm wind gust. The squall line continued to move to the east after producing this gust and exited the panhandle by midnight of the 8th.

Hail in CIMARRON, OKLAHOMA
From 07-AUG-13 17:15:00 to 07-AUG-13 17:17:00 (CST-6)
Location: KEYES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A discrete thunderstorm developed across western Cimarron County during the early evening hours of the 7th. The thunderstorm quickly intensified and after initially on a northward track the storm turned to the east. As the thunderstorm moved over the town of Keyes (Cimarron County), a Cimarron County Sheriff's Deputy reported golf ball size hail (1.75 inches) in town. After producing this hail the thunderstorm continued moving to the east before dissipating over western Texas County.

Hail in TEXAS, OKLAHOMA
From 07-AUG-13 18:07:00 to 07-AUG-13 18:09:00 (CST-6)
Location: TYRONE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A discrete thunderstorm developed over the eastern portion of Texas County during the early evening hours of the 7th. The thunderstorm quickly intensified and slowly moved eastward across the county. A trained storm spotter reported that the thunderstorm produced ping pong size hail (1.50 inches) 3 miles southeast of the town of Tyrone (Texas County) and a funnel cloud. The thunderstorm continued a slow eastward track across Texas County before entering Beaver County shortly before 7 PM CST.

Thunderstorm Wind in TEXAS, OKLAHOMA
From 07-AUG-13 18:25:00 to 07-AUG-13 18:26:00 (CST-6)
Location: BAKER
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

A discrete thunderstorm developed over the eastern portion of Texas County during the early evening hours of the 7th. The thunderstorm quickly intensified and slowly moved eastward across the county. A member of the public in the town of Baker (Texas County) reported that a wind gust produced by the thunderstorm caused roof damage to a farm building. After producing this damage the thunderstorm continued a slow eastward track across Texas County before entering Beaver County shortly before 7 PM CST.

Hail in CIMARRON, OKLAHOMA
From 07-AUG-13 17:29:00 to 07-AUG-13 17:30:00 (CST-6)
Location: KEYES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A discrete thunderstorm developed across western Cimarron County during the early evening hours of the 7th. The thunderstorm quickly intensified and after initially on a northward track the storm turned to the east. As the thunderstorm moved over the town of Keyes (Cimarron County), a Cimarron County Sheriff's Deputy reported golf ball size hail (1.75 inches) in town. After producing this hail the thunderstorm continued moving to the east before dissipating over western Texas County.

Tornado in BEAVER, OKLAHOMA
From 07-AUG-13 18:36:00 to 07-AUG-13 18:42:00 (CST-6)
Location: TURPIN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak EF0 tornado touched down 3.5 miles west-southwest of Turpin, Oklahoma during the evening hours of the 7th. A supercell thunderstorm spawned the tornado, which lasted for 6 minutes but produced no damage. The maximum wind speed was estimated to be 65 mph.