A severe weather outbreak brought hail, damaging winds, and tornadoes to portions of the Oklahoma Panhandle from the afternoon of the 28th into the early morning hours of the 29th. The morning upper air analysis on the 28th showed a mid-level shortwave trough rotating around the base of a longwave trough situated from Idaho to Arizona. At the surface, a dryline was situated from the northeastern Oklahoma Panhandle to the southwestern Texas Panhandle. The 6 AM CST upper air sounding from Amarillo showed a low level capping inversion with significant elevated instability. Also deep layer shear was primed for the development of discrete supercells. By noon, the northern portion of the dryline had moved into south central Kansas before stretching back into the southwestern Texas Panhandle, as instability values increased across the area. At this time, the combination of a residual cold frontal boundary and the dryline helped to form two landspout tornadoes as thunderstorms developed along the dryline across Beaver County. These tornadoes formed over undeveloped land and produced little damage.
During the late evening the dryline began to retreat westward as the nocturnal low level jet transported moisture from the Gulf of Mexico northwestward. This allowed the remnants of a supercell that brought severe weather to the Texas Panhandle to move into Beaver County. These storms produced isolated downbursts while decaying over the county.

Tornado in BEAVER, OKLAHOMA
From 28-MAY-13 14:08:00 to 28-MAY-13 14:11:00 (CST-6)
Location: CLEAR LAKE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A landspout tornado formed during the afternoon hours of the 28th. Eye-witness accounts described the landspout as a brief spin-up that started from the ground and connected with the base of a developing thunderstorm. Several pictures were taken by the eye-witnesses from U.S. Highway 83 approximately 4 miles south of Beaver (Beaver County). A National Weather Service survey team, using the eye-witness accounts, located the track of this landspout. Very little damage was evident given the landspout formed over grasslands and away from developed real estate. The max estimated wind speed was 60 mph. No injuries or fatalities were associated with this landspout tornado.

Tornado in BEAVER, OKLAHOMA
From 28-MAY-13 14:29:00 to 28-MAY-13 14:40:00 (CST-6)
Location: FORGAN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A landspout tornado formed during the afternoon hours of the 28th near the town of Beaver (Beaver County). Eye-witness accounts stated the landspout developed north of the Beaver Sand Dunes State Park east of State Road 23. A National Weather Service survey team located the start of the track approximately 4 miles north of Beaver (Beaver County). Eye-witness reported that the landspout traveled to the northwest, crossed State Road 23, and traveled west of State Road 23 before dissipating approximately 5 miles north-northwest of Beaver (Beaver County). The survey team verified the eye-witness accounts and noted that little damage was evident since the landspout formed over undeveloped grassland. The estimated max wind speed with this tornado was 60 mph. No injuries or fatalities were associated with this landspout.

Hail in BEAVER, OKLAHOMA
From 28-MAY-13 15:08:00 to 28-MAY-13 15:09:00 (CST-6)
Location: FORGAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A discrete supercell thunderstorm developed along a retreating dryline during the evening hours of the 28th. As the storm moved to the northwest it began producing hail across the northern portion of Beaver County. The Beaver County Emergency Manager reported ping pong ball size hail north of the city of Forgan (Beaver County). The supercell continued moving to the northwest before weakening slightly as it moved into southern Kansas.

Hail in BEAVER, OKLAHOMA
From 28-MAY-13 15:43:00 to 28-MAY-13 15:45:00 (CST-6)
Location: FLORIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A discrete supercell thunderstorm developed along a retreating dryline during the evening hours of the 28th. As the storm moved to the northwest it produced hail across the northern portion of Beaver County. The Beaver County Emergency Manager reported quarter size hail east of the city of Floris (Beaver County). The supercell continued moving to the northwest before weakening slightly as it moved into southern Kansas.

Thunderstorm Wind in BEAVER, OKLAHOMA
From 28-MAY-13 17:58:00 to 28-MAY-13 18:00:00 (CST-6)
Location: ELMWOOD
Magnitude: 56.00 EG
Property damage: 800.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A cluster of thunderstorms developed along a retreating dryline across the north central Texas Panhandle, moved to the northeast, and entered Beaver County. While over the city of Elmwood (Beaver County), the thunderstorms produced a localized downburst that blew 8 power poles down. The Beaver County Emergency Manager relayed a report of the damage to the National Weather Service office in Amarillo (Potter County). The cluster of thunderstorms would continue a northeastern track before dissipating over southern Kansas.

Thunderstorm Wind in BEAVER, OKLAHOMA
From 28-MAY-13 18:10:00 to 28-MAY-13 18:11:00 (CST-6)
Location: BEAVER
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A cluster of thunderstorms developed along a retreating dryline across the north central Texas Panhandle, moved to the northeast, and entered Beaver County. As the thunderstorms were over the city of Beaver (Beaver County), the Oklahoma Mesonet recorded a downburst gust of 59 mph. The cluster of thunderstorms would continue a northeastern track before dissipating over southern Kansas.

Thunderstorm Wind in BEAVER, OKLAHOMA
From 28-MAY-13 18:21:00 to 28-MAY-13 18:22:00 (CST-6)
Location: BEAVER
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A cluster of thunderstorms developed along a retreating dryline across the north central Texas Panhandle, moved to the northeast, and entered Beaver County. As the thunderstorms were over the city of Beaver (Beaver County), the Oklahoma Mesonet recorded a downburst gust of 68 mph. The cluster of thunderstorms would continue a northeastern track before dissipating over southern Kansas.