The combination of an upper level short wave, high pwat values, and slow storm motions lead to severe weather and flash flooding across the Oklahoma and Texas Panhandles from the late night hours of the 18th through the late morning hours of the 19th.
Scattered thunderstorms developed along a stationary boundary in southeastern Colorado during the late night hours of the 18th. These thunderstorms moved to the east-southeast off of the boundary and entered the western Oklahoma and northwestern Texas Panhandle around 9 PM CST. Thunderstorms slowly intensified as they moved into the more unstable portions of the Panhandles and began producing isolated downbursts after 11 PM CST. These thunderstorms blew power poles down which caused power outages for several communities across Lipscomb County. Scattered thunderstorms continued moving to the east-southeast 2 AM CST on the 19th. After this point a series of training thunderstorm developed from the central Oklahoma Panhandle into the south central Texas Panhandle. These thunderstorms produced isolated downburst and hail along this line until 8 AM CST. Lightning from these thunderstorms caused a brief power outage for 3,056 Xcel Energy customers on the southeast side of Amarillo (Randall County).

Thunderstorm Wind in SHERMAN, TEXAS
From 18-JUN-13 23:07:00 to 18-JUN-13 23:08:00 (CST-6)
Location: LAUTZ
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered thunderstorms moved into the northern Texas Panhandle during the late night hours of the 18th. A thunderstorm produced a downburst 10 miles east of the town of Stratford (Sherman County). A storm spotter in this location reported he was almost blown off the road by the gust and estimated the winds to be 60 mph.

Thunderstorm Wind in LIPSCOMB, TEXAS
From 19-JUN-13 03:50:00 to 19-JUN-13 03:52:00 (CST-6)
Location: DARROUZETT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A discrete thunderstorm moved into Lipscomb County from the north-northwest. As it moved across the county it briefly intensified as it moved near the town of Darrouzett (Lipscomb County), before collapsing. As it collapsed, it produced a downburst that blew down 10 power poles 5 miles west of the city. This caused power outages in Darrouzett, Follett, Higgins, and Booker (Lipscomb County) that lasted well into the afternoon hours of the 19th as reported by Xcel Energy.

Hail in CARSON, TEXAS
From 19-JUN-13 05:13:00 to 19-JUN-13 05:15:00 (CST-6)
Location: SKELLYTOWN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A discrete supercell moved southeastward across Carson County during the morning hours of the 19th. As the storm moved south of Skellytown (Carson County) it produced golfball size hail (1.75 inches). The thunderstorm weakened slightly after producing this hail, and continued to move across the county to the southeast.

Thunderstorm Wind in CARSON, TEXAS
From 19-JUN-13 05:20:00 to 19-JUN-13 05:22:00 (CST-6)
Location: SKELLYTOWN
Magnitude: 50.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Public

A discrete thunderstorm moved southeastward across Carson County during the morning hours of the 19th. The outflow from this storm lifted a trampoline in Skellytown (Carson County), and lofted it into a tree. The thunderstorm continued moving to the southeast after producing this outflow.