An elongated mid-level trough positioned from the Midwest to the Baja Peninsula provided the large scale forcing to help numerous thunderstorms to develop during the afternoon and evening hours of the 9th.  Residual surface outflow boundaries also provided low level forcing to allow developing thunderstorms obtain access to marginal to moderate elevated instability across the Texas Panhandle. However, the thunderstorms that developed across the southeastern Texas Panhandle had the more favorable environment for development thanks to a relative maximum of elevated instability and ample deep layer shear. Several reports of hail were relayed to the National Weather Service as thunderstorms moved across the southeastern Texas Panhandle with golf ball being the largest size given. While hail was the primary hazard for this event a 60 mph thunderstorm wind gust was observed in Potter County as the upper level trough axis rotated through the Texas Panhandle. Convection across the Texas Panhandle ended prior to 9 PM CST due to the upper level forcing progressing to the east.

Hail in GRAY, TEXAS
From 09-MAY-13 18:23:00 to 09-MAY-13 18:28:00 (CST-6)
Location: LEFORS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The merger of two discrete thunderstorms over central Gray County caused the production of hail from quarter to golf ball size. The Gray County Emergency Manager reported that the hail accumulated enough to cover the ground in the town of Lefors (Gray County). The merged storms slowly tracked to the south before disipating over northern Donley County.

Hail in GRAY, TEXAS
From 09-MAY-13 18:41:00 to 09-MAY-13 18:44:00 (CST-6)
Location: LEFORS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The merger of two discrete thunderstorms over central Gray County caused the production of hail from quarter to golf ball size. A trained storm spotter in Lefors (Gray County) reported golf ball hail in the city. The merged storms slowly tracked to the south before disipating over northern Donley County.

Hail in GRAY, TEXAS
From 09-MAY-13 18:51:00 to 09-MAY-13 18:55:00 (CST-6)
Location: LEFORS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A decaying thunderstorm from a prior storm merger produced quarter size hail 1 mile south of Lefors (Gray County) as reported by the Gray County Emergency Manager. Four inches of accumulated quarter size hail was also reported by the Gray County Emergency Manager on US Highway 273. This created slick road conditions, but no vehicle accidents were reported.

Hail in DONLEY, TEXAS
From 09-MAY-13 16:51:00 to 09-MAY-13 16:57:00 (CST-6)
Location: HOWARDWICK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

As a thunderstorm developed over Donley County, it produced nickel size hail 5 miles southwest of Howardwick (Donley County). This storm slowly moved to the northeast and began to quickly decay due to the inflow getting cut off by another developing thunderstorm to the south. Before dissipating this thunderstorm also produced pea size hail one mile northwest of Howardwick (Donley County).

Thunderstorm Wind in POTTER, TEXAS
From 09-MAY-13 19:46:00 to 09-MAY-13 19:47:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A collapsing thunderstorm produced a 60 mph wind gust. A storm chaser for a local broadcast media outlet observed this wind gust at the fork of US Highway 287 and Interstate 40 (Potter County). No damage or injuries were associated with this wind gust.

Hail in DONLEY, TEXAS
From 09-MAY-13 17:02:00 to 09-MAY-13 17:12:00 (CST-6)
Location: ASHTOLA
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A thunderstorm developed over southern Donley County and slowly drifted to the south while intensifying. A storm chaser intercepted this thunderstorm as it crossed US Highway 287 5 miles west-southwest of Greenbelt Lake (Donley County). By that point the thunderstorm was producing copious amounts of hail up to golf ball size. Three to four inches of hail accumulation was estimated by the storm chaser on the highway. This created slick spots on US Highway 287 which caused a few motorist to lose control and swerve into the ditch. No injuries were reported with these accidents.