Isolated high-based supercell thunderstorms initiated over the northwestern South Plains and the extreme southwestern Panhandle of west Texas during the late afternoon hours of the 17th.  These storms produced damaging thunderstorm winds and large hail up to the size of golfballs as they impacted portions of Lamb and Castro Counties.  During the late evening hours, a complex of thunderstorms evolved and swept eastward over the northern South Plains.  These storms generated a series of downbursts that eventually congealed into a large cold pool of thunderstorm outflow.  Wind speeds were measured as high as 76 mph near Amherst (Lamb County) with this activity. Over $200,000 in damage occurred in Lamb County.

Hail in BAILEY, TEXAS
From 17-JUN-10 16:38:00 to 17-JUN-10 16:38:00 (CST-6)
Location: MULESHOE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in LAMB, TEXAS
From 17-JUN-10 17:25:00 to 17-JUN-10 17:25:00 (CST-6)
Location: SUDAN
Magnitude: 56.00 EG
Property damage: 125.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A National Weather Service post-storm survey revealed that damaging thunderstorm winds destroyed a center-pivot irrigation system just south of U.S. Highway 70 north of Sudan.  The event time is estimated based on Doppler radar data.

Hail in LAMB, TEXAS
From 17-JUN-10 17:56:00 to 17-JUN-10 17:56:00 (CST-6)
Location: EARTH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LAMB, TEXAS
From 17-JUN-10 18:33:00 to 17-JUN-10 18:33:00 (CST-6)
Location: OLTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in CASTRO, TEXAS
From 17-JUN-10 18:03:00 to 17-JUN-10 18:03:00 (CST-6)
Location: NAZARETH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LAMB, TEXAS
From 17-JUN-10 20:05:00 to 17-JUN-10 20:20:00 (CST-6)
Location: EARTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple reports of wind gusts estimated in excess of 60 mph were received from law enforcement and storm spotters along a swath from south of Earth to near Springlake.  Large tree limbs were reportedly broken by the winds in Springlake, and hail up to the size of quarters accompanied the winds at times.

Hail in LAMB, TEXAS
From 17-JUN-10 18:07:00 to 17-JUN-10 18:15:00 (CST-6)
Location: SPRINGLAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 200.00K
Reported by: Trained Spotter

Storm spotters reported quarter size hail accompanied by thunderstorm wind gusts in excess of 60 mph south of Springlake.  Local farmers and newspaper articles reported that the hail crushed newly planted cotton crops.

Thunderstorm Wind in LAMB, TEXAS
From 17-JUN-10 21:30:00 to 17-JUN-10 21:30:00 (CST-6)
Location: AMHERST
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A downburst resulted in intense thunderstorm winds over portions of Lamb County around 21:30 CST.  The Texas Tech University West Texas Mesonet site near Amherst recorded a peak gust of 76 mph.  No significant damages were reported.

Hail in LAMB, TEXAS
From 17-JUN-10 18:44:00 to 17-JUN-10 18:44:00 (CST-6)
Location: OLTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Local fire department officials reported golfball size hail in Olton. No significant damages were reported.

Thunderstorm Wind in PARMER, TEXAS
From 17-JUN-10 22:09:00 to 17-JUN-10 22:09:00 (CST-6)
Location: FRIONA
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Tech University West Texas Mesonet site near Friona measured a thunderstorm downburst wind gust of 62 mph.  No damage was reported.

Thunderstorm Wind in HALE, TEXAS
From 17-JUN-10 22:20:00 to 17-JUN-10 22:20:00 (CST-6)
Location: PLAINVIEW
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Tech University West Texas Mesonet site near Plainview measured a thunderstorm downburst wind gust of 60 mph at 22:20 CST. No damages were reported.

Thunderstorm Wind in LAMB, TEXAS
From 17-JUN-10 18:07:00 to 17-JUN-10 18:15:00 (CST-6)
Location: SPRINGLAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 100.00K
Reported by: Trained Spotter

Storm spotters reported thunderstorm wind gusts in excess of 60 mph accompanied by quarter size hail south of Springlake.  Local farmers and newspaper articles reported that the wind-blown hail crushed newly planted cotton crops.