Late this afternoon, a small cluster of slow-moving storms developed in far eastern New Mexico over Roosevelt and northern Lea Counties. By early evening, these storms solidified into a squall line and accelerated east across the western South Plains of Texas where strong instability resided. Although several wind gusts just shy of 58 mph were measured by various Texas Tech University West Texas Mesonet sites across the western South Plains, a few winds gusts as high as 65 mph did eventually occur later in the evening. These winds created a large dustfoot along the length of the gust front that reduced visibilities in most areas to a few miles, with isolated instances of near zero visibilities downwind of cotton fields near Wolfforth.
As the squall line entered southwest Lubbock County, an east-west oriented line of storms intersected the line and resulted in one intense storm that produced localized large hail. Of greater significance was the torrential rainfall rates up to 3.5 inches per hour over much of the city of Lubbock. Widespread rainfall totals in this area of over one inch in a short period of time resulted in widespread street flooding.
By late this night, the 140 mile-long squall line began dissipating near the Caprock Escarpment. Similar to the night before, a strong pressure gradient developed in the wake of the line and resulted in some instances of high winds and damaging gusts over the northern South Plains for periods nearly one hour in duration.

Hail in LUBBOCK, TEXAS
From 15-JUN-12 21:03:00 to 15-JUN-12 21:03:00 (CST-6)
Location: LUBBOCK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS employee estimated a few hailstones up to half-dollar size at 82nd Street and Frankford. No damage was observed.

Thunderstorm Wind in LAMB, TEXAS
From 15-JUN-12 20:10:00 to 15-JUN-12 20:13:00 (CST-6)
Location: OLTON
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Measured by a KVII-TV schoolnet site in Olton. Also, a gust to 61 mph was recorded at 813 pm CST.

Thunderstorm Wind in FLOYD, TEXAS
From 15-JUN-12 21:50:00 to 15-JUN-12 21:50:00 (CST-6)
Location: FLOYDADA MUNI ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by a Texas Tech University West Texas Mesonet station.

Thunderstorm Wind in LUBBOCK, TEXAS
From 15-JUN-12 20:47:00 to 15-JUN-12 20:47:00 (CST-6)
Location: WOLFFORTH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS employee estimated wind gusts up to 65 mph with the gust front of a squall line.

Thunderstorm Wind in LUBBOCK, TEXAS
From 15-JUN-12 21:25:00 to 15-JUN-12 21:25:00 (CST-6)
Location: SLATON
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by a Texas Tech West Texas Mesonet station.

Thunderstorm Wind in CASTRO, TEXAS
From 15-JUN-12 20:00:00 to 15-JUN-12 20:00:00 (CST-6)
Location: HART
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: COOP Observer

An NWS COOP observer relayed a damage report from the Vanderham Dairy Farm located 2.5 miles southwest of Hart. A 30-foot section of a large livestock shade was blown away by winds estimated around 70 mph. The winds also bent eight steel poles previously attached to the roof. Also, two head of cattle had to be put down after sustaining serious injuries from airborne debris. Approximately at this same time, a wind gust to 62 mph was measured by a Texas Tech University West Texas mesonet site located two miles north of Hart.

Thunderstorm Wind in CASTRO, TEXAS
From 16-JUN-12 00:05:00 to 16-JUN-12 00:05:00 (CST-6)
Location: HART
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Severe wake low winds developed along the west edge of a decaying mesoscale convective system. These winds were measured by a Texas Tech West Texas Mesonet station. Additional severe gradient wind gusts included: 58 mph at 1135 pm and 1150 pm, and 62 mph at 1155 pm.

Thunderstorm Wind in CROSBY, TEXAS
From 15-JUN-12 22:05:00 to 15-JUN-12 22:05:00 (CST-6)
Location: CROSBYTON MUNI ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by a Texas Tech University West Texas Mesonet station.

Thunderstorm Wind in HALE, TEXAS
From 16-JUN-12 01:20:00 to 16-JUN-12 01:20:00 (CST-6)
Location: ABERNATHY MUNI ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by a Texas Tech University West Texas Mesonet station.

Flood in LUBBOCK, TEXAS
From 15-JUN-12 21:25:00 to 15-JUN-12 23:30:00 (CST-6)
Location: WOLFFORTH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Soils in portions of south Lubbock were already moisture-laden from heavy rains the evening prior when torrential rainfall rates up to 3 inches per hour developed this evening. The result was widespread street flooding throughout much of the city of Lubbock and adjacent communities to its south. Many streets were reported to have several inches of either standing or flowing water with one foot of water estimated along stretches of Milwaukee Avenue between 82nd Street and 76th Street. The NWS office near South Loop 289 and University Avenue measured 1.38 inches of rain.

Dust Storm in LUBBOCK, TEXAS
From 15-JUN-12 20:34:00 to 15-JUN-12 20:39:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS employee reported visibility reduced to 50 yards in blowing dust behind the gust front of the squall line.