A cluster of strong to severe thunderstorms developed across the Southern South Plains during the late afternoon and evening in conjunction with an upper level disturbance and strong moisture advection. These storms continued to expand in coverage and produce isolated severe wind and hail while moving northeast into Lubbock. At the same time, a discrete supercell thunderstorm was able to ingest unperturbed warm and moist air west of Post in Garza County. This storm also produced large hail and severe wind gusts. Widespread flooding then occurred as storms trained over Lubbock, resulting in multiple road closures and flooded vehicles. Flash flooding also impacted areas between Kalgary and White River Lake in southeast Crosby County through northeast Garza County where the above mentioned supercell remained nearly stationary through much of the evening.

Thunderstorm Wind in GARZA, TEXAS
From 14-MAY-15 18:55:00 to 14-MAY-15 19:12:00 (CST-6)
Location: GRAHAM CHAPEL
Magnitude: 51.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

The Texas Tech University West Texas Mesonet site southwest of Graham measured a 59 mph wind gust as a thunderstorm moved through. This swath of damaging downburst winds continued northeast into Post, producing tree damage and lifting the roof off of a shed.

Hail in GARZA, TEXAS
From 14-MAY-15 20:16:00 to 14-MAY-15 20:19:00 (CST-6)
Location: AUGUSTUS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser reported quarter sized hail and wind gusts to 60 mph as a supercell thunderstorm occurred five to ten miles southwest of Kalgary.

Hail in LUBBOCK, TEXAS
From 14-MAY-15 19:02:00 to 14-MAY-15 19:02:00 (CST-6)
Location: WOLFFORTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A NWS Employee reported quarter sized hail south of Wolfforth.

Flood in LUBBOCK, TEXAS
From 14-MAY-15 19:42:00 to 14-MAY-15 20:50:00 (CST-6)
Location: LUBBOCK AIRPARK
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Employee

Numerous reports of flooded roadways were received throughout the evening as three rounds of intense rainfall moved over the city, most notably over the southwestern side of town. Almost every major intersection between Milwaukee Avenue and Quaker Avenue was flowing with water, with the greatest impact being between 98th and 82nd Streets. Several cars were stranded in high water, as up to 2.5 inches of rain fell over the course of an hour and a half.

Flash Flood in CROSBY, TEXAS
From 14-MAY-15 21:50:00 to 14-MAY-15 23:45:00 (CST-6)
Location: KALGARY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A supercell thunderstorm, which initiated west of Post in Garza County, moved northeast to near Kalgary and White River Lake. This storm became nearly stationary, producing radar estimated rainfall as high as six to eight inches in a 2 hour period. A NWS Storm Survey was conducted the following day, finding water still flowing across several farm to market roads as well as numerous areas of mud. One of these actually caused a road grader to become stuck while trying to remove mud off of a roadway near Kalgary. A high water rescue was also performed in this area the previous night. The abundant rainfall brought swiftly flowing water back to nearby portions of the Brazos River.

Thunderstorm Wind in BAILEY, TEXAS
From 14-MAY-15 18:17:00 to 14-MAY-15 18:17:00 (CST-6)
Location: BULA
Magnitude: 52.00 EG
Property damage: 0.80K
Crop damage: 0.00K
Reported by: Broadcast Media

Local media relayed a report of carport damage in Bula as severe downburst winds moved overhead.

Hail in LUBBOCK, TEXAS
From 14-MAY-15 19:36:00 to 14-MAY-15 20:00:00 (CST-6)
Location: WOLFFORTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained weather spotter and several public citizens observed quarter sized hail from southeast of Wolfforth through much of the southwest side of Lubbock. No damage was reported.