Following a round of severe storms and heavy rain the night prior, strong and severe thunderstorms developed late this morning over the southwest South Plains before expanding in coverage as they spread east throughout the afternoon.  Much of this activity was driven by strong moisture advection in advance of an upper impulse.  A particularly intense storm in southern Lynn County redeveloped to the southeast over time and produced a vivid tornado just south of O'Donnell in nearby Dawson County (NWS Midland's forecast area).  Although hail and high winds were rather common place, by far the worst byproduct of these slow-moving storms was widespread flooding throughout Lubbock county.  Flash flooding was reported in Shallowater and Lubbock where dozens of cars became stranded in high water from rainfall rates measured as high as eight inches per hour.  In Shallowater, just over four inches of rain fell in 30 minutes and proceeded to flood about 75 homes with up to six inches of water.  Total damage to floors, walls and personal property could reach $10 million.  A total of 6.93 inches of rain was measured by a NWS employee in Shallowater by early evening.  One car in Shallowater was swept off the road by flowing water and carried about 100 yards in a bar ditch that transformed into a raging creek.  Fortunately, the occupant was not injured.  In Lubbock, five high water rescues were reported after motorists became stranded in high water.  The flooding also inundated four floors at the UMC Hospital which proceeded to damage some medical records.

Hail in COCHRAN, TEXAS
From 28-MAY-15 10:30:00 to 28-MAY-15 10:30:00 (CST-6)
Location: WHITEFACE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter observed hail up to quarter size covering the ground.  No damage was noted.

Thunderstorm Wind in CROSBY, TEXAS
From 28-MAY-15 13:10:00 to 28-MAY-15 13:10:00 (CST-6)
Location: RALLS
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by a Texas Tech University West Texas mesonet.

Hail in LYNN, TEXAS
From 28-MAY-15 13:50:00 to 28-MAY-15 13:50:00 (CST-6)
Location: PETTY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A swath of hail up to quarter size fell west of Tahoka. Damage was not reported.

Hail in KING, TEXAS
From 28-MAY-15 14:10:00 to 28-MAY-15 14:10:00 (CST-6)
Location: GUTHRIE 6666 ARPT
Magnitude: 2.00 
Reported by: Storm Chaser

Hail up to two inches in diameter was observed on the ground by a storm chaser.  Damage was unknown.

Hail in HOCKLEY, TEXAS
From 28-MAY-15 11:25:00 to 28-MAY-15 11:25:00 (CST-6)
Location: LEVELLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Reported by a trained spotter.  No damage was noted.

Thunderstorm Wind in COCHRAN, TEXAS
From 28-MAY-15 20:25:00 to 28-MAY-15 20:25:00 (CST-6)
Location: MORTON COCHRAN CO AR
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured by a Texas Tech University West Texas mesonet.

Thunderstorm Wind in LUBBOCK, TEXAS
From 28-MAY-15 11:50:00 to 28-MAY-15 11:50:00 (CST-6)
Location: SHALLOWATER
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

A microburst downed a power line in Shallowater which knocked out power for SPEC customers.

Flood in HOCKLEY, TEXAS
From 28-MAY-15 11:30:00 to 28-MAY-15 15:00:00 (CST-6)
Location: COBLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Flash Flood in LUBBOCK, TEXAS
From 28-MAY-15 12:15:00 to 28-MAY-15 14:00:00 (CST-6)
Location: SHALLOWATER ARPT
Flood cause: Heavy Rain
Property damage: 10.00M
Crop damage: 2.00M
Reported by: Broadcast Media

Thunderstorm Wind in LUBBOCK, TEXAS
From 28-MAY-15 12:25:00 to 28-MAY-15 12:35:00 (CST-6)
Location: DOUD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A traveling microburst downed several tree branches of two to three inches in diameter and snapped a power pole near 4th Street and Quaker Avenue.

Hail in LUBBOCK, TEXAS
From 28-MAY-15 11:54:00 to 28-MAY-15 12:14:00 (CST-6)
Location: SHALLOWATER ARPT
Magnitude: 1.50 
Property damage: 100.00K
Crop damage: 500.00K
Reported by: Public

A swath of hail up to ping pong ball size fell over Shallowater for about 20 minutes.  Minor vehicle dents were common.

Hail in LUBBOCK, TEXAS
From 28-MAY-15 12:25:00 to 28-MAY-15 12:53:00 (CST-6)
Location: REESE VLG
Magnitude: 1.50 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

A swath of hail as large as ping pong ball size fell from west Lubbock to the Lubbock airport.  Damage was generally minor and consisted of dented vehicles.

Thunderstorm Wind in LUBBOCK, TEXAS
From 28-MAY-15 12:40:00 to 28-MAY-15 12:40:00 (CST-6)
Location: DOUD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Estimated wind gust.