In advance of a diffuse dryline located from near Tulia south to Brownfield, moderate instability developed this afternoon underneath weak capping and modest mid-level winds.  Thunderstorms had little problem initiating during the heat of the day and several of these became supercells thanks to sufficient directional shear.  Initially, the first supercell developed northwest of Silverton and went on to produce very large hail, flooding and at least one funnel.  By late afternoon, another prolific supercell erupted farther southwest near Cotton Center and for the next 1.5 hours remained over southern Hale County producing giant hail to softball size, torrential rains estimated up to seven inches, and even multiple funnel clouds.  From sunset through late evening, additional supercell storms developed from near Reese Center north to Olton and Memphis; many of which were proficient with large hail and flooding rainfall.  Significant areal flooding enveloped a swath of southern Hale County where many roads were inundated by water; some of which remained closed through the late morning hours of the 28th.  Similar flooding was reported in Memphis during the overnight hours including water of a few inches deep rushing into some buildings.

Thunderstorm Wind in HALE, TEXAS
From 27-MAY-15 21:55:00 to 27-MAY-15 21:55:00 (CST-6)
Location: ABERNATHY 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.

Hail in HALE, TEXAS
From 27-MAY-15 21:12:00 to 27-MAY-15 21:12:00 (CST-6)
Location: ABERNATHY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS employee reported quarter size hail on Farm-to-Market Road 2528 about three miles north of the town of County Line.  No damage occurred.

Flood in HALL, TEXAS
From 27-MAY-15 21:30:00 to 28-MAY-15 04:00:00 (CST-6)
Location: MEMPHIS
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in HALE, TEXAS
From 27-MAY-15 17:01:00 to 27-MAY-15 17:53:00 (CST-6)
Location: HALE CENTER
Magnitude: 4.50 
Property damage: 350.00K
Reported by: Law Enforcement

A nearly stationary supercell produced a severe hail swath ranging in size from quarters to softballs.  Several dozen vehicles traveling along Interstate 27 between Abernathy and the Hale Center rest stop suffered varying degrees of damage; the worst of which involved losing nearly all windows.

Hail in HOCKLEY, TEXAS
From 27-MAY-15 20:20:00 to 27-MAY-15 20:20:00 (CST-6)
Location: ANTON
Magnitude: 2.75 
Reported by: Trained Spotter

An off-duty weather observer reported copious amounts of small hail covering his lawn with a few hailstones estimated up to baseball size.  Damage was not known.

Flood in HALE, TEXAS
From 27-MAY-15 17:30:00 to 28-MAY-15 09:00:00 (CST-6)
Location: COTTON CENTER
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in HALL, TEXAS
From 27-MAY-15 21:03:00 to 27-MAY-15 21:20:00 (CST-6)
Location: MEMPHIS
Magnitude: 1.75 
Property damage: 200.00K
Reported by: Law Enforcement

Hail ranging from quarter to golf ball size fell in Memphis for about 20 minutes.  Damage consisted primarily of dented vehicles.

Hail in BRISCOE, TEXAS
From 27-MAY-15 16:26:00 to 27-MAY-15 16:26:00 (CST-6)
Location: SILVERTON
Magnitude: 2.25 
Reported by: NWS Employee

An off-duty NWS employee estimated hail just over two inches in diameter on the ground, but not falling at the time.  Damage was unknown.