An upper level disturbance moved across the region above southeast winds at the surface, which brought increasing moisture to the area.  Daytime heating lead to strong instability and this combined with moderate shear brought the development of severe storms to the Upper Trans Pecos.

Tornado in REEVES, TEXAS
From 18-MAY-15 16:25:00 to 18-MAY-15 16:27:00 (CST-6)
Location: TOYAH LAKE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A thunderstorm moved across Reeves County and produced a tornado near Toyah Lake.  The tornado was observed by a storm chaser and lasted about 2 minutes.  It was located 4 miles east of Toyah Lake and no damage was reported.  The path length and width were both estimated.  Due to no damage being reported, it was rated as an EF-0.

Tornado in REEVES, TEXAS
From 18-MAY-15 16:53:00 to 18-MAY-15 16:58:00 (CST-6)
Location: TOYAH LAKE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm moved across Reeves County and produced a tornado south of Pecos.  The tornado was seen by a trained spotter 11 miles south of Pecos between Highway 285 and Farm to Market Road 1450. It was on the ground for approximately 5 minutes and no damage was reported.  The path length and width were both estimated.  Due to no damage being reported, it was rated as an EF-0.

Hail in REEVES, TEXAS
From 18-MAY-15 15:45:00 to 18-MAY-15 15:50:00 (CST-6)
Location: TOYAH LAKE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in REEVES, TEXAS
From 18-MAY-15 15:45:00 to 18-MAY-15 15:50:00 (CST-6)
Location: PECOS
Magnitude: 1.00 
Reported by: NWS Employee

Hail in REEVES, TEXAS
From 18-MAY-15 16:01:00 to 18-MAY-15 16:06:00 (CST-6)
Location: PECOS
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in REEVES, TEXAS
From 18-MAY-15 16:11:00 to 18-MAY-15 16:16:00 (CST-6)
Location: PECOS
Magnitude: 1.75 
Reported by: Law Enforcement

Hail in REEVES, TEXAS
From 18-MAY-15 16:17:00 to 18-MAY-15 16:22:00 (CST-6)
Location: PECOS
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in REEVES, TEXAS
From 18-MAY-15 16:17:00 to 18-MAY-15 16:27:00 (CST-6)
Location: PECOS
Magnitude: 2.00 
Reported by: NWS Employee

A thunderstorm moved across Reeves County and produced two inch hail southwest of Pecos.  The hail was covering the ground.

Hail in REEVES, TEXAS
From 18-MAY-15 16:45:00 to 18-MAY-15 17:00:00 (CST-6)
Location: TOYAH LAKE
Magnitude: 1.00 
Reported by: NWS Employee

A thunderstorm moved across Reeves County and produced one inch hail southeast of Pecos.  The hail was reported to be up to one foot deep covering US 285 with near zero visibility.

Hail in PECOS, TEXAS
From 18-MAY-15 17:55:00 to 18-MAY-15 18:00:00 (CST-6)
Location: COYANOSA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in PECOS, TEXAS
From 18-MAY-15 18:25:00 to 18-MAY-15 18:30:00 (CST-6)
Location: COYANOSA
Magnitude: 1.75 
Reported by: Public

Hail in UPTON, TEXAS
From 18-MAY-15 22:47:00 to 18-MAY-15 22:52:00 (CST-6)
Location: MC CAMEY
Magnitude: 1.75 
Reported by: Law Enforcement

Thunderstorm Wind in REAGAN, TEXAS
From 19-MAY-15 00:47:00 to 19-MAY-15 00:48:00 (CST-6)
Location: BIG LAKE
Magnitude: 54.00 MG
Reported by: Mesonet

A thunderstorm moved across Reagan County and produced a 62 mph wind gust as recorded by the mesonet.

Thunderstorm Wind in REAGAN, TEXAS
From 19-MAY-15 00:50:00 to 19-MAY-15 00:51:00 (CST-6)
Location: BIG LAKE
Magnitude: 52.00 EG
Reported by: Public

A thunderstorm moved across Reagan County and produced a 60 mph wind gust at the Pilot Travel Center in Big Lake.

Thunderstorm Wind in PECOS, TEXAS
From 18-MAY-15 19:41:00 to 18-MAY-15 19:42:00 (CST-6)
Location: COYANOSA
Magnitude: 78.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm moved across Pecos County and produced wind damage near Coyanosa.  A storm damage survey was conducted in the area and it was determined that the damage was caused by limited straight-line winds.  Telephone poles were snapped at a few locations and were all blown down facing south.  Based on the damage, the winds were estimated to be 80 to 100 mph.  Hail drifts were also reported with this storm.  The cost of damage is a very rough estimate.

Flash Flood in PECOS, TEXAS
From 18-MAY-15 19:41:00 to 18-MAY-15 21:00:00 (CST-6)
Location: COYANOSA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain moved across Pecos County and produced a flash flood near Coyanosa.  Several cars were reported to have swept off the road.  There was a high water rescue by the Pecos County Sheriff's Department of a woman and two children in a car but no injuries were reported.  The flood gauge on the road showed that the water was four feet deep.  The Texas Tech Mesonet site located about two miles north of Coyanosa reported more than four inches of rain during the evening.  The cost of damage is a very rough estimate.

Heavy Rain in PECOS, TEXAS
From 18-MAY-15 22:00:00 to 18-MAY-15 22:30:00 (CST-6)
Location: COYANOSA
Reported by: Mesonet

Heavy rain fell north of Coyanosa in Pecos County.  Three inches of rain were recorded by the mesonet in 30 minutes and 4.15 inches total were recorded.

Heavy Rain in UPTON, TEXAS
From 18-MAY-15 23:30:00 to 18-MAY-15 23:55:00 (CST-6)
Location: MC CAMEY
Reported by: Social Media

Heavy rain fell in McCamey and three inches were recorded.

Thunderstorm Wind in REAGAN, TEXAS
From 19-MAY-15 00:50:00 to 19-MAY-15 00:51:00 (CST-6)
Location: BEST
Magnitude: 51.00 MG
Reported by: Mesonet

A thunderstorm moved across Reagan County and produced a 59 mph wind gust near St. Lawrence at the mesonet site.

Thunderstorm Wind in WARD, TEXAS
From 18-MAY-15 19:28:00 to 18-MAY-15 19:29:00 (CST-6)
Location: GRANDFALLS
Magnitude: 56.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

A thunderstorm moved across Ward County and produced wind damage in Grandfalls.  The winds caused a 20 foot tree to split in half.  The cost of damage is a very rough estimate.

Hail in PECOS, TEXAS
From 18-MAY-15 17:59:00 to 18-MAY-15 18:04:00 (CST-6)
Location: COYANOSA
Magnitude: 1.00 
Reported by: Trained Spotter