On the afternoon of the 14th, isolated thunderstorms developed along a dryline over far east-central New Mexico and moved into Parmer and Bailey Counties. Mixed layer CAPE reached values on the order of 3000 J/kg by late afternoon, with low level wind shear amplifying by early evening. One of these storms evolved into a slow moving supercell that persisted for almost nine hours and produced at least seven known tornadoes, including an exceptionally large EF-3 tornado near Dimmitt (Castro County) that damaged some homes and destroyed several structures. It is possible that satellite tornadoes accompanied the larger tornado at times, but no definitive evidence to this point was available. After remaining in Castro County for nearly four hours and producing flash flooding north and northwest of Dimmitt, the supercell storm finally accelerated southeast before dissipating over Motley County around 0100 CST on the 15th. A plethora of video evidence was available from numerous storm chasers observing this supercell.

Thunderstorm Wind in CASTRO, TEXAS
From 14-APR-17 18:01:00 to 14-APR-17 18:01:00 (CST-6)
Location: DIMMITT
Magnitude: 65.00 EG
Property damage: 9.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser video showed several power poles being blown down by inflow winds into a tornado at the intersection of State Highway 86 and County Road 510A.

Flash Flood in CASTRO, TEXAS
From 14-APR-17 20:00:00 to 14-APR-17 23:00:00 (CST-6)
Location: SUMMERFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Very heavy rainfall trained over a large area from northwest of Dimmitt to northeast of Dimmitt. Farm to Market Road 2397 between Farm to Market Road 1055 and US Highway 385 was closed due to high water. A storm survey the next day revealed water was still running over the roadway at some spots. Farm to Market Road 2397 east of US Highway 385 continued to be flooded the next day as well. A pivot irrigation site near the intersection of Farm to Market Roads 2397 and 1055 recorded 4.88 inches of rainfall.

Tornado in PARMER, TEXAS
From 14-APR-17 16:59:00 to 14-APR-17 17:04:00 (CST-6)
Location: LAZBUDDIE
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tornado was initially spotted northeast of Lazbuddie near the Parmer/Castro County line at 1659 CST, before continuing east into west-central Castro County. No evidence of damage accompanied this tornado.

Tornado in CASTRO, TEXAS
From 14-APR-17 17:04:00 to 14-APR-17 17:07:00 (CST-6)
Location: DODD
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This is the continuation of the prior tornado in Parmer County. This tornado tracked east into west-central Castro County where it dissipated around 1707 CST, about 12 miles west-southwest of Dimmitt. No evidence of damage accompanied this tornado.

Tornado in CASTRO, TEXAS
From 14-APR-17 17:19:00 to 14-APR-17 17:20:00 (CST-6)
Location: DIMMITT
Tornado F-scale: EF0
Property damage: 9.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser observed a brief tornado touchdown just south of the intersection of State Highway 86 and Farm to Market road 1524. Several power poles were downed along Farm to Market road 1524.

Tornado in CASTRO, TEXAS
From 14-APR-17 18:45:00 to 14-APR-17 18:47:00 (CST-6)
Location: DIMMITT MUNI ARPT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser observed a brief tornado a few miles north of Dimmitt.  No damage was evident.

Tornado in CASTRO, TEXAS
From 14-APR-17 19:04:00 to 14-APR-17 19:04:00 (CST-6)
Location: DIMMITT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser observed a brief rope tornado just north of State Highway 86 about six miles west of Dimmitt.  No damage was reported.

Thunderstorm Wind in CASTRO, TEXAS
From 14-APR-17 18:20:00 to 14-APR-17 18:25:00 (CST-6)
Location: DIMMITT
Magnitude: 60.00 EG
Property damage: 42.00K
Crop damage: 0.00K
Reported by: Utility Company

Touchstone Energy reported that 14 power poles were damaged on the west and northwest side of Dimmitt.  The damage was likely from severe inflow winds.  The time of this event was estimated from adjacent severe wind reports.

Tornado in CASTRO, TEXAS
From 14-APR-17 17:27:00 to 14-APR-17 17:36:00 (CST-6)
Location: DIMMITT
Tornado F-scale: EF0
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Several storm chasers observed a tornado that began around the intersection of Farm to Market Road 1055 and County Road 618 and moved east for approximately two miles. Video evidence indicated this tornado moved over a feed lot and then into an open field. Several power lines were downed along Farm to Market Road 1055 and County Road 510.

Tornado in CASTRO, TEXAS
From 14-APR-17 17:36:00 to 14-APR-17 18:04:00 (CST-6)
Location: DIMMITT MUNI ARPT
Tornado F-scale: EF3
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

An exceptionally large and significant tornado affected areas west of Dimmitt in Castro County. Along with video provided by storm spotters, a NWS storm survey team determined this tornado began just south of Highway 86 about 4 miles southwest of Dimmitt, before quickly assuming a very large wedge formation while moving slowly northeast. This tornado then turned north and northwest, before ending around the intersection of County Roads 511 and 511A. A satellite tornado reportedly accompanied this large tornado, however multiple video sources revealed this was only a satellite funnel. The most significant damage observed by the NWS survey team was found near the intersection of Farm to Market Road 2392 and County Road 510A. Here, a metal systems building was completely destroyed with its remnants lofted several hundred feet to the northwest. Several nearby homes sustained damage up to EF-2 intensity, with some residents riding out the tornado in their shelters. Fortunately, no injuries or fatalities accompanied this 1.1 mile wide tornado. Elsewhere along this large tornado's path, numerous power poles and center pivot irrigation systems were destroyed.

Thunderstorm Wind in CASTRO, TEXAS
From 14-APR-17 18:50:00 to 14-APR-17 18:50:00 (CST-6)
Location: DIMMITT
Magnitude: 52.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

A Texas Tech University West Texas mesonet recorded a thunderstorm inflow wind gust to 60 mph. Furthermore, wind-driven hail damaged two anemometers on this mesonet.

Hail in CASTRO, TEXAS
From 14-APR-17 20:20:00 to 14-APR-17 20:25:00 (CST-6)
Location: DIMMITT
Magnitude: 2.80 
Crop damage: 0.00K
Reported by: COOP Observer

A NWS cooperative weather observer and a storm chaser reported hail a bit larger than baseball size just north of Dimmitt.  Hail damage in this area was not known.

Hail in CASTRO, TEXAS
From 14-APR-17 21:35:00 to 14-APR-17 21:35:00 (CST-6)
Location: HART
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A NWS cooperative weather observer reported quarter size hail in Hart. No damage was reported.

Thunderstorm Wind in CASTRO, TEXAS
From 14-APR-17 21:50:00 to 14-APR-17 21:55:00 (CST-6)
Location: HART
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A Texas Tech University West Texas mesonet station measured a wind gust to 80 mph.

Hail in PARMER, TEXAS
From 14-APR-17 15:14:00 to 14-APR-17 15:26:00 (CST-6)
Location: BOVINA
Magnitude: 1.85 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser measured hail slightly larger than golf ball size along US Highway 60 southwest and northeast of Bovina. No damage was reported.

Hail in PARMER, TEXAS
From 14-APR-17 15:54:00 to 14-APR-17 16:14:00 (CST-6)
Location: BOVINA
Magnitude: 2.75 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser reported hail up to baseball size along US Highway 60 northeast of Bovina.  Some storm chasers and a law enforcement vehicle received damage to their windshields.

Hail in PARMER, TEXAS
From 14-APR-17 16:34:00 to 14-APR-17 16:34:00 (CST-6)
Location: HUB
Magnitude: 2.80 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser measured hail on the ground slightly larger than baseball size. No damage was reported.

Hail in CASTRO, TEXAS
From 14-APR-17 19:39:00 to 14-APR-17 19:39:00 (CST-6)
Location: DIMMITT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Local broadcast media relayed a report of quarter size hail in Dimmitt.

Hail in CASTRO, TEXAS
From 14-APR-17 20:55:00 to 14-APR-17 20:55:00 (CST-6)
Location: NAZARETH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported in Nazareth. No damage was reported.

Hail in HALE, TEXAS
From 14-APR-17 23:12:00 to 14-APR-17 23:12:00 (CST-6)
Location: PLAINVIEW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser reported golf ball size hail in Plainview. No damage was reported.

Tornado in SWISHER, TEXAS
From 14-APR-17 22:25:00 to 14-APR-17 22:32:00 (CST-6)
Location: KRESS
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser recorded a tornado at night northwest of Edmonson. The tornado was backlit by frequent lightning. No damage was reported from this tornado. Radar indicated the parent circulation to this tornado behaved very erratically; initially moving northeast, then stalling for several minutes, then moving slowly southeast while dissipating.