A slow moving upper level storm system contributed to development of severe storms for a third consecutive day as it moved east to the Four Corners region by May 17th. With the system drawing nearer, wind shear and instability increased from what occurred with the previous days events and so did storm organization and strength. A line of thunderstorms that developed near a surface trough in New Mexico moved into the Oklahoma and Texas Panhandles in the late afternoon and evening hours. Several storms produced severe hail and wind especially across the southern Texas Panhandle. A few very powerful storms produced hail in excess of 2 inches in diameter and there was also a breif, weak tornado reported in open country across the southwest Texas Pahandle.

Hail in POTTER, TEXAS
From 17-MAY-21 19:00:00 to 17-MAY-21 19:00:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 1.25 
Reported by: Public

Thunderstorm Wind in POTTER, TEXAS
From 17-MAY-21 18:54:00 to 17-MAY-21 18:54:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 61.00 EG
Reported by: Public

Broken power poles were reported along with tree limbs around 3 in diameter were broken off of trees.

Thunderstorm Wind in RANDALL, TEXAS
From 17-MAY-21 18:26:00 to 17-MAY-21 18:26:00 (CST-6)
Location: UMBARGER
Magnitude: 51.00 MG
Reported by: Mesonet

Thunderstorm Wind in POTTER, TEXAS
From 17-MAY-21 18:54:00 to 17-MAY-21 18:54:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 56.00 MG
Reported by: ASOS

Thunderstorm Wind in ARMSTRONG, TEXAS
From 17-MAY-21 19:39:00 to 17-MAY-21 19:39:00 (CST-6)
Location: GOODNIGHT
Magnitude: 52.00 MG
Reported by: Mesonet

Thunderstorm Wind in HUTCHINSON, TEXAS
From 17-MAY-21 20:03:00 to 17-MAY-21 20:03:00 (CST-6)
Location: STINNETT
Magnitude: 59.00 MG
Reported by: Mesonet

Flash Flood in RANDALL, TEXAS
From 17-MAY-21 18:50:00 to 17-MAY-21 19:30:00 (CST-6)
Location: PALO DURO CANYON STATE PARK
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Significant flooding had occurred in the park.  Many of the trail bridges located in the park over creeks were  washed out and lost. A rockslide caused by the flooding had blocked the main road down into the canyon.

Tornado in OLDHAM, TEXAS
From 17-MAY-21 17:35:00 to 17-MAY-21 17:39:00 (CST-6)
Location: BOYS RANCH
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado touched down in very rural portions of Oldham county
and remained in open prairie grassland with no structures or
trees hit and no damage reported. The entire life cycle of the
tornado was documented by a local storm spotter.

Hail in ROBERTS, TEXAS
From 17-MAY-21 16:14:00 to 17-MAY-21 16:14:00 (CST-6)
Location: CODMAN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in OLDHAM, TEXAS
From 17-MAY-21 18:22:00 to 17-MAY-21 18:22:00 (CST-6)
Location: WILDORADO
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in RANDALL, TEXAS
From 17-MAY-21 18:25:00 to 17-MAY-21 18:25:00 (CST-6)
Location: CANYON
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in RANDALL, TEXAS
From 17-MAY-21 18:25:00 to 17-MAY-21 18:25:00 (CST-6)
Location: PALO DURO CANYON STATE PARK
Magnitude: 2.75 
Reported by: Public

Hail damaged some vehicles and campers, mainly on the south side of the park. Some  hikers reportedly had some minor bumps and  bruises from the hail.

Hail in OLDHAM, TEXAS
From 17-MAY-21 18:26:00 to 17-MAY-21 18:26:00 (CST-6)
Location: BOYS RANCH
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in OLDHAM, TEXAS
From 17-MAY-21 18:29:00 to 17-MAY-21 18:29:00 (CST-6)
Location: WILDORADO
Magnitude: 1.75 
Reported by: Public

Hail in RANDALL, TEXAS
From 17-MAY-21 18:29:00 to 17-MAY-21 18:29:00 (CST-6)
Location: PALO DURO CANYON STATE PARK
Magnitude: 1.25 
Reported by: Public

Hail in OLDHAM, TEXAS
From 17-MAY-21 18:36:00 to 17-MAY-21 18:36:00 (CST-6)
Location: BOYS RANCH
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in RANDALL, TEXAS
From 17-MAY-21 18:47:00 to 17-MAY-21 18:47:00 (CST-6)
Location: LAKE TANGLEWOOD
Magnitude: 2.00 
Reported by: Public

Hail in POTTER, TEXAS
From 17-MAY-21 18:54:00 to 17-MAY-21 18:54:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 1.25 
Reported by: Public