Mid to upper level northwesterly flow helped to move storms into the Panhandles region. With SBCAPE of 3000-4000 J/Kg in the western TX Panhandles, in-conjunction with 30-40 kts of effective shear, an established 850-700 surface trough over eastern NM advecting surface moisture northward downstream of its axis, along with around 200 m2/s2 of effective helicity provided an initial environment of supercell development on the onset of the convection before an MCS eventually developed and moved SE across the remainder of the TX Panhandle. Some cells across the central TX Panhandle did develop before being part of the southward moving MCS from the western TX Panhandle which one cell did produce a short lived weak tornado. Overall, several reports early on of large hail and damaging winds were reported, especially across the western TX Panhandle.

Thunderstorm Wind in DALLAM, TEXAS
From 13-AUG-17 16:26:00 to 13-AUG-17 16:26:00 (CST-6)
Location: TEXLINE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gust of 60 MPH.

Hail in DALLAM, TEXAS
From 13-AUG-17 16:44:00 to 13-AUG-17 16:44:00 (CST-6)
Location: TEXLINE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DALLAM, TEXAS
From 13-AUG-17 17:07:00 to 13-AUG-17 17:07:00 (CST-6)
Location: WARE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated wind gust of 70 MPH.

Thunderstorm Wind in DALLAM, TEXAS
From 13-AUG-17 17:18:00 to 13-AUG-17 17:18:00 (CST-6)
Location: DALHART
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Five power poles down in a row.

Thunderstorm Wind in HARTLEY, TEXAS
From 13-AUG-17 17:24:00 to 13-AUG-17 17:24:00 (CST-6)
Location: DALHART
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tree limbs down reported in Dalhart.

Thunderstorm Wind in HARTLEY, TEXAS
From 13-AUG-17 17:25:00 to 13-AUG-17 17:25:00 (CST-6)
Location: (DHT)DALHART MUNI AR
Magnitude: 61.00 EG
Reported by: Emergency Manager

Extensive damage to hangars and airplanes were flipped over.

Thunderstorm Wind in HARTLEY, TEXAS
From 13-AUG-17 17:25:00 to 13-AUG-17 17:25:00 (CST-6)
Location: (DHT)DALHART MUNI AR
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in HARTLEY, TEXAS
From 13-AUG-17 17:48:00 to 13-AUG-17 17:48:00 (CST-6)
Location: HARTLEY
Magnitude: 56.00 EG
Reported by: Public

Wind damage at a gas station in the town of Hartley.

Thunderstorm Wind in OLDHAM, TEXAS
From 13-AUG-17 17:48:00 to 13-AUG-17 17:48:00 (CST-6)
Location: BOYS RANCH
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MOORE, TEXAS
From 13-AUG-17 17:53:00 to 13-AUG-17 17:53:00 (CST-6)
Location: DUMAS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail the size of quarters to half dollars falling with moderate to heavy rain and winds 20 to 40 mph.

Hail in MOORE, TEXAS
From 13-AUG-17 18:10:00 to 13-AUG-17 18:10:00 (CST-6)
Location: DUMAS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Picture of 2 inch hail submitted from social media 4 miles north of Dumas.

Tornado in POTTER, TEXAS
From 13-AUG-17 19:00:00 to 13-AUG-17 19:01:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Brief tornado lasted about one minute.

Thunderstorm Wind in POTTER, TEXAS
From 13-AUG-17 19:11:00 to 13-AUG-17 19:11:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in POTTER, TEXAS
From 13-AUG-17 19:12:00 to 13-AUG-17 19:12:00 (CST-6)
Location: (AMA)AMARILLO INTL A
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in DEAF SMITH, TEXAS
From 13-AUG-17 20:25:00 to 13-AUG-17 20:25:00 (CST-6)
Location: HEREFORD
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DALLAM, TEXAS
From 13-AUG-17 18:20:00 to 13-AUG-17 18:32:00 (CST-6)
Location: DALHART
Magnitude: 96.00 EG
Reported by: NWS Storm Survey

A significant downburst wind event occurred west and southwest of Dalhart, TX on Sunday evening. The downburst was associated with an RFD of a supercell thunderstorm. Damage from the downburst was initially observed at the Twisted Elms Golf Course were several trees were uprooted and many large branches were downed, including some onto power lines. Damage at the golf course was estimated at 75-85 MPH. The damage continued to the southeast were several power poles were blown down. Severe straight line damaged peaked at the airport where a 74 MPH wind was observed with even some of NWS ASOS equipment was damaged afterwards by flying debris from airport hangers up to half a mile away. Several small planes and a pop-up camper were flipped and thrown up to 50 yards. Damage at the airport was estimated to be from 100 to 110 MPH winds, which is equivalent of a high end EF-1 tornado.