As the day progressed through the Panhandles, an upper level trough over eastern New Mexico was moving further towards the western Panhandles and as a result, upper level dynamics with a SW-NE 250 hPa jet streak was setting up over SE New Mexico and the Texas south Plains as we went into the over night hours into the 10th. This set up good upper level dynamics in-conjunction with a good low level veering SE-SW veering profile advecting moisture into the region. With CAPE between 1000-2000 J/kg and LCL heights around 500m across the central and eastern Panhandles, the dynamics were there for supercells and the possibility of tornadoes. From the evening of the 9th through the very early morning hours of the 10th, several large hail and wind reports were confined mainly to the TX but also a few in the OK Panhandle. Two EF-1 tornadoes also occurred in the TX Panhandle from the same supercell early morning on the 10th.

Hail in DEAF SMITH, TEXAS
From 09-MAY-17 19:12:00 to 09-MAY-17 19:12:00 (CST-6)
Location: BOOTLEG
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in DEAF SMITH, TEXAS
From 09-MAY-17 19:03:00 to 09-MAY-17 19:03:00 (CST-6)
Location: BOOTLEG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ARMSTRONG, TEXAS
From 10-MAY-17 02:11:00 to 10-MAY-17 02:11:00 (CST-6)
Location: CLAUDE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Late report. Time estimated by radar.

Hail in DONLEY, TEXAS
From 10-MAY-17 02:36:00 to 10-MAY-17 02:36:00 (CST-6)
Location: ASHTOLA
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Late report of hail ranging from golf ball to slightly larger than baseballs in size.

Hail in ARMSTRONG, TEXAS
From 10-MAY-17 03:17:00 to 10-MAY-17 03:17:00 (CST-6)
Location: WASHBURN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Late report. Half Dollar size hail reported.

Hail in GRAY, TEXAS
From 10-MAY-17 02:49:00 to 10-MAY-17 02:49:00 (CST-6)
Location: ALANREED
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Late report from Facebook. Time estimated by radar.

Tornado in ARMSTRONG, TEXAS
From 10-MAY-17 02:27:00 to 10-MAY-17 02:36:00 (CST-6)
Location: GOODNIGHT
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Tornado started 4 ENE of Goodnight at the intersection of County Road J and County Road 30. It overturned a section of center pivot irrigation before doing more significant tree damage at a ranch 7 ENE of Goodnight. Two downed power poles along with uprooted and snapped trees were the most noticeable damage. Some tree debris was deposited 100-200 yards NE of the original location.

Tornado in GRAY, TEXAS
From 10-MAY-17 03:01:00 to 10-MAY-17 03:09:00 (CST-6)
Location: ALANREED
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Tornado started in open field WSW of Lake McClellan, TX in Gray County. Moving NE, the tornado peaked in intensity as it approached and moved parallel to the lake and through the north side of the Lake McClellan campground. Peak damage included numerous large tree branches and several trees uprooted or snapped. A few recreational vehicles in the campground also sustained some damages. The tornado dissipated ENE of Lake McClellan just north of McClellan Creek.