Persistent low level winds out of the east brought substantial moisture to the region and contributed to severe supercell thunderstorm development as an upper level disturbance approached from the southwest. Large hail, severe wind gusts, flooding rains and tornadoes all occurred on this day. An nearly stationary outflow boundary provided strong turning in the low level wind fields that created additional wind shear which was instrumental in development of several tornadoes with the supercells that tracked near or along the boundary. A total of 13 tornadoes were confirmed in what turned out to be the highest tornado producing event of the season, although most of these were very short lived, weak, and produced little damage and/or impact. Seven tornadoes occurred in Cimarron County, mainly in the vicinity of Felt, all of which occurred over open land but were well documented by chasers. Six tornadoes occurred in Dallam and Sherman Counties, all of which were rated EF-0 or were unable to be rated due to a lack of damage indicators. Additionally, heavy rainfall occurred in many locations given the large amount of moisture in place, with flash flooding occurring in Amarillo, Canyon, and Wellington. Some locations received more than 4 inches of rainfall.

Flash Flood in POTTER, TEXAS
From 30-MAY-21 22:35:00 to 30-MAY-21 22:53:00 (CST-6)
Location: BUSHLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in RANDALL, TEXAS
From 30-MAY-21 22:34:00 to 30-MAY-21 22:54:00 (CST-6)
Location: AMARILLO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Street flooding reported on South Coulter near Hollywood Road construction zones.

Hail in SHERMAN, TEXAS
From 30-MAY-21 18:41:00 to 30-MAY-21 18:41:00 (CST-6)
Location: LAUTZ
Magnitude: 1.75 
Reported by: Storm Chaser

Hail in SHERMAN, TEXAS
From 30-MAY-21 19:13:00 to 30-MAY-21 19:13:00 (CST-6)
Location: TEXHOMA
Magnitude: 1.00 
Reported by: Storm Chaser

Hail in RANDALL, TEXAS
From 30-MAY-21 22:48:00 to 30-MAY-21 22:48:00 (CST-6)
Location: AMARILLO
Magnitude: 0.75 
Reported by: Public

Tornado in DALLAM, TEXAS
From 30-MAY-21 17:19:00 to 30-MAY-21 17:20:00 (CST-6)
Location: CONLEN
Tornado F-scale: EFU
Reported by: NWS Storm Survey

The tornado was documented via pictures and video by multiple
storm chasers, including NWS employees. It appeared weak, but
remained in open country grasslands and encountered no damage
indicators. The path information was estimated based on reports
and radar signatures.

Tornado in DALLAM, TEXAS
From 30-MAY-21 17:46:00 to 30-MAY-21 17:48:00 (CST-6)
Location: CONLEN
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado was documented via pictures and video by multiple
storm chasers, including NWS employees, and was also witnessed by
an Emergency Manager. It remained in open country grassland and
encountered no damage indicators. Path was estimated based on
reports and radar signatures.

Tornado in SHERMAN, TEXAS
From 30-MAY-21 18:30:00 to 30-MAY-21 18:34:00 (CST-6)
Location: LAUTZ
Tornado F-scale: EFU
Reported by: Storm Chaser

The tornado was documented via pictures and video by multiple
storm chasers and local media. It remained in open country
grassland and encountered no damage indicators. Path was
estimated based on reports and radar signatures.

Tornado in DALLAM, TEXAS
From 30-MAY-21 17:13:00 to 30-MAY-21 17:16:00 (CST-6)
Location: CHAMBERLAIN
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado was documented via pictures and video by multiple
storm chasers, including NWS employees. It appeared weak, but
remained in open country grassland and encountered no damage
indicators. Path was estimated based on reports and radar
signatures.

Tornado in DALLAM, TEXAS
From 30-MAY-21 17:21:00 to 30-MAY-21 17:22:00 (CST-6)
Location: CONLEN
Tornado F-scale: EFU
Reported by: NWS Storm Survey

The tornado was documented via pictures and video by multiple
storm chasers, including NWS employees. It appeared weak, but
remained in open country grassland and encountered no damage
indicators. Path was estimated based on reports and radar
signatures.

Tornado in SHERMAN, TEXAS
From 30-MAY-21 18:43:00 to 30-MAY-21 18:53:00 (CST-6)
Location: LAUTZ
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Multiple storm chasers recorded a large tornado crossing Highway
15 east of Stratford around 750 pm CDT. The tornado did not
damage the power lines along the highway and this was the basis
for the EF0 rating. Otherwise the tornado stayed in open country
grassland and farmlands and survey team found no damage anywhere
along the path which was estimated based on video and radar
evidence.