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.

Hail in CIMARRON, OKLAHOMA
From 30-MAY-21 17:00:00 to 30-MAY-21 17:00:00 (CST-6)
Location: FELT
Magnitude: 1.25 
Reported by: Storm Chaser

Hail in CIMARRON, OKLAHOMA
From 30-MAY-21 17:27:00 to 30-MAY-21 17:27:00 (CST-6)
Location: BOISE CITY
Magnitude: 1.25 
Reported by: Storm Chaser

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 16:34:00 to 30-MAY-21 16:35:00 (CST-6)
Location: FELT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Multiple storm chasers reported and recorded video of a very
brief tornado a couple miles west of Felt. The tornado remained in
open grassland and did not encounter any damage indicators. Path
was estimated based on reports and video.

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 17:02:00 to 30-MAY-21 17:15:00 (CST-6)
Location: FELT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Multiple storm chasers reported and recorded video of a tornado
around 17 miles southwest of Boise City. This tornado began at the
same time as one to the north within the original circulation.
The tornado remained in open grassland and did not encounter any
damage indicators.

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 17:44:00 to 30-MAY-21 17:45:00 (CST-6)
Location: BOISE CITY
Tornado F-scale: EFU
Reported by: NWS Storm Survey

Multiple storm chasers reported and recorded video of a brief
tornado around 10 miles south of Boise City. The tornado remained
in open grassland and did not encounter any damage indicators.

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 16:39:00 to 30-MAY-21 16:40:00 (CST-6)
Location: FELT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Multiple storm chasers reported and recorded video of a very
brief tornado a couple miles west of Felt. The tornado remained in
open grassland and did not encounter any damage indicators. Path
was estimated based on reports and video.

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 16:43:00 to 30-MAY-21 16:44:00 (CST-6)
Location: FELT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Multiple storm chasers reported and recorded video of a very
brief tornado a couple miles west of Felt. The tornado remained in
open grassland and did not encounter any damage indicators. Path
was estimated based on reports and video.

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 16:56:00 to 30-MAY-21 16:58:00 (CST-6)
Location: FELT
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Multiple storm chasers reported and recorded video of a brief
cone tornado just southeast of Felt. The tornado remained in open
grassland and did not encounter any damage indicators.

Tornado in CIMARRON, OKLAHOMA
From 30-MAY-21 17:02:00 to 30-MAY-21 17:03:00 (CST-6)
Location: FELT
Tornado F-scale: EFU
Property damage: 0.00K
Reported by: Storm Chaser

Multiple storm chasers reported and recorded video of a very
brief tornado a around 4 miles northeast of Felt. This tornado
was within the original storm mesocyclone near Highway 412. The
storm briefly had two tornadoes as a new tornado developed on the
south side of the storm and became the dominant circulation. The
tornado remained in open grassland and did not encounter any
damage indicators. Path was estimated based on reports and video.

Hail in CIMARRON, OKLAHOMA
From 30-MAY-21 16:41:00 to 30-MAY-21 16:41:00 (CST-6)
Location: FELT
Magnitude: 1.75 
Reported by: Storm Chaser