A significant severe weather event occurred across the Tri-State Region on the evening of August 11th, 2019. Widespread damaging winds, heavy rainfall, and flash flooding was reported to NWS Goodland. In addition, a few tornadoes occurred along with some large hail. The event began with a couple supercell thunderstorms over Yuma County Colorado and Cheyenne County Kansas. These are the primary storms that produced the large hail and tornadoes. The event evolved with several lines of storms forming, including a large line of storms that moved across Cheyenne, Rawlins, Decatur, Norton, Sherman, Thomas, Sheridan, and Graham counties in northwest Kansas. A second line of storms produced wind damage in Cheyenne County Colorado. These storms later produced heavy rain across Wallace, Logan, and Gove counties in Northwest Kansas.

Tornado in YUMA, COLORADO
From 11-AUG-19 15:59:00 to 11-AUG-19 16:01:00 (MST-7)
Location: ROBB
Tornado F-scale: EF1
Property damage: 70.00K
Reported by: NWS Storm Survey

A brief tornado occurred northwest of Wray, CO, or west-southwest of Wauneta, CO. This tornado uprooted trees and snapped several large branches at a residence. The tornado was captured by photograph and forwarded to NWS Goodland by the Yuma County Emergency Manager.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 16:30:00 to 11-AUG-19 16:30:00 (MST-7)
Location: WRAY MUNI ARPT
Magnitude: 78.00 MG
Property damage: 50.00K
Reported by: NWS Storm Survey

NWS Storm Survey confirmed straight line wind damage north of Wray, CO. At this location, damage consisted of a few trees snapped, metal roofing blown off a farm structure, and power poles leaning.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 16:37:00 to 11-AUG-19 16:42:00 (MST-7)
Location: WRAY MUNI ARPT
Magnitude: 87.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS Storm Survey confirmed straight line wind damage swath along County Road KK north of Wray, CO. Damage consisted of trees snapped, numerous tree branches broken, power poles snapped and leaning, and several large metal grain bins destroyed.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 16:35:00 to 11-AUG-19 16:35:00 (MST-7)
Location: WRAY MUNI ARPT
Magnitude: 70.00 EG
Reported by: Storm Chaser

There was also some blowing dust seen on the webcam at Wray as well with this storm at this time.

Hail in YUMA, COLORADO
From 11-AUG-19 15:57:00 to 11-AUG-19 15:57:00 (MST-7)
Location: CLARKVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in CHEYENNE, COLORADO
From 11-AUG-19 18:12:00 to 11-AUG-19 18:12:00 (MST-7)
Location: ARAPAHOE
Magnitude: 70.00 EG
Property damage: 80.00K
Reported by: Emergency Manager

Significant damage and a power outage was originally reported by emergency management in Arapahoe due to thunderstorm wind gusts. Additional damage reports from the public in Arapahoe included the following: a 30 foot by 80 foot Quonset hut was completely destroyed, numerous power lines were downed, multiple houses had their roofs blown off, and a large steel building with a concrete base was destroyed as a result of this thunderstorm wind event.

Hail in YUMA, COLORADO
From 11-AUG-19 14:45:00 to 11-AUG-19 14:45:00 (MST-7)
Location: YUMA
Magnitude: 0.75 
Reported by: Public

Hail in YUMA, COLORADO
From 11-AUG-19 15:10:00 to 11-AUG-19 15:10:00 (MST-7)
Location: CLARKVILLE
Magnitude: 1.00 
Reported by: Public

Hail in YUMA, COLORADO
From 11-AUG-19 15:40:00 to 11-AUG-19 15:40:00 (MST-7)
Location: YUMA
Magnitude: 2.50 
Reported by: Trained Spotter

Hail in YUMA, COLORADO
From 11-AUG-19 15:40:00 to 11-AUG-19 15:40:00 (MST-7)
Location: CLARKVILLE
Magnitude: 2.75 
Property damage: 2.00K
Reported by: Storm Chaser

Significant damage was reported to a car windshield. Hail stones ranged from golf ball to baseball in size.

Hail in YUMA, COLORADO
From 11-AUG-19 17:15:00 to 11-AUG-19 17:15:00 (MST-7)
Location: ECKLEY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail reportedly ranged from nickel to quarter size. Approximately 60 mph wind gusts were also reported at this time and location.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 17:15:00 to 11-AUG-19 17:15:00 (MST-7)
Location: ECKLEY
Magnitude: 52.00 EG
Reported by: Trained Spotter

Approximately 60 mph winds were estimated by a trained spotter about 5 miles south of Eckley. In addition, nickel to quarter size hail was also observed at this location at this time.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 17:30:00 to 11-AUG-19 17:30:00 (MST-7)
Location: WRAY BOWMAN ARPT
Magnitude: 70.00 EG
Reported by: Trained Spotter

Winds were estimated by a trained spotter.

Tornado in YUMA, COLORADO
From 11-AUG-19 15:04:00 to 11-AUG-19 15:04:00 (MST-7)
Location: CLARKVILLE
Tornado F-scale: EFU
Reported by: Public

A brief tornado was observed roughly 7 miles south of Clarkville.

Tornado in YUMA, COLORADO
From 11-AUG-19 15:20:00 to 11-AUG-19 15:20:00 (MST-7)
Location: YUMA
Tornado F-scale: EFU
Reported by: Public

A member of the public reported a brief tornado was observed about 6 miles NW of Yuma. They sent a picture confirming their observation to NWS Goodland.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 16:39:00 to 11-AUG-19 16:42:00 (MST-7)
Location: WRAY MUNI ARPT
Magnitude: 87.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS Storm Survey confirmed straight line wind swath of damage north of Wray, CO along County Road LL. At this location, damage consisted of a power poles and trees snapped, crops flattened, and damage to a large metal grain bin.

Thunderstorm Wind in YUMA, COLORADO
From 11-AUG-19 16:34:00 to 11-AUG-19 16:37:00 (MST-7)
Location: WRAY MUNI ARPT
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS Storm Survey confirmed straight line wind swath of damage north of Wray, CO, further south along County Road KK. At this location, damage consisted of few snapped trees and tree limbs, as well as loss of metal roofing material on a farm shed.