On June 12, the Storm Prediction Center issued a moderate risk for severe thunderstorms across southeast Wyoming, northwest Nebraska, and southwest South Dakota.
The risk area included a 15% hatched area for tornadoes across southeastern Wyoming, and a 45% hatched area for severe hail across the entire moderate risk area.
In the early afternoon, the Storm Prediction Center issued a Particularly Dangerous Situation tornado watch across the hatched area for tornadoes, as supercells began to form along the northern part of a cold front.
Several tornadoes touched down in Colorado, Wyoming, and Nebraska, including four EF2 tornadoes.
One of these tornadoes was caught on video and photographed by numerous storm chasers as it passed near Carpenter, Wyoming, causing severe damage to outbuildings, vehicles, power poles, and homes in the area.
An EF2 near Torrington tossed vehicles and horse trailers, heavily damaged a home, killed three horses, and injured two people.
Another EF2 near Kaycee snapped many trees and destroyed a mobile home.
In Nebraska, a long-track, multiple-vortex EF2 tornado passed near Bayard, tearing the roof and an exterior wall from a house, denuding trees, twisting irrigation pivots, damaging outbuildings, and destroying a garage.
A separate brief EF1 tornado touched down in Bayard, causing considerable damage to a nursing home.
In the late afternoon and early evening, the supercells merged into a squall line and produced isolated damaging wind gusts across South Dakota.

The next day, the Storm Prediction Center issued an enhanced risk for severe weather, including a 10% risk area for tornadoes across parts of the Dakotas and Minnesota.
In the mid-afternoon, supercells began to form along a cold front in eastern South Dakota.
Additionally, numerous severe thunderstorms formed along the front from Minnesota to Texas.
The storms produced multiple weak tornadoes throughout the risk area, none of which exceeded EF1 in intensity.
By early evening, the cells merged into a squall line and continued east.
The squall line continued to produce a few more tornadoes, in addition to large hail and damaging straight-line winds.
On June 14, the squall line continued to produce wind damage, as well as producing a few more weak tornadoes in Wisconsin, all of which did relatively minor damage.
Overall, this outbreak produced 40 tornadoes and did not result in any fatalities.
On June 12, the Storm Prediction Center issued a moderate risk for severe thunderstorms across southeast Wyoming, northwest Nebraska, and southwest South Dakota. The risk area included a 15% hatched area for tornadoes across southeastern Wyoming, and a 45% hatched area for severe hail across the entire moderate risk area. In the early afternoon, the Storm Prediction Center issued a Particularly Dangerous Situation tornado watch across the hatched area for tornadoes, as supercells began to form along the northern part of a cold front. Several tornadoes touched down in Colorado, Wyoming, and Nebraska, including four EF2 tornadoes. One of these tornadoes was caught on video and photographed by numerous storm chasers as it passed near Carpenter, Wyoming, causing severe damage to outbuildings, vehicles, power poles, and homes in the area. An EF2 near Torrington tossed vehicles and horse trailers, heavily damaged a home, killed three horses, and injured two people. Another EF2 near Kaycee snapped many trees and destroyed a mobile home. In Nebraska, a long-track, multiple-vortex EF2 tornado passed near Bayard, tearing the roof and an exterior wall from a house, denuding trees, twisting irrigation pivots, damaging outbuildings, and destroying a garage. A separate brief EF1 tornado touched down in Bayard, causing considerable damage to a nursing home. In the late afternoon and early evening, the supercells merged into a squall line and produced isolated damaging wind gusts across South Dakota.
The next day, the Storm Prediction Center issued an enhanced risk for severe weather, including a 10% risk area for tornadoes across parts of the Dakotas and Minnesota. In the mid-afternoon, supercells began to form along a cold front in eastern South Dakota. Additionally, numerous severe thunderstorms formed along the front from Minnesota to Texas. The storms produced multiple weak tornadoes throughout the risk area, none of which exceeded EF1 in intensity. By early evening, the cells merged into a squall line and continued east. The squall line continued to produce a few more tornadoes, in addition to large hail and damaging straight-line winds. On June 14, the squall line continued to produce wind damage, as well as producing a few more weak tornadoes in Wisconsin, all of which did relatively minor damage. Overall, this outbreak produced 40 tornadoes and did not result in any fatalities.
Tornadoes of 2017