Shortly after 6 PM on Monday, a tornado developed approximately 13-16 miles northwest of Cheyenne. The tornado touched down between Horse Creek, Wy and Federal, WY over open land. The tornado was on the ground for 10 to 12 minutes and no damage was reported.
As of 8:30 on Friday evening there was no estimate on the strength of the tornado and we may never know. If no structures were hit, the National Weather Service will not be able to conduct a damage survey to figure out the storm's strength. This would make the tornado an EF0 by default.
This tornado developed only days after a severe thunderstorms brought two inch diameter hail and a funnel cloud to the Cheyenne area. These recent severe weather events come on the end of what is typically peak tornado season for Southeast Wyoming. Peak tornado season in SE Wyoming runs from early June through mid July. The most damaging tornado to ever move through SE Wyoming was on July 16, 1979 when a tornado ripped through northern parts of Cheyenne doing F3 (158 - 207 MPH) damage.