National Weather Service United States Department of Commerce


A weak tornado and very large hail developed near Chugwater, WY on June 20, 2010. Convection formed along a dry line that extended from just west of the Laramie Range northeast to Casper, Wyoming. Shortly after 4 PM, a supercell thunderstorm developed producing an EF0 tornado and hail up to 4 inches in diameter. The storm moved east-southeast for only a few miles before it dissipated. Several other supercell thunderstorms developed throughout the late afternoon producing large hail and significant flooding.

Rope tornado near Chugwater

Credit: Patti Fulton

Funnel descending from a wall cloud.

Credit Unknown

Video from Tony Laubach,


Tornado touched down east of Chugwater.

Credit: Micheal Carlson

nws logo Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.
nws logo