Very large hail (possibly to baseballs), downburst winds to 70 mph and a few tornadoes are possible Wednesday afternoon through mid evening for the area.
The storm could produce gusty winds -- there's a 2% chance of tornadoes in the Casper-area. Severe hail will be the size of a quarter or bigger in Central Wyoming.
A supercell thunderstorm dropped hail larger than softballs in southern Sioux County, Nebraska Tuesday evening, according to the National Weather Service in Cheyenne.