At 548 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles south of Sibley Peak, or 19 miles north of Wheatland, moving southeast at 25 mph.
HAZARD...Wind gusts of 50 to 55 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible.
Locations impacted include... Guernsey, Hartville, Oregon Trail Ruts State Historic Site, Dwyer Junction, Register Cliff State Historic Site, Grayrocks Reservoir, Sandy Cove Campground, and Guernsey State Park.