At 435 AM CDT /335 AM MDT/, a line of strong thunderstorms was located from 16 miles west of Alkabo to 9 miles northwest of Grassy Butte, or from 42 miles west of Crosby to 24 miles south of Watford City, moving east at 20 mph. HAZARD...Wind gusts of 50 to 55 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Williston, Watford City, Killdeer, Ray, Grenora, Alexander, Dunn Center, Arnegard, Wildrose, Epping, Alamo, Fortuna, Theodore Roosevelt National Park North Unit, Bonetrail, Fort Union Trading Post, Hanks, Grassy Butte, Writing Rock State Historical Site, and Mandaree.