Hail in Fergus County, Montana

Spotter estimated hail up to an inch in size.

An embedded wave within more broad troughing digging into the Pacific Northwest moved across the region late night August 6 into August 7. Elevated instability increased as showers and thunderstorms moved eastward from Central Montana toward Fergus county. As these thunderstorms continued to balloon and cross Lewistown Divide, they became severe, producing a wide swath of gusts in excess of 55 mph, including a peak gust of 71 mph just east of Lewistown Divide.

Later in the day ample instability and shear developed across Fergus county again to result in an instance of large hail near Grass Range.