Thunderstorm Wind in Fergus County, Montana

Thunderstorm Wind August 7, 2025 · Fergus County, Montana

62 mph

Measured gust (54 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Weather underground station near Grass Range.

The wider storm

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.

Began near Grassrange Clark Arp (47.0500, -108.8400).

Source: NOAA Storm Events Database, event 1287565. Narratives are written by the National Weather Service forecast office that issued the report.

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