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Dense Fog Advisory Issued for Central, North Central, Southwest Montana

A Dense Fog Advisory has been issued for central, north central, and southwest Montana from 9 PM tonight until noon tomorrow, with visibility as low as one quarter mile and potential for ice on surfaces.

Staff Writer
10/12/2026 · Lewis and Clark County edition

Drivers in central, north central, and southwest Montana are advised to slow down, use headlights, and increase following distance due to a Dense Fog Advisory issued by the National Weather Service in Great Falls. The advisory is effective from 9 PM MDT this evening, October 12, until noon MDT tomorrow, October 13.

Visibility is expected to be as low as one quarter of a mile in dense fog. Affected areas include Eastern Glacier, Western Toole, Central Pondera, Eastern Toole, Liberty, Hill County, Northern Blaine County, Eastern Pondera, Eastern Teton, Western and Central Chouteau County, Bears Paw Mountains and Southern Blaine, Cascade County below 5000ft, Judith Basin County and Judith Gap, Fergus County below 4500ft, Helena Valley, Meagher County Valleys, Canyon Ferry Area, Missouri Headwaters, Madison River Valley, and Gallatin Valley.

Additionally, below-freezing temperatures may lead to a glaze of ice on surfaces, particularly on bridges and overpasses. Motorists should exercise extreme caution.

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