# Dense Fog Advisory Covers North-Central Montana Overnight

The NWS forecasts visibility as low as a quarter-mile from Saturday night through Sunday noon, with slippery bridges and overpasses also possible.

By Will Langan | 24X7 News
Published: 2026-10-31T19:04:47.067Z
Updated: 2026-10-31T21:07:37.845Z
Section: U.S.
Format: News
Canonical: https://24x7news.us/articles/north-central-montana-dense-fog-advisory-october-31-2026

The National Weather Service in Great Falls issued a dense fog advisory October 31 for parts of north-central Montana, forecasting visibility as low as a quarter-mile overnight.

The advisory begins at 9 p.m. Mountain Daylight Time Saturday and continues until noon Mountain Standard Time Sunday, November 1. The period crosses the overnight switch to standard time.

Affected forecast zones include the northern and southern High Plains, Hill County, northern Blaine County, portions of Glacier, Toole, Pondera, Teton, Liberty and Chouteau counties, and the Bears Paw Mountains.

The notice also includes Cascade County below 5,000 feet, Fergus County below 4,500 feet, and the Judith Basin County and Judith Gap forecast area.

Forecasters warn that the reduced visibility could make driving hazardous. The bulletin says bridges and overpasses could become slippery.

The weather service advises drivers to slow down, use headlights and leave additional space ahead. The quarter-mile figure describes the lowest visibility forecast in the notice, rather than a uniform condition already measured throughout the advisory area.

The affected locations and validity period above come from the October 31 bulletin.

Sources
NWS Great Falls — October 31 Dense Fog Advisory: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.32feb768676e28c04c61a6c81a0d943f450ccf21.001.1

## Sources
- NWS Great Falls — October 31 Dense Fog Advisory: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.32feb768676e28c04c61a6c81a0d943f450ccf21.001.1
- Image — West Yellowstone landscape in sunrise 02; LMarianne; September 30, 2016; resized and branded: https://commons.wikimedia.org/wiki/File:West_Yellowstone_landscape_in_sunrise_02.jpg
- Image License — CC BY-SA 4.0; derivative distributed under same license: https://creativecommons.org/licenses/by-sa/4.0/