Glasgow, MT – Drivers across the Hi-Line and northeastern Montana should prepare for hazardous conditions overnight as dense fog is expected to develop late Saturday into Sunday morning. According to the National Weather Service (NWS) in Glasgow, visibility could drop below a quarter mile at times, creating dangerous travel conditions from Havre to Glasgow, Sidney, and surrounding areas.
According to NWS, the highest probabilities for dense fog are concentrated across far northeastern portions of the state, where visibility restrictions may persist through early Sunday. Some communities along the Missouri River corridor could see prolonged patches of thick fog, which may expand or shift quickly depending on temperature and moisture levels.
Forecasters also warn that freezing fog may develop in some locations, increasing the risk of slick roads and icy sidewalks. Even a thin layer of freezing moisture can reduce traction and create hazardous conditions for both drivers and pedestrians. The agency urges residents to slow down, allow extra following distance, and use low-beam headlights when traveling.
The fog threat is expected to diminish gradually Sunday as temperatures rise and winds shift, but pockets of reduced visibility may linger into mid-morning in sheltered valleys and low-lying areas.
NWS encourages travelers to monitor real-time road reports, especially those heading along U.S. Highway 2 or rural routes that frequently experience visibility fluctuations. Sudden changes in fog density are likely, and conditions may vary significantly over short distances.
