Rhinelander, WI – The National Weather Service (NWS) in Green Bay has issued a Dense Fog Advisory for parts of north-central Wisconsin, warning that visibility could drop to one-quarter mile or less in several locations during the early hours of Thursday, October 30, 2025.
The Weather Advisory and Affected Areas
According to the NWS advisory issued at 2:15 a.m., the Dense Fog Advisory remains in effect until 9 a.m. for multiple north-central communities, including Rhinelander, Park Falls, and Ironwood. The advisory also extends southeast toward Wausau and Stevens Point, where patchy fog is expected to persist through early morning.
Forecasters warned that freezing fog could develop in isolated areas where temperatures dip below freezing, creating slick and hazardous conditions on bridges, overpasses, and untreated roads.
“Visibility could be reduced to near zero in spots, making travel difficult, especially along rural and low-lying areas,” the NWS said in its advisory.
Travel Impacts and Safety Recommendations
Drivers across north-central Wisconsin are being urged to exercise extreme caution during the morning commute. The NWS advises motorists to slow down, use low-beam headlights, and maintain extra following distance between vehicles.
Visibility is expected to fluctuate rapidly, particularly along Highways 8, 51, and 70, where fog is likely to be most dense. Commuters should allow additional travel time and remain alert for vehicles and pedestrians that may be difficult to see.
Law enforcement agencies and local emergency services are also reminding drivers that freezing fog can leave a thin layer of ice on surfaces, leading to unexpected slippery spots, even when roadways appear dry.
Meteorological Background and Conditions
Dense fog typically forms overnight when moist air cools rapidly under clear skies and light winds, causing water vapor to condense near the surface. In north-central Wisconsin, recent rainfall and cooling temperatures have contributed to increased ground moisture, creating ideal conditions for fog formation.
As temperatures hover near or below the freezing mark, some areas may experience freezing fog, which can deposit a thin coating of ice on windshields, tree branches, and elevated road surfaces.
The NWS Green Bay office reported that winds will remain calm to light, allowing fog to linger through the early morning hours before gradually dissipating after sunrise.
Expected Improvements and Next Steps
Meteorologists expect visibility to improve by mid- to late morning as temperatures rise and sunlight mixes out the fog layer. By 10 a.m., conditions should return to normal across most of the advisory area.
Residents are encouraged to check updated forecasts and use real-time weather apps or local radio for any changes to advisories. The National Weather Service will continue monitoring conditions and issue additional updates if the fog lingers longer than anticipated.
Conclusion
With dense fog and the potential for freezing patches early Thursday, motorists in north-central Wisconsin are urged to plan ahead, drive carefully, and stay alert for changing visibility. As temperatures climb through the morning, travel conditions should steadily improve, providing a clearer and safer commute for the region.
What are conditions like in your area this morning? Share your updates or travel experiences in the comments below.
