...AREAS OF FOG TONIGHT... The combination of light winds and abundant low-level moisture will result in areas of fog across central and east-central Wisconsin tonight. Some of this fog may become locally dense with light drizzle falling at times. Northern Wisconsin is expected to have patchy fog overnight.
Current Watches, Warnings and Advisories for Brown (WIC009) Wisconsin Issued by the National Weather Service
https://alerts.weather.gov/cap/wwacapget.php?x=WI125F70F0F9EC.SpecialWeatherStatement.125F70F1FC20WI.GRBSPSGRB.f28f5803fae88a0ff8cc94271df94b85