Special Weather Statement issued April 10 at 2:36AM CDT by NWS Milwaukee/Sullivan WI

Fog is developing across southwest Wisconsin this morning.
Widespread visibilities between 1/2 and 1 mile have been observed,
and will continue into the first half of this morning. Pockets of
locally dense fog with visibilities below 1/4 mile are possible.
Trends will continue to be monitored for possible Dense Fog
Advisories through daybreak. Budget extra time, slow down, & use
low beam headlights if encountering areas of fog through sunrise.