If driving, slow down, use your low beam headlights, and leaveplenty of braking distance ahead of you.
* WHAT...Visibility one quarter of a mile or less in dense fog.* WHERE...Portions of north central, northwest, and west centralIllinois, east central and southeast Iowa, and northeast Missouri.* WHEN...Until 9 AM CDT this morning.* IMPACTS...Low visibility could make driving conditions hazardous.