Olney, IL Severe Weather Alertstar_ratehome

...PATCHY DENSE FOG MAY AFFECT TRAVEL OVER SOUTHEAST ILLINOIS
THIS EVENING...

Patchy dense fog has formed across portions of southern Illinois in
the last couple of hours. Visibility has fallen below one-half mile
at times, leading to potentially hazardous travel conditions.

Expect rapid changes in visibility over short distances, with visibility
possibly even near zero at times.

Be sure to slow down if you encounter dense fog. Use low beam headlights if
driving, and leave plenty of distance between you and the vehicle ahead.