Areas of dense fog are developing across southern Iowa late this afternoon and will persist into tonight before improving late.
A dense fog advisory will be in effect until midnight tonight. Visibilities below a quarter mile, and near zero at times will be possible.
Driving will be hazardous when visibility falls rapidly. Please allow extra time for travel and drive with caution.
A dense fog advisory means visibilities will frequently be reduced to less than one quarter mile. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.