Abundant low level moisture and light winds have caused dense fog to become widespread across eastern Iowa, northwest and western Illinois, and extreme northeast Missouri. Visibilities will be frequently 1/4 mile or less for much of the remainder of the day.
A dense fog advisory is in effect until 3pm this afternoon. Visibilities will be less than one quarter of a miles.
Freezing fog may cause roadways and walkways to become slippery. Anyone traveling today should allow extra travel time due to slippery roads and reduced visibility.