ST. LOUIS — The National Weather Service has issued a Dense Fog Advisory for most of our Illinois counties until 10 a.m. Tuesday.
With lingering moisture from the weekend rain, locally dense fog has formed in many areas along and east of the Mississippi River. Visibilities have dropped to or below a quarter mile.
Low visibility can make driving conditions hazardous. Leave extra time for your morning commute, slow down with plenty of distance ahead of you and use low beam headlights.
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A Dense Fog Advisory is issued when widespread visibilities of a quarter of a mile or less are expected. Much of central and southern Illinois are under the Dense Fog Advisory until 10 a.m. Tuesday morning.
Interstates included in the Dense Fog Advisory include I-55, I-70 and I-64 out of St. Louis and I-57 through much of central and southern Illinois. I-55 in parts of southeast Missouri are also in the Dense Fog Advisory.
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The Weather First Team will use "Storm Alert" to refer to life-threatening or major-impact weather conditions in our region. "Weather Alert" refers to nuisance or disruptive weather and is indicated by orange icons and bars in our weather graphics on TV and online.
