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Home Return to list Dense Fog Advisory 0004 Issued by the Chicago Forecast Office
Action: New Issued At: 2026-02-27 05:58:37 254 WWUS73 KLOT 271158 NPWLOT URGENT - WEATHER MESSAGE National Weather Service Chicago IL 558 AM CST Fri Feb 27 2026 ILZ012-013-020-021-104>108-271500- /O.NEW.KLOT.FG.Y.0004.260227T1200Z-260227T1500Z/ Kane-DuPage-Kendall-Grundy-Central Cook-Southern Cook-Northern Will-Southern Will-Eastern Will- Including the cities of Coal City, Aurora, Wheaton, Downers Grove, Oak Lawn, Carol Stream, Plainfield, Morris, Calumet City, Park Forest, Plano, Orland Park, Lombard, Channahon, Oswego, Lemont, Oak Park, Bolingbrook, Joliet, Elgin, Beecher, Cicero, Chicago, Crete, Minooka, Oak Forest, Manhattan, Mokena, Wilmington, Peotone, Naperville, Yorkville, and La Grange 558 AM CST Fri Feb 27 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Cook, DuPage, Eastern Will, Grundy, Kane, Kendall, Northern Will, Southern Cook, and Southern Will Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...The lowest visibilities are expected to remain west of downtown Chicago and away from the lakeshore. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ Petr Action: Area Extended Issued At: 2026-02-27 06:37:38 160 WWUS73 KLOT 271237 NPWLOT URGENT - WEATHER MESSAGE National Weather Service Chicago IL 637 AM CST Fri Feb 27 2026 ILZ011-019-023-271500- /O.EXA.KLOT.FG.Y.0004.000000T0000Z-260227T1500Z/ De Kalb-La Salle-Kankakee- Including the cities of Bourbonnais, Marseilles, Sycamore, La Salle, Mendota, DeKalb, Ottawa, Kankakee, Streator, and Bradley 637 AM CST Fri Feb 27 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...De Kalb, La Salle, and Kankakee Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Below freezing temperatures may lead to slick spots on untreated surfaces. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ ILZ012-013-020-021-104>108-271500- /O.CON.KLOT.FG.Y.0004.000000T0000Z-260227T1500Z/ Kane-DuPage-Kendall-Grundy-Central Cook-Southern Cook-Northern Will-Southern Will-Eastern Will- Including the cities of Coal City, Aurora, Wheaton, Downers Grove, Oak Lawn, Carol Stream, Plainfield, Morris, Calumet City, Park Forest, Plano, Orland Park, Lombard, Channahon, Oswego, Lemont, Oak Park, Bolingbrook, Joliet, Elgin, Beecher, Cicero, Chicago, Crete, Minooka, Oak Forest, Manhattan, Mokena, Wilmington, Peotone, Naperville, Yorkville, and La Grange 637 AM CST Fri Feb 27 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Cook, DuPage, Eastern Will, Grundy, Kane, Kendall, Northern Will, Southern Cook, and Southern Will Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Below freezing temperatures may lead to slick spots on untreated surfaces. * ADDITIONAL DETAILS...The lowest visibilities are expected to remain west of downtown Chicago and away from the lakeshore. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ Petr Action: Continued Issued At: 2026-02-27 06:37:38 160 WWUS73 KLOT 271237 NPWLOT URGENT - WEATHER MESSAGE National Weather Service Chicago IL 637 AM CST Fri Feb 27 2026 ILZ011-019-023-271500- /O.EXA.KLOT.FG.Y.0004.000000T0000Z-260227T1500Z/ De Kalb-La Salle-Kankakee- Including the cities of Bourbonnais, Marseilles, Sycamore, La Salle, Mendota, DeKalb, Ottawa, Kankakee, Streator, and Bradley 637 AM CST Fri Feb 27 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...De Kalb, La Salle, and Kankakee Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Below freezing temperatures may lead to slick spots on untreated surfaces. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ ILZ012-013-020-021-104>108-271500- /O.CON.KLOT.FG.Y.0004.000000T0000Z-260227T1500Z/ Kane-DuPage-Kendall-Grundy-Central Cook-Southern Cook-Northern Will-Southern Will-Eastern Will- Including the cities of Coal City, Aurora, Wheaton, Downers Grove, Oak Lawn, Carol Stream, Plainfield, Morris, Calumet City, Park Forest, Plano, Orland Park, Lombard, Channahon, Oswego, Lemont, Oak Park, Bolingbrook, Joliet, Elgin, Beecher, Cicero, Chicago, Crete, Minooka, Oak Forest, Manhattan, Mokena, Wilmington, Peotone, Naperville, Yorkville, and La Grange 637 AM CST Fri Feb 27 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Cook, DuPage, Eastern Will, Grundy, Kane, Kendall, Northern Will, Southern Cook, and Southern Will Counties. * WHEN...Until 9 AM CST this morning. * IMPACTS...Low visibility could make driving conditions hazardous. Below freezing temperatures may lead to slick spots on untreated surfaces. * ADDITIONAL DETAILS...The lowest visibilities are expected to remain west of downtown Chicago and away from the lakeshore. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ Petr Action: Cancelled Issued At: 2026-02-27 08:17:12 661 WWUS73 KLOT 271416 NPWLOT URGENT - WEATHER MESSAGE National Weather Service Chicago IL 816 AM CST Fri Feb 27 2026 ILZ011>013-019>021-023-104>108-271530- /O.CAN.KLOT.FG.Y.0004.000000T0000Z-260227T1500Z/ De Kalb-Kane-DuPage-La Salle-Kendall-Grundy-Kankakee-Central Cook- Southern Cook-Northern Will-Southern Will-Eastern Will- Including the cities of Streator, Manhattan, Elgin, Plainfield, Lombard, Mokena, DeKalb, Oswego, Bourbonnais, Morris, Plano, Wheaton, Oak Forest, Coal City, Naperville, Channahon, Orland Park, Park Forest, Crete, Chicago, Joliet, Bradley, Peotone, Yorkville, Carol Stream, Calumet City, Minooka, La Grange, Aurora, La Salle, Lemont, Beecher, Sycamore, Kankakee, Bolingbrook, Downers Grove, Oak Lawn, Cicero, Wilmington, Mendota, Ottawa, Oak Park, and Marseilles 816 AM CST Fri Feb 27 2026 ...DENSE FOG ADVISORY IS CANCELLED... Webcams and observations of visibility confirm that fog is eroding as expected this morning. With most areas no longer experiencing visibility below one quarter of a mile, the Dense Fog Advisory will be cancelled early. $$ Borchardt | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||