Dense Fog Advisory
Visibility may sink to zero at times, but is expected to hover around a quarter mile, according to the National Weather Service.
Thunderstorms swept through the Chicago area overnight, but don’t get fooled — it’s still January, and more snow is soon coming.
Winter officially begins later Wednesday, but the Chicago area has a thick soup of fog in lieu of the usual snow and bitter winds.
Delays of up to three hours are being reported at Midway International Airport due to fog hovering over the Chicago area.