Warm moist air is streaming northward out of the Gulf of Mexico. As it rides over the cold snow cover of northern Illinois and southern Wisconsin, dense fog will form overnight, and persist through Friday. A DENSE FOG ADVISORY has been issued for Stephenson, Jo Daviess, Carroll, and Whitside Counties until 6 pm on Friday. I anticipate that advisory will be expanded to cover all on northern Illinois overnight. Be advised to slow down. Don't over-ride your headlights, and use low beams. After midnight tonight there will be drizzle too. Expect more drizzle on Thursday. On Thursday night showers will develop, and continue through Friday evening. There maybe even be some rumbles of thunder on Friday as a strong cold front sweeps in from the west, and clashes with the very warm and moist air over northern Illinois. With temperatures above freezing for close to 48 hours, melting snow, and the rainfall expected, there will be lots of water flowing into area steams that may be running close to bankfull by Friday night into the weekend. The temperatures may reach 50 degrees on Friday in advance of the front. When the front pushes across the area on Friday evening there will be a quick cut off in the precipitation, and a sharp drop in temperature after midnight. New Year's Day will be partly sunny, breezy and much colder with a high only in the low 20's.
By Meteorologist
Eric Nefstead
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