Freezing rain is forecast to beging at midnight, but could possibly start as early as 9:00 p.m.
The Freezing Rain advisory includes all of Chicagoland, the north half of Illinois, northwest Indiana, southern counties of Wisconsin, and the eastern half of Iowa.
The precipitation will spread north in Chicagoland from 8:00 p.m. to 11:00 p.m.
About 0.12 ice accumulation is forecast for Arlington Heights by 9:00 a.m. Saturday morning.
Following the freezing rain, a period of rain from 6:00 a.m. Saturday to 11:00 p.m. Sunday is forecast to bring about 1.38 inches of rain.
URGENT – WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
245 AM CST FRI NOV 21 2014
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
KENDALL-WILL-LAKE IN-PORTER-
INCLUDING THE CITIES OF…ROCKFORD…BELVIDERE…WOODSTOCK…
WAUKEGAN…OREGON…DIXON…DEKALB…AURORA…WHEATON…CHICAGO…
OSWEGO…JOLIET…GARY…VALPARAISO
245 AM CST FRI NOV 21 2014
…FREEZING RAIN ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO
9 AM CST SATURDAY…
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A FREEZING
RAIN ADVISORY…WHICH IS IN EFFECT FROM 11 PM THIS EVENING TO
9 AM CST SATURDAY.
* TIMING…SCATTERED FREEZING RAIN SHOWERS WILL DEVELOP TOWARD
MIDNIGHT AND CONTINUE INTO EARLY SATURDAY MORNING WHEN AIR AND
PAVEMENT TEMPERATURES CLIMB ABOVE FREEZING.
* ICE ACCUMULATIONS…ONE TO LOCALLY TWO TENTHS OF AN INCH.
* OTHER IMPACTS…ROADS WILL BECOME ICE COVERED AND TRAVEL WILL
EXTREMELY HAZARDOUS ON UNTREATED ROADS.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
A FREEZING RAIN ADVISORY MEANS THAT PERIODS OF FREEZING RAIN OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS. SLOW DOWN AND USE CAUTION WHILE DRIVING.
As complement to video we tweeted about winter precip types, here's a graphic explaining how they form. #winterprep pic.twitter.com/YnPI1yRKm0
— NWS Chicago (@NWSChicago) November 21, 2014
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