The Winter Weather Advisory was cancelled early as all precipitation is east of our forecast area. The Winter Weather Advisory expiration shortened to 6 AM from 9 AM. Also rain showers lasted a little later than expected last night.
A thin layer of ice exists on trees and side streets, but expressways and main arterial roadways are mostly cleared of ice. Some property damage and personal injury vehicle crashes were reported in the morning rush, probably related to weather.
For about two hours trains were stopped on the CTA Green Line between the 63rd/Ashland and Cottage Grove terminals and the Roosevelt station because of icing on the tracks.
URGENT – WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
337 PM CST SUN FEB 27 2011
…A MIXED BAG OF WINTRY PRECIPITATION EXPECTED TONIGHT THROUGH
MONDAY MORNING…
.A STRONG WARM FRONT EXTENDING FROM DEEPENING LOW PRESSURE OVER
THE OKLAHOMA PANHANDLE THROUGH CENTRAL ILLINOIS AND INDIANA TO
NORTHERN OHIO. SOUTH OF THIS FRONT LIES AN UNSEASONABLY WARM AND
MOIST AIRMASS…WHILE MUCH COOLER AIR RESIDES TO THE NORTH.
INITIALLY…THIS WARM FRONT WILL BE THE FOCUS FOR SHOWERS AND
THUNDERSTORMS…BUT AS THE WARM AIR MOVES NORTH…OVERRUNNING THE
COLD AIR AND THE WEDGE OF SHALLOW COLD AIR MOVES SOUTH…A PERIOD
OF FREEZING RAIN AND SLEET WILL BEGIN. THE FREEZING RAIN AND SLEET
WILL DEVELOP TO THE SOUTH OVERNIGHT…EVENTUALLY REACHING THE FAR
SOUTHEASTERN COUNTIES BY MORNING. AS THE AIRMASS WILL REMAIN
UNSTABLE INTO THE NIGHT…BRIEF BURSTS OF HEAVY SLEET IS LIKELY.
EVENTUALLY…THE LAYER OF WARM AIR ABOVE THE SUB-FREEZING AIR AT
THE SURFACE WILL BE ERODED BY DEEP LAYER COLD AIR AND THE
PRECIPITATION WILL CHANGE OVER TO ALL SNOW.
ILZ010>014-019>022-INZ001-280545-
/O.NEW.KLOT.WW.Y.0007.110228T0500Z-110228T1500Z/
LEE-DE KALB-KANE-DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-LAKE IN-
INCLUDING THE CITIES OF…DIXON…DEKALB…AURORA…WHEATON…
CHICAGO…OTTAWA…OSWEGO…MORRIS…JOLIET…GARY
337 PM CST SUN FEB 27 2011
…WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO
9 AM CST MONDAY…
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER
WEATHER ADVISORY FOR FREEZING RAIN AND SLEET CHANGING OVER TO
SNOW…WHICH IS IN EFFECT FROM 11 PM THIS EVENING TO 9 AM CST
MONDAY.
* TIMING…FREEZING RAIN AND SLEET OCCASIONALLY MIXING WITH SNOW
FROM LATE THIS EVENING THROUGH EARLY MONDAY MORNING…THEN SNOW
UNTIL LATE MONDAY MORNING.
* ACCUMULATIONS…ONE TO TWO TENTHS OF AN INCH OF SLEET AND
FREEZING RAIN. TOTAL SNOWFALL OF 1 TO 2 INCHES.
* HAZARDS…ACCUMULATING SLEET AND FREEZING RAIN CHANGING OVER TO
ACCUMULATING SNOW.
* IMPACTS…FREEZING PRECIPITATION WILL CAUSE DANGEROUS DRIVING
CONDITIONS.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW…SLEET…OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES…AND USE CAUTION WHILE
DRIVING.