WINTER WEATHER ADVISORY EXPIRED — Snow Accumulation Low with Surprise Freezing Rain

Snow accumulation Monday night during a Winter Weather Advisory was on the low side. The National Weather Service warned of hazardous and slippery roads. However, it was the extreme slickness of freezing rain that caught motorists and the Illinois Department of Transportation by surprise.

Multiple crashes and spinouts occurred on Route 53, and multiple crashes occurred on main arteries and side streets in communities across Cook County and Lake County.

See The Cardinal Dangerous Ice Conditions with Multiple Rollover Crashes: Route 53, Palatine Rd …

Expired advisories below …

URGENT – WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
414 PM CST MON FEB 21 2011

Snow accumulations lowered to 2-4 inches. Heaviest accumulation is expected at the Illinois-Wisconsin state line. Snow is expected to end in Arlington Heights about 4:00 a.m.

MCHENRY-LAKE IL-DUPAGE-COOK-INCLUDING THE CITIES OF…WOODSTOCK…WAUKEGAN…WHEATON…CHICAGO
414 PM CST MON FEB 21 2011

…WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
TUESDAY…

A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
TUESDAY.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW…WHICH IS IN EFFECT UNTIL 6 AM TUESDAY.

* TIMING…INTERMITTENT LIGHT SNOW WILL BECOME STEADIER LATE THIS
EVENING AND INTO THE OVERNIGHT HOURS TONIGHT.

* ACCUMULATIONS…SNOW ACCUMULATIONS OF UP TO 4 INCHES ARE
POSSIBLE BY EARLY TUESDAY MORNING…ESPECIALLY NEAR THE
WISCONSIN STATE LINE.

* HAZARDS…SNOW ACCUMULATION.

* IMPACTS…SNOW ACCUMULATION TONIGHT WILL LEAD TO UNTREATED ROADS
BECOMING SNOW COVERED AND SLIPPERY. TUESDAY MORNINGS COMMUTE
WILL LIKELY BE IMPACTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW
COVERED ROADS AND LIMITED VISIBILITIES…AND USE CAUTION WHILE
DRIVING.

OLDER ADVISORY BELOW

URGENT – WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
418 AM CST MON FEB 21 2011

The best snowfall potential expected between about 2 PM Monday and tonight through midnight — north and northwest suburbs more than southwest suburbs.

DUPAGE-COOK-INCLUDING THE CITIES OF…WHEATON…CHICAGO
418 AM CST MON FEB 21 2011

…WINTER WEATHER ADVISORY IN EFFECT FROM NOON TODAY TO 6 AM CST
TUESDAY…

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW ACCUMULATION…WHICH IS IN EFFECT FROM
NOON TODAY TO 6 AM CST TUESDAY.

* TIMING…SNOW DEVELOPING EARLY THIS AFTERNOON AND CONTINUING
THROUGH MUCH OF TONIGHT.

* ACCUMULATIONS…3 TO 5 INCHES.

* HAZARDS…ACCUMULATING SNOW.

* IMPACTS…SNOW ACCUMULATION MAY LEAD TO SLIPPERY TRAVEL CONDITIONS
THIS AFTERNOON AND TONIGHT. THE MONDAY AFTERNOON RUSH HOUR WILL
LIKELY BE IMPACTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE PRIMARILY TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW
COVERED ROADS AND LIMITED VISIBILITIES…AND USE CAUTION WHILE
DRIVING.