WINTER WEATHER ADVISORY Evening Update

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URGENT – WINTER WEATHER MESSAGE…CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
412 PM CST THU FEB 23 2012

…RAIN TO CHANGE TO A WET SNOW AND BE HEAVY AT TIMES TONIGHT…

.A LOW PRESSURE SYSTEM OVER SOUTHERN ILLINOIS WILL CONTINUE TO
TRACK ACROSS THE LOWER OHIO VALLEY THIS EVENING…IN ASSOCIATION
WITH A STRONG UPPER LEVEL DISTURBANCE WHICH WILL MOVE FROM WESTERN
IOWA INTO THE WESTERN GREAT LAKES REGION BY EARLY FRIDAY MORNING.
AS THIS OCCURS…AN AREA OF RAIN AND MIXED RAIN AND WET SNOW
ACROSS FAR NORTHERN ILLINOIS WILL EXPAND AND INCREASE IN INTENSITY
THIS EVENING…CHANGING TO ALL SNOW FROM NORTHWEST TO SOUTHEAST
THROUGH LATE EVENING. SNOW WILL BECOME HEAVY AT TIMES…ESPECIALLY
IN THE HOURS JUST AFTER CHANGEOVER…AND MAY BE ACCOMPANIED BY
THUNDER. THIS ENHANCED BAND OF SNOW WILL BE THE MOST FAVORED
LOCATION FOR HIGHER SNOWFALL AMOUNTS IN THE 6 TO 7 INCH RANGE…
AND AT THIS TIME IT APPEARS THAT AREAS FROM LEE AND OGLE COUNTIES
EAST INTO DEKALB…KANE…DUPAGE…NORTHERN COOK AND SOUTHERN LAKE
COUNTIES MAY HAVE THE GREATEST RISK OF SEEING HEAVIER BANDED SNOW
FROM MID EVENING INTO THE OVERNIGHT HOURS. THE SNOW WILL GRADUALLY
TAPER FROM WEST TO EAST ACROSS THE AREA LATE TONIGHT THROUGH
FRIDAY MORNING.

ILZ006-013-014-022-240630-
/O.CON.KLOT.WW.Y.0006.120224T0000Z-120224T1500Z/
LAKE IL-DUPAGE-COOK-WILL-
INCLUDING THE CITIES OF…WAUKEGAN…WHEATON…CHICAGO…JOLIET
412 PM CST THU FEB 23 2012

…WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST
FRIDAY…

* TIMING…RAIN…MIXED WITH WET SNOW AT TIMES…WILL CHANGE TO
ALL WET SNOW ACROSS FAR NORTHEAST ILLINOIS…INCLUDING
CHICAGO…EARLY THIS EVENING. SNOW MAY BECOME HEAVY AT TIMES
DURING THE EVENING AND EARLY OVERNIGHT HOURS…BEFORE GRADUALLY
TAPERING IN INTENSITY INTO EARLY FRIDAY MORNING.

* ACCUMULATIONS…FOUR TO SEVEN INCHES…WITH THE HIGHEST
AMOUNTS ACROSS DUPAGE…NORTHERN COOK…AND SOUTHERN LAKE
COUNTIES.

* MAIN IMPACT…HEAVY WET SNOW MAY FALL AT RATES GREATER THAN AN
INCH PER HOUR AFTER 8 PM. THIS WILL LIKELY RESULT IN QUICK
ACCUMULATION OF WET SNOW ON ROADS…RESULTING IN SLIPPERY AND
POTENTIALLY HAZARDOUS TRAVEL CONDITIONS.

* OTHER IMPACTS…IN ADDITION TO ACCUMULATION AND SLIPPERY
TRAVEL IMPACTS…STRONG WINDS WILL RESULT IN WIND WHIPPED
HEAVY WET SNOW CAUSING SEVERELY REDUCED VISIBILITIES THIS
EVENING THROUGH TONIGHT. DUE TO THE HIGH LIQUID CONTENT OF THE
SNOW… THOSE WITH HEALTH CONCERNS SHOULD USE CAUTION WHEN
SHOVELING.

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.

Arlington Heights Forecast as of 8:00 p.m.

Tonight: Rain and snow, becoming all snow after 9pm. The snow could be heavy at times. Some thunder is also possible. Low around 32. North northeast wind between 10 and 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 4 to 8 inches possible.

Friday: Snow. High near 35. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 2 inches possible.

Friday Night: A 30 percent chance of snow showers, mainly before midnight. Mostly cloudy, with a low around 19. West northwest wind between 10 and 15 mph, with gusts as high as 25 mph.



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