Arlington Heights Snowpack 8 inches with Flash Flood Watch

Local Severe Weather Alert for Arlington Heights, IL (60004) below …

Arlington Heights has 8 inches of ice-crusted snow pack at 9:15 a.m.

Friday.

Current Observations:

Temperature: 33 F

Wind: SE 12 MPH

/O.CON.KLOT.FF.A.0007.081227T0600Z-081228T0600Z/ /00000.0.IC.

000000T0000Z.000000T0000Z.000000T0000Z.OO/ WINNEBAGO-BOONE-MCHENRY-

LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK- LA SALLE-KENDALL-GRUNDY-

WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD- LAKE IN-PORTER-NEWTON-JASPER-

BENTON- INCLUDING THE CITIES OF…ROCKFORD…WOODSTOCK…WAUKEGAN…

OREGON…DIXON…DEKALB…AURORA…CHICAGO…OTTAWA…OSWEGO…

MORRIS…JOLIET…KANKAKEE…PONTIAC…WATSEKA…PAXTON…GARY…

VALPARAISO…MOROCCO…RENSSELAER…FOWLER 634 AM CST FRI DEC 26 2008 /734

AM EST FRI DEC 26 2008/

…FLASH FLOOD WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH

SATURDAY EVENING…

THE FLASH FLOOD WATCH CONTINUES FOR

* PORTIONS OF ILLINOIS AND INDIANA…INCLUDING THE FOLLOWING

AREAS…IN ILLINOIS…BOONE…COOK…DE KALB…DUPAGE…FORD…

GRUNDY…IROQUOIS…KANE…KANKAKEE…KENDALL…LA SALLE… LAKE

IL…LEE…LIVINGSTON…MCHENRY…OGLE…WILL AND WINNEBAGO. IN

INDIANA…BENTON…JASPER…LAKE IN…NEWTON AND PORTER.

* FROM LATE TONIGHT THROUGH SATURDAY EVENING

* WIDESPREAD…AND POTENTIALLY SIGNIFICANT FLOODING IS EXPECTED TO

DEVELOP FRIDAY NIGHT INTO SATURDAY. RAIN AND EMBEDDED THUNDERSTORMS

WILL PRODUCE WIDESPREAD RAINFALL TOTALS OF ONE AND A HALF TO THREE

INCHES FRIDAY NIGHT THROUGH SATURDAY NIGHT…WITH LOCALIZED RAINFALL

TOTALS IN EXCESS OF THREE INCHES POSSIBLE. IN ADDITION TO THE HEAVY

RAIN…TEMPERATURES WARMING WELL ABOVE FREEZING WILL CAUSE EXISTING

SNOW AND ICE COVER TO RAPIDLY MELT WHICH WILL INCREASE RUN OFF…WHICH

WILL ALREADY BE VERY HIGH DUE TO THE FROZEN GROUND. ALSO…THE BITTER

COLD TEMPERATURES OF THE PAST WEEK HAVE CAUSED ICE TO FORM ON MANY

RIVERS…THIS ICE WILL LIKELY BECOME DISLODGED AS TEMPERATURES RISE

ABOVE FREEZING AND STREAM FLOW INCREASES. THIS WILL RESULT IN A HIGHER

CHANCE OF LOCALIZED FLOODING DUE TO ICE JAMS. FINALLY…MANY DRAINAGE

SYSTEMS ARE CURRENTLY BLOCKED BY SNOW AND ICE COVER…SO AS HEAVY RAIN

FALLS FLOODING WILL LIKELY DEVELOP EVEN IN URBANIZED AREAS THAT DO

NOT FLOOD OFTEN.

* IF CURRENT FORECAST RAINFALL AMOUNTS OCCUR AS EXPECTED THEN

WIDESPREAD AND SIGNIFICANT FLOODING OF CREEKS…STREAMS…AND LOW

LYING AREAS WILL OCCUR. IN ADDITION…MANY OF THE LARGER MAIN STEM

RIVERS WILL GO INTO FLOOD. GIVEN THE FORECAST MAGNITUDE OF THE

UPCOMING SNOW MELT AND HEAVY RAINFALL EVENT… MAJOR FLOODING AND NEAR

RECORD CRESTS MAY OCCUR ON SOME OF THE LARGER MAIN STEM

RIVERS…INCLUDING THE DES PLAINES… KANKAKEE…VERMILLION…LITTLE

CALUMET…IROQUOIS…AND ILLINOIS.

THE POTENTIAL EXISTS FOR VERY SERIOUS AND POTENTIALLY LIFE THREATENING

FLOODING TO DEVELOP THIS WEEKEND…WITH SOME AREAS THAT TYPICALLY DO

NOT FLOOD POSSIBLY EVEN BECOMING INUNDATED WITH WATER. PEOPLE LIVING

IN FLOOD PRONE AND LOW LYING AREAS SHOULD PAY VERY CLOSE ATTENTION TO

LATER FORECASTS AND WARNINGS FROM THE NATIONAL WEATHER SERVICE AND BE

PREPARED TO EVACUATE TO HIGHER GROUND ON SHORT NOTICE. EVERYONE IN AND

NEAR THE WATCH AREA SHOULD BE PREPARED TO TAKE QUICK ACTION SHOULD

FLOOD WARNINGS BE ISSUED.

PEOPLE PLANNING TO TRAVEL THIS WEEKEND SHOULD ALSO MONITOR FORECASTS

CLOSELY…AS FLOODING COULD POTENTIALLY IMPACT ROADS MAKING TRAVEL

DIFFICULT.