Periods of heavy rain and possibly severe thunderstorms are expected from Wednesday about 1:00 p.m. through Friday about 6:00 a.m. Models are currently predicting about 4.0 inches of rain during the time period for Arlington Heights.
Training of thunderstorm cells with runs of continuous thunderstorms may cause higher amounts in some areas.
The Convective Outlook from the National Weather Service Storm Prediction Center places a 5% probability of a Tornado occurring within 25 miles of any point in Chicagoland. Valid from 4.17.2013 at 7:00 a.m. until 4.18.2013 at 7:00 a.m. (See the current outlook …)
FLOOD WATCH
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
937 PM CDT TUE APR 16 2013
…FLOOD WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH FRIDAY
MORNING…
.SEVERAL ROUNDS OF SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
AFFECT THE REGION WEDNESDAY THROUGH EARLY FRIDAY…AS A DEEP UPPER
TROUGH AND SURFACE LOW PRESSURE SYSTEM LIFT NORTHEAST ACROSS THE
AREA. WARM AND VERY MOIST AIR WILL BE TRANSPORTED NORTH FROM THE
GULF OF MEXICO AHEAD OF THIS STORM SYSTEM…RESULTING IN THE
POTENTIAL FOR PERIODS OF LOCALLY HEAVY RAINFALL FROM WEDNESDAY
AFTERNOON THROUGH LATE THURSDAY NIGHT. PREVIOUS RAINFALL OVER THE
PAST WEEK OR TWO HAS ALREADY MOISTENED SOILS AND CAUSED
SIGNIFICANT RISES IN RIVER LEVELS ACROSS MUCH OF NORTHERN
ILLINOIS AND NORTHWEST INDIANA…AND ADDITIONAL HEAVY RAINFALL
OVER THE NEXT FEW DAYS WILL LIKELY RESULT IN AREAS OF FLOODING.
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…BELVIDERE…WOODSTOCK…
WAUKEGAN…OREGON…DIXON…DEKALB…AURORA…WHEATON…CHICAGO…
OTTAWA…OSWEGO…MORRIS…JOLIET…KANKAKEE…PONTIAC…
WATSEKA…PAXTON…GARY…VALPARAISO…MOROCCO…RENSSELAER…
FOWLER
937 PM CDT TUE APR 16 2013 /1037 PM EDT TUE APR 16 2013/
…FLOOD WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH
FRIDAY MORNING…
THE 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 WEDNESDAY AFTERNOON THROUGH FRIDAY MORNING.
* AN EXTENDED PERIOD OF HEAVY RAINFALL FROM THUNDERSTORMS WILL
PRODUCE WIDESPREAD STORM TOTAL RAINFALL AMOUNTS APPROACHING 4
INCHES OVER NORTHERN ILLINOIS AND NORTHWESTERN INDIANA.
LOCALLY HIGHER AMOUNTS ARE POSSIBLE IN AREAS WHERE REPEATED
TRAINING OF STORMS MAY OCCUR.
* AREA STREAMS AND RIVERS THAT ARE CURRENTLY NEAR OR AT FLOOD
STAGE WILL LIKELY RISE TO MODERATE OR MAJOR FLOOD STAGE. HEAVY
RAINFALL WILL LIKELY LEAD TO FLOODING OF LOW LYING URBAN
AREAS. ALSO…RAINFALL RATES AND AMOUNTS MAY EXCEED THE
CAPACITY OF STORM DRAINS…DRAINAGE PONDS AND DRAINAGE DITCHES
ALONG ROADWAYS…LEADING TO FLOODING IN SUBURBAN AREAS AS WELL
AS URBAN AREAS.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.
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