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Severe Thunderstorm Watch

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 113
NWS STORM PREDICTION CENTER NORMAN OK
915 AM CDT WED APR 17 2013

SEVERE THUNDERSTORM WATCH 113 IS IN EFFECT UNTIL 500 PM CDT
FOR THE FOLLOWING LOCATIONS

. ILLINOIS COUNTIES INCLUDED ARE

BOONE BUREAU CARROLLSpecial Weather Statement
COOK DE KALB DUPAGE
FULTON GRUNDY HANCOCK
HENDERSON HENRY JO DAVIESS
KANE KANKAKEE KENDALL
KNOX LAKE LA SALLE
LEE LIVINGSTON MARSHALL
MCDONOUGH MCHENRY MERCER
OGLE PEORIA PUTNAM
ROCK ISLAND STARK STEPHENSON
TAZEWELL WARREN WHITESIDE
WILL WINNEBAGO WOODFORD



________________________________________

Special Weather Statement

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
935 AM CDT WED APR 17 2013

ILZ012>014-020-022-INZ001-171530-
COOK IL-DUPAGE IL-KANE IL-KENDALL IL-LAKE IN-WILL IL-
935 AM CDT WED APR 17 2013

...SPECIAL WEATHER STATEMENT...

AT 935 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR NAPERVILLE...MOVING EAST AT 30 MPH.

NICKEL SIZE HAIL...WINDS GREATER THAN 40 MPH...OCCASIONAL CLOUD TO
GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS
STORM.

CITIES AND TOWNS AFFECTED...
BOLINGBROOK... NAPERVILLE... LISLE...
ROMEOVILLE... WARRENVILLE... PLAINFIELD...
AURORA... WINFIELD... WOODRIDGE...

OTHER LOCATIONS AFFECTED...
ARGONNE NATIONAL LABORATORY...AURORA UNIVERSITY...BENEDICTINE
UNIVERSITY...BROOKFIELD ZOO...COLLEGE OF DUPAGE...DUPAGE COUNTY
FAIRGROUNDS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY
RAINFALL COULD LEAD TO STANDING WATER ON ROADWAYS AND POOR
VISIBILITY. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS
PASSED.
________________________________________
Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
458 AM CDT WED APR 17 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
181000-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
458 AM CDT WED APR 17 2013 /558 AM EDT WED APR 17 2013/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...TODAY AND TONIGHT.

WEATHER HAZARDS EXPECTED:

THUNDERSTORMS...A FEW MAY PRODUCE:
HAIL TO ONE INCH.
STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
HEAVY RAINFALL.
ISOLATED TORNADOES.

AREAS AFFECTED AND TIMING:

THUNDERSTORMS ARE EXPECTED TO STEADILY DEVELOP ACROSS EASTERN IOWA
THIS MORNING AND SPREAD EAST ACROSS NORTHERN ILLINOIS AND
NORTHWEST INDIANA...AS COVERAGE OF THUNDERSTORMS INCREASES.
THUNDERSTORMS ARE EXPECTED TO CONTINUE THROUGH TONIGHT. THE
POTENTIAL FOR SEVERE THUNDERSTORMS WILL BE ACROSS ALL OF THE
OUTLOOK AREA OF NORTHERN ILLINOIS AND NORTHWEST INDIANA THROUGH
TONIGHT.

DISCUSSION:

A WARM FRONTAL BOUNDARY IS EXPECTED TO LIFT NORTH ACROSS THE
AREA THIS AFTERNOON...WITH AN ANOMALOUSLY WARM AND MOIST AIRMASS
TO THE SOUTH OF THIS BOUNDARY. THUNDERSTORMS ARE EXPECTED TO DEVELOP
ALONG THIS WARM FRONT AND CONTINUE TO RIDE ALONG THIS BOUNDARY
THROUGH TONIGHT. THUNDERSTORMS MAY BECOME SEVERE THIS AFTERNOON
THROUGH TONIGHT AS THE INSTABILITY CONTINUES TO INCREASE THROUGHOUT
THE DAY...MAINLY FOR AREAS ALONG AND SOUTH OF INTERSTATE 80.
AT THIS TIME THE GREATEST HAZARDS FROM THUNDERSTORMS
WILL BE DAMAGING WIND GUSTS AND HAIL TO ONE INCH IN DIAMETER...ALONG
WITH HEAVY RAINFALL. IN ADDITION...SOME OF THE STRONGER THUNDERSTORMS
MAY BEGIN TO ROTATE ALONG OR JUST NORTH OF THE WARM FRONTAL BOUNDARY.
THUS THE POTENTIAL FOR AN ISOLATED TORNADO MAY OCCUR THIS AFTERNOON
INTO TONIGHT.

THUNDERSTORMS ARE EXPECTED TO TRAIN ACROSS THE SAME LOCATIONS
THIS EVENING INTO THE OVERNIGHT...WHICH MAY LEAD TO FLOODING. WITH
SATURATED SOILS ALREADY...ANY HEAVY RAINFALL WILL FURTHER EXACERBATE
THE CURRENT FLOODING CONDITIONS.

PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR
ABOVE FLOOD STAGE DUE TO RECENT RAINFALL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

SEVERAL ROUNDS OF HEAVY RAIN PRODUCING THUNDERSTORMS WILL CONTINUE
THROUGH THURSDAY. THIS MAY LEAD TO SIGNIFICANT FLOODING
ON AREA RIVERS...SOME OF WHICH ARE ALREADY NEAR OR ABOVE FLOOD
STAGE FROM PREVIOUS RAINFALL. LOCALLY HEAVY RAINFALL MAY ALSO
LIKELY RESULT IN FLOODING OF LOW LYING AND URBAN AREAS.

PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR
ABOVE FLOOD STAGE DUE TO RECENT RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED THIS AFTERNOON THROUGH TONIGHT.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

________________________________________

Flood Watch

FLOOD WATCH
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
407 AM CDT WED APR 17 2013

...FLOOD WATCH IN EFFECT FROM EARLY THIS AFTERNOON THROUGH FRIDAY
MORNING...

.SEVERAL ROUNDS OF SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
AFFECT THE REGION BEGINNING LATE THIS MORNING 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 LATE THIS
MORNING 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.

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
171715-
/O.CON.KLOT.FA.A.0002.130417T1800Z-130419T1200Z/
/00000.0.ER.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...BELVIDERE...WOODSTOCK...
WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO...
OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...PONTIAC...
WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...RENSSELAER...
FOWLER
407 AM CDT WED APR 17 2013 /507 AM EDT WED APR 17 2013/

...FLOOD WATCH REMAINS IN EFFECT FROM 1 PM CDT /2 PM EDT/ THIS
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 1 PM CDT /2 PM EDT/ THIS 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.