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HERE IS THE HAZARDOUS WEATHER OUTLOOK FOR PORTIONS OF NORTH CENTRAL AND NORTHEAST ILLINOIS.....DAY ONE...TODAY AND TONIGHT A FLOOD WATCH IS IN EFFECT FOR THE ENTIRE AREA THROUGH 12 PM CDT ON FRIDAY. THERE IS THE THREAT OF HEAVY RAIN LATE THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK OF NUMEROUS SEVERE THUNDERSTORMS LATE THIS AFTERNOON AND TONIGHT. A STRONG CAPPING INVERSION HAS INHIBITED THE DEVELOPMENT OF STORMS THUS FAR THIS AFTERNOON. HOWEVER RECENT CLEARING IN THE EXISTING LOW CLOUD COVER AND AN APPROACHING COLD FRONT IS ALLOWING FOR SLOW DESTABILIZATION OF THE AIRMASS. THE DESTABILIZATION WILL ALLOW FOR A WINDOW OF RAPID THUNDERSTORM DEVELOPMENT THROUGH TONIGHT. STORMS THAT DEVELOP HAVE THE POTENTIAL TO QUICKLY BECOME SEVERE...CAPABLE OF PRODUCING VERY LARGE HAIL...SEVERE WIND AND HEAVY RAINFALL. ADDITIONALLY THERE WILL BE A LOW THREAT OF TORNADOES WITH ANY STORMS THAT MAY BECOME SUPERCELLULAR...PRIMARILY ACROSS NORTH CENTRAL ILLINOIS. THE STORMS ARE EXPECTED TO DEVELOP FIRST OVER NORTHWEST ILLINOIS AND SPREAD EAST AT 25 TO 30 MPH. DUE TO THE SEVERE THREAT A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM CDT. LATER TONIGHT A SECOND ROUND OF THUNDERSTORMS WILL BE POSSIBLE THAT WILL MOVE EAST OUT OF IOWA. LARGE HAIL...SEVERE WINDS AND VERY HEAVY RAINFALL WILL BE THE PRIMARY THREATS. RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE LIKELY...WITH LOCAL AMOUNTS OF 2 TO 3 INCHES POSSIBLE. AMOUNTS OVER 2 INCHES MAY PRODUCE LOCAL FLOODING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AND HEAVY RAIN FRIDAY THROUGH SUNDAY. THE FRONT IS EXPECTED TO MOVE JUST NORTH OF THE AREA BY FRIDAY EVENING ALLOWING FOR A VERY UNSTABLE AIRMASS TO CONTINUE OVER THE REGION. THE AIRMASS COMBINED WITH A SERIES OF UPPER LEVEL DISTURBANCES WILL ALLOW FOR THE THREAT OF THUNDERSTORM ACTIVITY THROUGH SUNDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND TONIGHT.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED.... A FLOOD WATCH FOR PORTIONS OF NORTH CENTRAL AND NORTHEAST ILLINOIS UNTIL 1200 PM CDT FRIDAY AFTERNOON. THIS WATCH INCLUDES THE FOLLOWING COUNTIES... COOK...DE KALB...DU PAGE...FORD...GRUNDY...IROQUOIS...KANE...KANKAKEE...KENDALL...LA SALLE...LEE...LIVINGSTON...AND WILL. A SLOW MOVING OLD FRONT FROM EASTERN IOWA INTO SOUTHERN WISCONSIN WILL SAG SOUTH INTO THE AREA THIS EVENING. CONDITIONS WILL BE VERY UNSTABLE IN ADVANCE OF THIS FRONT LATE THIS AFTERNOON INTO THIS EVENING ACROSS THE AREA SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BECOME MORE WIDESPREAD LATE THIS AFTERNOON INTO THIS EVENING. RAINFALL AMOUNTS TONIGHT OF 1 TO 2 INCHES ARE EXPECTED...WITH LOCALIZED HIGHER AMOUNTS POSSIBLE. HEAVY RAINFALL HAS ALREADY FALLEN ACROSS PORTIONS OF THE AREA EARLIER THIS WEEK AND ADDITIONAL HEAVY RAINFALL WILL PRODUCE FLOODING IN AREA STREAMS AND RIVERS.

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THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN ILLINOIS IN EFFECT THIS THURSDAY EVENING FROM 330PM UNTIL 1000PM CDT. THIS WATCH INCLUDES THE FOLLOWING COUNTIES IN THE LOCAL AREA....IN CENTRAL ILLINOIS...MARSHALL AND LIVINGSTON. IN EAST CENTRAL ILLINOIS...IROQIOUS AND FORD. IN NORTH CENTRAL ILLINOIS...OGLE...DEKALB...LEE...LA SALLE...BUREAU...PUTNAM AND STARK. IN NORTHEAST ILLINOIS...COOK...KANE...DUPAGE...WILL...KENDALL...GRUNDY AND KANKAKEE. IN NORTHWEST ILLINOIS...CARROLL...WHITESIDE AND HENRY. IN WEST CENTRAL ILLINOIS...KNOX. HAIL 2 INHES IN DIAMETER...THUNDERSTORM WIND GUSTS UP TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENNG WEATHER CONDITIONS AN LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. REPEATING...A SEVERE THUNDSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT TONIGHT.

National Oceanic Atmospheric Administration

(NOAA)

National Weather Service

(NWS)

Storm Prediction Center

(SPC)