FLUS43 KLOT 130954
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
454 AM CDT MON JUL 13 2015
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-
454 AM CDT MON JUL 13 2015
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...THE STRONGEST OF WHICH MAY PRODUCE:
EXTREME WIND GUSTS TO 80 MPH.
HAIL TO AT LEAST GOLF BALL SIZE.
TORNADOES...INCLUDING A STRONG TORNADO OR TWO.
TORRENTIAL DOWNPOURS AND FLASH FLOODING.
AREAS AFFECTED AND TIMING:
A COMPLEX OF THUNDERSTORMS WILL IMPACT AREAS MAINLY ALONG AND
NORTH OF INTERSTATE 80 THROUGH MID MORNING... THUNDERSTORMS
CANNOT BE RULED OUT FROM THE LATE MORNING THROUGH THE EARLY
AFTERNOON...BUT THE MAIN FOCUS FOR ANOTHER ROUND OF SEVERE
THUNDERSTORMS LOOKS TO BE FROM THE MID AFTERNOON THROUGH MID TO
LATE EVENING FOR THE ENTIRE OUTLOOK AREA.
DISCUSSION:
A THUNDERSTORM COMPLEX MOVING SOUTHEAST THROUGH WISCONSIN HAS
SHOWN A TENDENCY FOR SOME INTENSIFICATION EARLY THIS
MORNING...AND IT IS EXPECTED TO BRING A THREAT FOR DAMAGING WIND
GUSTS TO AREAS MAINLY ALONG AND NORTH OF INTERSTATE 80 THROUGH
MID MORNING. THERE MAY BE A THREAT FOR AN ISOLATED TORNADO WITH
THIS COMPLEX. THE NEXT ROUND OF POTENTIALLY MORE WIDESPREAD
HIGH-END SEVERE WEATHER IS EXPECTED TO UNFOLD MID AFTERNOON
THROUGH THE MID TO LATE EVENING HOURS. EXTREME INSTABILITY AND
STRONG WIND SHEAR WILL BE SUPPORTIVE OF ALL SEVERE HAZARDS IN
ANY SEVERE STORM.
ANY DISCRETE SUPERCELL COULD PRODUCE A STRONG
TORNADO OR TWO...AND THE FAVORED AREA FOR THIS MAY END UP BEING
IN A CORRIDOR FROM NORTHWEST ILLINOIS TO THE FAR SOUTH AND
SOUTHWEST CHICAGO METRO AND POINTS SOUTH AND WEST. LARGE TO VERY
LARGE HAIL WILL ALSO BE POSSIBLE...ESPECIALLY IN AFOREMENTIONED
CORRIDOR. IF EVOLUTION TO ONE OR MORE FAST MOVING THUNDERSTORM
COMPLEXES OCCURS...THEN THE THREAT WILL LIKELY EVOLVE TO
WIDESPREAD HIGH END DAMAGING WINDS...WITH AN ISOLATED TORNADO
AND HAIL THREAT. A VERY MOIST AIRMASS WILL REMAIN IN PLACE
THROUGH TONIGHT...SO ANY INTENSE THUNDERSTORM WILL PRODUCE
EXCESSIVE RAINFALL RATES AND THE POTENTIAL FOR RAPID FLASH
FLOODING.
HEAT INDEX VALUES ARE EXPECTED TO BE AROUND 105 DEGREES THIS
AFTERNOON IN A CORRIDOR FROM KANKAKEE COUNTY TO LEE COUNTY AND
POINTS SOUTH.
PORTIONS OF THE ILLINOIS...IROQUOIS...VERMILLION AND KANKAKEE
RIVERS...AND SUGAR CREEK ARE IN FLOOD....WITH RENEWED RISES
POSSIBLE DUE TO ANY HEAVY RAIN TODAY AND TONIGHT.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE IS A CHANCE FOR THUNDERSTORMS ON TUESDAY AND THEN A PERIODIC
CHANCE FOR THUNDERSTORMS THURSDAY THROUGH SUNDAY.
PORTIONS OF THE ILLINOIS...IROQUOIS...VERMILLION AND KANKAKEE
RIVERS...AND SUGAR CREEK WILL REMAIN IN FLOOD.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS WILL BE NEEDED THROUGH TONIGHT.
&&
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