FLUS43 KLOT 161605
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1105 AM CDT THU JUL 16 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-
1105 AM CDT THU JUL 16 2015
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...A FEW OF WHICH MAY PRODUCE...
HEAVY RAINFALL AND FLASH FLOODING.
WIND GUSTS IN EXCESS OF 40 MPH.
AREAS AFFECTED AND TIMING:
SCATTERED SHOWERS WILL DIMINISH THIS MORNING WITH A MAINLY
DRY AFTERNOON. THUNDERSTORMS WILL REFORM OVER IOWA THIS
AFTERNOON AND THEN SPREAD EAST LATE THIS AFTERNOON THROUGH
THE EARLY EVENING HOURS. THE BEST CHANCE FOR STRONG TO
ISOLATED SEVERE STORMS WILL BE FOR AREAS SOUTH OF A
BELVIDERE TO KANKAKEE LINE. THE HEAVY RAINFALL POTENTIAL IS
GREATEST THIS EVENING AND EARLY OVERNIGHT...AND INCLUDES
MUCH OF THE AREA.
DISCUSSION:
EXPECTING THUNDERSTORMS TO REDEVELOP OVER IOWA THIS AFTERNOON
AS THE OUTLOOK AREA SLOWLY DESTABILIZES. STORMS WILL SPREAD
EAST LATE THIS AFTERNOON THROUGH THE EARLY AFTERNOON.
INSTABILITY WILL BE GREATEST SOUTH OF A BELVIDERE TO KANKAKEE
LINE SO THINKING THOSE AREAS WILL HAVE A BETTER CHANCE OF
SEEING STRONGER STORMS. WIDESPREAD SEVERE WEATHER IS NOT
LIKELY...BUT AN ISOLATED SEVERE STORM OR TWO COULD OCCUR. OF
GREATER CONCERN IS THE INCREASING AMOUNT OF MOISTURE RETURNING
TO THE AREA BY THIS EVENING. THIS WILL RESULT IN HEAVY RAINFALL
RATES IN ANY STORMS AND THAT COULD LEAD TO FLASH
FLOODING...ESPECIALLY IF COVERAGE OF STORMS ARE WIDESPREAD OR
THEY MOVE SLOWER THAN ANTICIPATED. ANTECEDENT CONDITIONS ARE
VERY WET ALONG AND SOUTH OF THE I-80 CORRIDOR...AND THIS AREA
WOULD BE MOST SUSCEPTIBLE TO FLOODING.
PORTIONS OF THE ILLINOIS...IROQUOIS...AND KANKAKEE RIVERS REMAIN
IN FLOOD.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
THERE ARE PERIODIC CHANCES OF THUNDERSTORMS FRIDAY AND SATURDAY
AND THEN A GREATER CHANCE SATURDAY NIGHT AND SUNDAY.
VERY HUMID CONDITIONS ARE EXPECTED OVER THE OUTLOOK AREA FRIDAY
THROUGH SUNDAY WITH HEAT LIKELY TO ACCOMPANY THIS DURING ONE OR
ALL OF THE DAYS...SETTING THE STAGE FOR HEAT INDEX VALUES OF 100
TO 110.
PORTIONS OF THE ILLINOIS...IROQUOIS...AND KANKAKEE RIVERS REMAIN
IN FLOOD.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE ENCOURAGED TO REPORT HEAVY RAINFALL TOTALS TO THE
NATIONAL WEATHER SERVICE CHICAGO.
&&
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