FLUS43 KLOT 071012
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
512 AM CDT SUN JUN 7 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-
512 AM CDT SUN JUN 7 2015
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS CAPABLE OF:
VERY HEAVY RAINFALL WITH POSSIBLE FLASH FLOODING.
DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
HAIL TO THE SIZE OF QUARTERS.
AREAS AFFECTED AND TIMING:
AN AREA OF WEAKENING SHOWERS AND THUNDERSTORMS WILL MOVE OVER
NORTHERN ILLINOIS THROUGH THE MORNING HOURS. THESE STORMS ARE
NOT EXPECTED TO BE SEVERE. HOWEVER...ADDITIONAL STORMS ARE
EXPECTED TO DEVELOP THIS AFTERNOON OVER NORTHERN ILLINOIS...
THEN INCREASE IN COVERAGE INTO THIS EVENING...WHILE GRADUALLY
SHIFTING SOUTHWARD.
DISCUSSION:
A COMPLEX OF THUNDERSTORMS MOVING OVER NORTHERN ILLINOIS EARLY
THIS MORNING IS EXPECTED TO WEAKEN. THESE STORMS ARE NOT
EXPECTED TO BE SEVERE. HOWEVER...STRONG TO SEVERE THUNDERSTORMS
ARE EXPECTED TO DEVELOP ACROSS PORTIONS OF NORTHERN ILLINOIS
AND NORTHWESTERN INDIANA DURING THE EARLY TO MID AFTERNOON
HOURS AS THE ATMOSPHERE DESTABILIZES OUT AHEAD OF AN
APPROACHING COLD FRONT. THESE STORMS WILL LIKELY CONTINUE TO
INCREASE IN AERIAL COVERAGE THROUGH THE AFTERNOON AND INTO THE
EVENING...POSSIBLY FORMING INTO A LINE OF STORMS THAT GRADUALLY
SHIFTS SOUTH THROUGH THE EVENING.
IT APPEARS THE PRIMARY SEVERE HAZARD FROM THESE STORMS WILL BE
STRONG DAMAGING WINDS. HOWEVER...HAIL COULD ALSO BE
HAZARD...ESPECIALLY THROUGH THE AFTERNOON. THE OTHER CONCERN
WILL BE THE THREAT OF VERY HEAVY RAINFALL WITH THESE STORMS.
GIVEN THE POTENTIAL OF STORMS PRODUCING RAIN RATES OF 1 TO 2
INCHES PER HOUR POSSIBLY TRAINING OVER THE SAME AREAS...FLASH
FLOODING COULD BECOME AN ISSUE IN SOME AREAS. THIS LOOKS TO BE
ESPECIALLY TRUE FOR AREAS ALONG AND SOUTH OF A LINE FROM
MENDOTA TO CHICAGO. IT APPEARS THE THREAT FOR HEAVY RAINFALL
WILL SHIFT SOUTH OF INTERSTATE 80 BY THIS EVENING THEN END
OVERNIGHT.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
SCATTERED THUNDERSTORMS ARE POSSIBLE ON MONDAY. SOME OF THESE
STORMS COULD BE STRONG WITH GUSTY WINDS AND POSSIBLY SOME
MARGINALLY SEVERE HAIL.
THERE IS ALSO A CHANCE FOR THUNDERSTORMS WEDNESDAY THROUGH
SATURDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND
EVENING.
&&
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