Hazardous Weather Outlook for Mchenry Co., IL

FLUS43 KLOT 180950
HWOLOT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
450 AM CDT THU JUN 18 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-
450 AM CDT THU JUN 18 2015

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

.DAY ONE...TODAY AND TONIGHT.

WEATHER HAZARDS EXPECTED:

SCATTERED THUNDERSTORMS...SOME OF WHICH MAY PRODUCE:

TORRENTIAL RAINFALL.
FREQUENT CLOUD TO GROUND LIGHTNING.
WIND GUSTS OVER 60 MPH.
ISOLATED PENNY SIZED HAIL.

AREAS AFFECTED AND TIMING:

ISOLATED THUNDERSTORMS WILL BE POSSIBLE THIS MORNING ACROSS
THE REGION. THUNDERSTORMS WILL BECOME MORE NUMEROUS BY THIS
AFTERNOON...PARTICULARLY SOUTHEAST OF A PONTIAC ILLINOIS TO
GARY INDIANA LINE. THE GREATEST POTENTIAL FOR FLOODING OR
ISOLATED SEVERE WEATHER WILL BE IN THESE AREAS THIS AFTERNOON
INTO EARLY EVENING. THUNDERSTORMS SHOULD MOVE SOUTH OF THE
OUTLOOK AREA BY LATE EVENING.

DISCUSSION:

A COLD FRONT WILL MOVE SOUTHEAST ACROSS THE OUTLOOK AREA
TODAY...WITH SHOWERS AND THUNDERSTORMS INITIALLY ISOLATED
ACROSS THE AREA THIS MORNING. WITH DAYTIME HEATING THE
AIR MASS WILL DESTABILIZE BY MIDDAY...AND THUNDERSTORMS
ALONG AND AHEAD OF THE FRONT WILL BECOME MORE NUMEROUS
AND STRONGER. BY EARLY AFTERNOON THE COLD FRONT IS EXPECTED
TO BE PUSHING SOUTHEAST FROM ABOUT A PONTIAC TO GARY LINE.
THUNDERSTORMS SOUTH OF THIS LINE WILL HAVE THE GREATEST
POTENTIAL TO PRODUCE TORRENTIAL RAINFALL WHICH COULD LEAD
TO FLOODING...AS WELL AS ISOLATED DAMAGING WIND GUSTS ABOVE
60 MPH. THUNDERSTORMS WILL THEN GRADUALLY MOVE SOUTH OF THE
OUTLOOK AREA THIS EVENING.

PORTIONS OF THE DES PLAINES...WEST BRANCH OF THE DUPAGE...LOWER
FOX...ILLINOIS...IROQUOIS AND KANKAKEE RIVERS WILL BE IN FLOOD.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS MAINLY SOUTH
OF A PONTIAC TO VALPARAISO LINE FRIDAY THROUGH SATURDAY.

THERE WILL BE PERIODIC THUNDERSTORM CHANCES ACROSS THE OUTLOOK
AREA SATURDAY NIGHT THROUGH WEDNESDAY. SOME OF THE STORMS
SATURDAY NIGHT COULD BE SEVERE AND COULD ALSO PRODUCE LOCALLY
HEAVY RAINFALL.

PORTIONS OF THE DES PLAINES...ILLINOIS...IROQUOIS AND KANKAKEE
RIVERS REMAIN IN FLOOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT...THOUGH
REPORTS OF ANY ISOLATED SEVERE WEATHER OR RAINFALL MEASUREMENTS
ARE MOST WELCOME.

&&

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