Hazardous Weather Outlook for Mchenry Co., IL

FLUS43 KLOT 210154 AAA
HWOLOT

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
854 PM CDT WED AUG 20 2014


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-
854 PM CDT WED AUG 20 2014 /954 PM EDT WED AUG 20 2014/

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

.DAY ONE...TONIGHT.

WEATHER HAZARDS EXPECTED:

SCATTERED THUNDERSTORMS...SOME COULD PRODUCE:
WIND GUSTS TO 50 MPH.
PEA TO NICKEL SIZE HAIL.
HEAVY RAINFALL LEADING TO LOCALIZED FLOODING.
FREQUENT CLOUD TO GROUND LIGHTNING.

AREAS AFFECTED AND TIMING:

ISOLATED THUNDERSTORMS WILL BE POSSIBLE ACROSS PORTIONS OF
NORTHERN ILLINOIS AND NORTHWEST INDIANA OVERNIGHT...WITH
THE POTENTIAL AND COVERAGE INCREASING DURING THE PRE-DAWN
HOURS AND INTO THURSDAY MORNING.

DISCUSSION:

A WARM FRONT FROM NEBRASKA TO DOWNSTATE ILLINOIS WILL LIFT
SLOWLY NORTH OVERNIGHT AND THURSDAY. ISOLATED SHOWERS AND
THUNDERSTORMS WILL DEVELOP OVERNIGHT NORTH OF THE FRONT...
WITH COVERAGE EXPECTED TO INCREASE DURING THE PRE-DAWN HOURS.
AN AREA OF MORE SUBSTANTIAL SHOWERS AND STORMS IS EXPECTED
TO DEVELOP OVER PORTIONS OF MINNESOTA AND NORTHWEST IOWA
OVERNIGHT...WHICH ARE EXPECTED TO MOVE INTO THE OUTLOOK AREA
EARLY THURSDAY MORNING. A VERY WARM AND HUMID LATE SUMMER
AIR MASS IN PLACE ACROSS THE REGION WILL ALLOW STORMS TO
PRODUCE LOCALLY HEAVY RAINFALL...WHICH COULD LEAD TO
LOCALIZED FLOODING IF SEVERAL STORMS TRACK ACROSS THE SAME
AREAS REPEATEDLY. IN ADDITION...WHILE NO WIDESPREAD SEVERE
WEATHER IS EXPECTED...A FEW OF THE STRONGEST THUNDERSTORMS
MAY BE CAPABLE OF PRODUCING WIND GUSTS UP TO 50 MPH AND
SMALL HAIL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

THUNDERSTORMS...SOME OF WHICH COULD BE STRONG TO SEVERE...ARE
LIKELY THURSDAY MORNING...AND AGAIN AND THURSDAY NIGHT WITH
HEAVY RAINFALL LIKELY OCCURRING WITH ANY STRONGER STORMS.

THERE WILL CONTINUE TO BE PERIODIC CHANCES FOR THUNDERSTORMS
FRIDAY THROUGH TUESDAY.

HEAT INDICES COULD EXCEED 100 DEGREES ON FRIDAY...PRIMARILY FOR
AREAS SOUTH OF INTERSTATE 80.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.

&&

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