Hazardous Weather Outlook for Mchenry Co., IL

FLUS43 KLOT 140934
HWOLOT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
434 AM CDT FRI AUG 14 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-
434 AM CDT FRI AUG 14 2015

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

.DAY ONE...TODAY AND TONIGHT.

WEATHER HAZARDS EXPECTED:

ISOLATED THUNDERSTORMS...WHICH MAY PRODUCE:

CLOUD TO GROUND LIGHTNING.
BRIEF HEAVY DOWNPOURS.
ISOLATED WIND GUSTS TO 50 MPH.
ISOLATED PENNY TO QUARTER SIZE HAIL.

AREAS AFFECTED AND TIMING:

AREAS MAINLY NORTHEAST OF A ROCKFORD...TO JOLIET...TO
RENSSELAER LINE...THIS AFTERNOON AND EARLY THIS EVENING ACROSS
NORTHERN ILLINOIS AND MAINLY THIS EVENING ACROSS NORTHWEST
INDIANA.

DISCUSSION:

WARM AND HUMID CONDITIONS WILL ALLOW THE ATMOSPHERE TO
DESTABILIZE ACROSS THE AREA THIS AFTERNOON INTO EARLY THIS
EVENING. ONE OF A SERIES OF MID LEVEL DISTURBANCES WILL
MOVE SOUTHEAST ACROSS THE WESTERN GREAT LAKES REGION LATE
THIS AFTERNOON AND THIS EVENING...AND MAY RESULT IN THE
DEVELOPMENT OF ISOLATED THUNDERSTORMS ESPECIALLY NORTH AND
NORTHEAST OF THE OUTLOOK AREA. WHILE LITTLE LOW LEVEL FOCUS
FOR THUNDERSTORM DEVELOPMENT IS EXPECTED LOCALLY...ISOLATED
THUNDERSTORMS OVER WISCONSIN AND LAKE MICHIGAN MAY PRODUCE
OUTFLOW BOUNDARIES WHICH COULD INITIATE ADDITIONAL ISOLATED
THUNDERSTORM DEVELOPMENT OVER PARTS OF NORTHERN ILLINOIS AND
NORTHWEST INDIANA. WHILE NOT EXPECTED TO BE NUMEROUS...
ISOLATED STRONG STORMS ARE POSSIBLE DUE TO THE DEGREE OF
INSTABILITY AND MODERATE MID LEVEL WINDS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

AN ISOLATED THUNDERSTORM OR TWO ARE POSSIBLE SATURDAY AFTERNOON
MAINLY NEAR THE LAKE MICHIGAN LAKE BREEZE...AND ACROSS PARTS OF
EAST CENTRAL ILLINOIS AND NORTHWEST INDIANA.

THERE IS A CHANCE OF PERIODIC THUNDERSTORMS MONDAY THROUGH
THURSDAY NEXT WEEK.



.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT...
HOWEVER ANY REPORTS OF SIGNIFICANT WIND...HAIL OR RAINFALL FROM
ANY STRONG ISOLATED THUNDERSTORMS THIS AFTERNOON OR EARLY THIS
EVENING ARE WELCOMED.

&&

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