Wednesday, September 10, 2014

Hazardous Weather Outlook for Mchenry Co., IL

FLUS43 KLOT 100940
HWOLOT

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
440 AM CDT WED SEP 10 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-
440 AM CDT WED SEP 10 2014 /540 AM EDT WED SEP 10 2014/

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

.DAY ONE...TODAY AND TONIGHT.

WEATHER HAZARDS EXPECTED:

THUNDERSTORMS...SOME OF WHICH MAY PRODUCE:

HEAVY RAINFALL...WHICH COULD LEAD TO LOCALIZED FLOODING.
HAIL TO 1 INCH IN DIAMETER.
WIND GUSTS TO 60 MPH.
FREQUENT CLOUD TO GROUND LIGHTNING.

AREAS AFFECTED AND TIMING:

WIDESPREAD MODERATE TO LOCALLY HEAVY RAIN AND THUNDERSTORMS
WERE OVERSPREADING THE AREA EARLY THIS MORNING. ADDITIONAL
STRONGER STORMS MAY FORM THIS AFTERNOON ALONG AND AHEAD OF A
COLD FRONT...WITH SOME POTENTIAL FOR SEVERE THUNDERSTORMS THIS
AFTERNOON GENERALLY SOUTHEAST OF ABOUT A PONTIAC ILLINOIS TO GARY
INDIANA LINE. RAIN THEN ENDS FROM THE NORTHWEST DURING THE LATE
AFTERNOON AND EARLY EVENING HOURS.

DISCUSSION:

LOW PRESSURE CONTINUES TO DEEPEN AS IT MOVES FROM EASTERN
IOWA THROUGH WISCONSIN AND THE GREAT LAKES TODAY AND THIS
EVENING. MOISTURE LADEN SOUTH WINDS WILL RESULT IN WIDESPREAD
RAIN AND THUNDERSTORMS ACROSS THE AREA THIS MORNING INTO
THIS AFTERNOON...BEFORE SHIFTING EAST OF THE AREA TONIGHT.
RAINFALL AMOUNTS OF 1.50-2.00 INCHES WILL BE COMMON ACROSS
THE AREA BY THE TIME RAIN ENDS...WITH SOME LOCAL AREAS
PERHAPS PICKING UP IN EXCESS OF 2 INCHES WHERE SEVERAL STORMS
TRACK REPEATEDLY. THE THREAT OF SEVERE WEATHER WILL INCREASE
THIS AFTERNOON BOTH FROM INCREASING INSTABILITY WITH AFTERNOON
HEATING...AND FROM INCREASING MID AND UPPER LEVEL WINDS FROM
AN APPROACHING UPPER DISTURBANCE. SOUTHERN PARTS OF THE
OUTLOOK AREA SOUTH OF ABOUT A PONTIAC TO GARY LINE WILL BE
MOST AT RISK OF SEVERE STORMS AS THE COLD FRONT APPROACHES
THIS AFTERNOON.

HIGH WAVES WILL CREATE HAZARDOUS SWIMMING CONDITIONS AT LAKE MICHIGAN
BEACHES THIS MORNING ALONG THE ILLINOIS SHORE...AND AGAIN ALONG BOTH
THE ILLINOIS AND INDIANA SHORES LATE TONIGHT.

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

HIGH WAVES WILL CREATE HAZARDOUS SWIMMING CONDITIONS AT LAKE
MICHIGAN BEACHES FROM THURSDAY THROUGH SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.

&&

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