FLUS43 KLOT 061951
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
251 PM CDT SUN JUL 6 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-
251 PM CDT SUN JUL 6 2014 /351 PM EDT SUN JUL 6 2014/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS EVENING AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...WHICH MAY PRODUCE:
WINDS IN EXCESS OF 60 MPH.
QUARTER SIZE HAIL.
FREQUENT CLOUD TO GROUND LIGHTNING.
TORRENTIAL DOWNPOURS.
AREAS AFFECTED AND TIMING:
THERE IS A SLIGHT CHANCE FOR THE DEVELOPMENT OF A FEW ISOLATED
STORMS EARLY THIS EVENING. HOWEVER...THE MAIN FOCUS FOR SEVERE
THUNDERSTORMS WILL SPREAD SOUTHEASTWARD ACROSS NORTHERN
ILLINOIS AFTER 7 PM CDT AND CONTINUE ACROSS EAST CENTRAL
ILLINOIS AND NORTHWESTERN INDIANA DURING THE LATE EVENING AND
OVERNIGHT HOURS.
DISCUSSION:
A COLD FRONT WILL DROP SOUTHEASTWARD ACROSS SOUTHERN WISCONSIN
EARLY THIS EVENING. THE AIRMASS TO THE SOUTH OF THIS FRONT IS
EXPECTED TO BECOME VERY WARM AND MOIST...RESULTING IN UNSTABLE
CONDITIONS ACROSS THE AREA. HOWEVER THE CHALLENGE REMAINS WITH
TIMING...GIVEN THE DEVELOPMENT OF A WARM LAYER ALOFT THAT IS
EXPECTED TO PERSIST THROUGH EARLY THIS EVENING. THIS WARM LAYER
MAY LIMIT THE COVERAGE AND DEVELOPMENT OF ISOLATED STORMS UNTIL
LATER THIS EVENING...OR LIMIT CONVECTION TO JUST AHEAD OF THE
FRONTAL BOUNDARY. AS AN UPPER LEVEL DISTURBANCE APPROACHES THE
AREA THIS EVENING...THUNDERSTORMS WILL DEVELOP
ACROSS SOUTHERN WISCONSIN BY LATE THIS AFTERNOON. THE STORMS MAY
THEN FORM INTO SOUTHEASTWARD MOVING LINES CAPABLE OF PRODUCING
STRONG DAMAGING WINDS IN EXCESS OF 60 MPH ACROSS NORTHERN
ILLINOIS INTO THIS EVENING. ALTHOUGH STRONG WINDS WILL BE THE
PRIMARY SEVERE THREAT...THERE IS ALSO A SECONDARY THREAT FOR
QUARTER SIZE HAIL.
THESE STORMS MAY CONTINUE TO BE SEVERE AS THEY MOVE ACROSS
EAST CENTRAL ILLINOIS AND NORTHWESTERN INDIANA LATER IN THE
EVENING AND OVERNIGHT. HOWEVER...THERE IS SOME QUESTION AS TO
WHETHER OR NOT THEY WILL BEGIN WEAKENING PRIOR TO REACHING
THESE AREAS. THEREFORE THE SEVERE THREAT IS MORE UNCERTAIN FOR
AREAS TO THE SOUTHEAST OF THE CHICAGO METRO AREA. TORRENTIAL
DOWNPOURS ARE EXPECTED WITH THESE STORMS...BUT DUE TO THE
FAIRLY QUICK MOVEMENT...EXTREME RAINFALL AMOUNTS ARE UNLIKELY.
PORTIONS OF THE ILLINOIS RIVER WILL REMAIN IN FLOOD TODAY.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS LATE MONDAY NIGHT
THROUGH WEDNESDAY AND AGAIN SATURDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED AFTER 6 PM CDT ACROSS ALL OF NORTHERN ILLINOIS
AND NORTHWEST INDIANA.
&&
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