FLUS43 KLOT 201633
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1133 AM CDT SAT JUN 20 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-
1133 AM CDT SAT JUN 20 2015
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
SCATTERED THUNDERSTORMS...SOME OF WHICH MAY PRODUCE:
TORRENTIAL RAINFALL.
FREQUENT CLOUD TO GROUND LIGHTNING.
WIND GUSTS OVER 60 MPH.
QUARTER SIZED HAIL.
AREAS AFFECTED AND TIMING:
AN AREA OF SHOWERS AND THUNDERSTORMS IS EXPECTED TO MOVE
SOUTHEAST ACROSS THE AREA FROM THE EARLY TO MID EVENING...BUT
THE HIGHEST THREAT FOR STRONG TO SEVERE STORMS AND THUNDERSTORMS
PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING COULD PASS WEST OF
A DIXON TO OTTAWA TO PAXTON LINE.
DISCUSSION:
A COLD FRONT WILL SINK SOUTHEAST THROUGH THE REGION THIS
EVENING...WITH AN AREA OF THUNDERSTORMS FORMING AHEAD OF THE
FRONT. THE BEST COMBINATION OF STRONG INSTABILITY AND DEEP LAYER
WIND SHEAR FAVORABLE FOR STRONG TO SEVERE THUNDERSTORMS IS
BECOMING MORE LIKELY TO REMAIN SOUTH AND SOUTHWEST OF THE
CHICAGO AND ROCKFORD METROPOLITAN AREAS. THIS COULD KEEP THE
HIGHER THREAT FOR SCATTERED SEVERE STORMS WEST OF A DIXON TO
OTTAWA TO PAXTON LINE. A MOIST AIRMASS WILL ALSO BE IN PLACE SO
TORRENTIAL DOWNPOURS ARE LIKELY WITH WELL ORGANIZED
THUNDERSTORMS. GIVEN THE RECENT HEAVY RAINFALL...FLASH FLOODING
IS POSSIBLE ALONG WITH RISES ON LOCAL RIVERS AND STREAMS. THE
MAIN SEVERE WEATHER THREATS WILL BE LARGE HAIL AND ISOLATED
DAMAGING WIND GUSTS.
MODERATE TO MAJOR FLOODING CONTINUES ON PORTIONS OF THE KANKAKEE
AND IROQUOIS RIVERS IN NORTHWEST INDIANA...AND MODERATE FLOODING
CONTINUES ON THE ILLINOIS RIVER NEAR LA SALLE.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
THERE ARE PERIODIC THUNDERSTORM CHANCES ACROSS THE ENTIRE OUTLOOK
AREA SUNDAY THROUGH FRIDAY.
PORTIONS OF THE ILLINOIS...IROQUOIS AND KANKAKEE RIVERS WILL
REMAIN IN FLOOD.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED IN PORTIONS OF THE OUTLOOK AREA THIS
EVENING.
&&
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