NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...OVERNIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...SOME MAY PRODUCE:
HEAVY RAINFALL...WHICH MAY CAUSE LOCALIZED FLOODING.
CLOUD TO GROUND LIGHTNING.
AND PENNY SIZED HAIL.
AREAS AFFECTED AND TIMING:
THUNDERSTORMS WILL OVERSPREAD MUCH OF NORTHERN ILLINOIS FROM THE
WEST AND SOUTHWEST OVERNIGHT...POSSIBLY REACHING LAKE MICHIGAN
AND THE INDIANA BORDER TOWARD DAWN.
DISCUSSION:
A CLUSTER OF SHOWERS AND HEAVY THUNDERSTORMS ORGANIZING OVER
EASTERN IOWA AND WEST CENTRAL ILLINOIS LATE TUESDAY EVENING WILL
MOVE SLOWLY EASTWARD INTO NORTH CENTRAL AND EVENTUALLY NORTHEAST
ILLINOIS OVERNIGHT. THE THUNDERSTORMS WILL BE FEEDING ON A VERY
MOIST AIRMASS WEST OF THE AREA AND WILL BE MOVING RELATIVELY
SLOWLY...BOTH OF WHICH FAVOR THE POTENTIAL FOR HEAVY AND
POSSIBLY EXCESSIVE RAINFALL TOTALS WHICH COULD RESULT IN
LOCALIZED FLASH FLOODING. THE GREATEST THREAT OF HEAVY RAINFALL
AND FLASH FLOODING APPEARS TO BE SOUTHWEST OF A DIXON TO
KANKAKEE LINE. IN ADDITION TO HEAVY RAINFALL...THE MORE INTENSE
STORMS WILL ALSO POSE A THREAT OF HAIL UP TO THE SIZE OF PENNIES
AND FREQUENT CLOUD TO GROUND LIGHTNING.
PORTIONS OF THE KANKAKEE RIVER IN NORTHWEST INDIANA AND ILLINOIS
RIVER IN LA SALLE COUNTY WILL REMAIN IN FLOOD.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
SHOWERS AND EMBEDDED THUNDERSTORMS ARE LIKELY WEDNESDAY. LOCALLY
HEAVY RAINFALL WILL BE POSSIBLE WITH SOME STORMS.
SOILS REMAIN NEARLY SATURATED ACROSS THE OUTLOOK AREA...
WHICH COMBINED WITH LOCALLY HEAVY RAINFALL MAY RESULT
IN LOCALIZED FLOODING.
THERE IS A MODERATE RISK OF RIP CURRENTS AT ILLINOIS BEACHES
ALONG LAKE MICHIGAN WEDNESDAY.
PORTIONS OF THE KANKAKEE RIVER IN NORTHWEST INDIANA AND ILLINOIS
RIVER IN LA SALLE COUNTY WILL REMAIN IN FLOOD.
THERE WILL BE PERIODS OF THUNDERSTORMS FROM FRIDAY NIGHT THROUGH
TUESDAY INTERSPERSED WITH DRY PERIODS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
