NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TONIGHT.
WEATHER HAZARDS EXPECTED:
HEAVY RAINFALL...WHICH MAY LEAD TO LOCALIZED FLOODING
CLOUD TO GROUND LIGHTNING
MARBLE SIZED HAIL
DAMAGING WIND GUSTS.
AREAS AFFECTED AND TIMING:
NORTHEAST ILLINOIS ALONG AND SOUTH OF A ROCKFORD ILLINOIS TO
CALUMET CITY LINE LATE THIS EVENING INTO THE EARLY MORNING
HOURS.
DISCUSSION:
A WARM FRONT LIFTING NORTH ACROSS THE FORECAST AREA THIS EVENING
WILL BE THE FOCAL POINT FOR POTENTIALLY STRONG THUNDERSTORMS
LATE TONIGHT THROUGH EARLY SATURDAY. WHILE THERE IS SOME ONGOING
UNCERTAINTY AS TO THE DETAILS...THE BEST CHANCES FOR SEVERE
WEATHER ARE ACROSS THE SOUTHERN AND WESTERN PORTIONS OF THE
OUTLOOK AREA IN PARTICULAR. THUNDERSTORM CLUSTERS AND
POTENTIALLY ISOLATED SUPERCELLS ARE THE EXPECTED MODE
EARLY...HOWEVER LATE TONIGHT AS A LOW LEVEL JET STRENGTHENS...AN
MCS MAY DEVELOP BRINGING AN ADDITIONAL THREAT FOR HEAVY RAINFALL
AND DANGEROUS WINDS.
PORTIONS OF THE KANKAKEE RIVER IN NORTHWEST INDIANA AND THE
ILLINOIS RIVER IN LA SALLE COUNTY WILL REMAIN IN FLOOD.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
THERE WILL BE PERIODIC CHANCES FOR SHOWERS AND THUNDERSTORMS
THROUGH THE WEEKEND AND INTO THE MIDDLE OF NEXT WEEK.
PORTIONS OF THE KANKAKEE RIVER IN NORTHWEST INDIANA AND THE
ILLINOIS RIVER IN LA SALLE COUNTY WILL REMAIN IN FLOOD. IN
ADDITION...THE POTENTIAL FOR HEAVY RAINFALL OVER THE NEXT SEVERAL
DAYS MAY RESULT IN FURTHER INCREASES IN STREAM FLOWS AND MAY
INCREASE THE POSSIBILITY OF FLOODING ALONG OTHER AREA RIVERS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NECESSARY TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
