NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...SOME OF WHICH COULD PRODUCE:
HAIL TO ONE INCH.
STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
LOCALLY HEAVY RAINFALL.
AREAS AFFECTED AND TIMING:
NORTH OF A LINE FROM LA SALLE NORTHEAST TO WAUKEGAN THIS
AFTERNOON AND ALL OF NORTHERN ILLINOIS AND NORTHWEST INDIANA LATE
TONIGHT INTO EARLY MONDAY MORNING.
DISCUSSION:
A SERIES OF MID LEVEL DISTURBANCES WILL MOVE INTO PORTIONS OF
THE UPPER MIDWEST TODAY AS LOW LEVEL MOISTURE AND INSTABILITY
INCREASES. THIS WILL HELP GENERATE SHOWERS AND THUNDERSTORMS IN
AREAS FROM NORTHEAST IOWA INTO SOUTHERN WISCONSIN. WITH
TIME...SOME OF THESE THUNDERSTORMS COULD SHIFT SOUTH INTO
NORTHERN ILLINOIS AND BRING AN ISOLATED THREAT FOR LARGE HAIL
AND STRONG DAMAGING WINDS. ANOTHER STRONG MID LEVEL WAVE WILL
MOVE ACROSS THE REGION LATE TONIGHT AND HELP THE FURTHER
DEVELOPMENT OF THUNDERSTORMS...SOME OF WHICH COULD TRANSITION
INTO A LARGER COMPLEX. IF THIS OCCURS...ALL OF NORTHERN ILLINOIS
AND NORTHWEST INDIANA COULD OBSERVE THUNDERSTORMS LATE TONIGHT
INTO EARLY MONDAY MORNING. STRONG DAMAGING WIND GUSTS WOULD BE
THE PRIMARY THREAT FROM THIS ROUND OF THUNDERSTORMS.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS MONDAY THROUGH
THE END OF THE WEEK...WITH SEVERE WEATHER A POSSIBILITY ONCE
AGAIN ON MONDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED LATE TONIGHT AND ON MONDAY.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
