NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...SOME COULD PRODUCE:
DAMAGING WINDS IN EXCESS OF 60 MPH.
HAIL TO THE SIZE OF QUARTERS.
ISOLATED TORNADOES.
FREQUENT CLOUD TO GROUND LIGHTNING.
HEAVY RAIN.
AREAS AFFECTED AND TIMING:
ISOLATED THUNDERSTORMS CONTINUE TO DEVELOP ACROSS FAR NORTHEAST
ILLINOIS OR ALONG AND EAST OF AN ELGIN TO MILFORD LINE THIS
AFTERNOON.
ADDITIONAL STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP
ACROSS NORTHERN ILLINOIS LATE THIS EVENING THROUGH TONIGHT AND
SLIDE SOUTHEAST ACROSS THE OUTLOOK AREA.
DISCUSSION:
ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP LATE THIS
EVENING THROUGH TONIGHT AS A WEAK UPPER LEVEL WAVE APPROACHES
NORTHERN ILLINOIS AND NORTHWEST INDIANA FROM THE UPPER MIDWEST.
CLOUDS WILL CONTINUE TO CLEAR ACROSS NORTHERN ILLINOIS AND
NORTHWEST INDIANA...WHICH WILL ALLOW THE ATMOSPHERE TO DESTABILIZE
LATE THIS AFTERNOON...STRONG WINDS ALOFT WILL ALLOW STORMS TO
BECOME SEVERE. WITH SOME TURNING IN THE WIND FIELD...AND OLD OUTFLOW
BOUNDARIES FROM EARLIER THUNDERSTORMS...SOME UPDRAFTS COULD BEGIN
TO ROTATE. THUS THE POSSIBILITY FOR ISOLATED TORNADOES...MAINLY
ALONG AND NORTH OF A PONTIAC TO RENSSELAER LINE.
HEAVY RAINFALL WILL ALSO BE POSSIBLE TONIGHT AS THUNDERSTORMS MAY
CONTINUE TO DEVELOP OVER NORTHERN ILLINOIS...MAINLY ALONG AND
NORTH OF A PERU TO STREATOR TO KANKAKEE AND RENSSELAER LINE.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
THUNDERSTORMS ARE LIKELY AGAIN ON WEDNESDAY. THERE IS A SLIGHT
RISK THAT SOME STORMS MAY BE SEVERE...PARTICULARLY OVER EAST
CENTRAL ILLINOIS AND NORTHWEST INDIANA. THE GREATEST THREAT WITH
THESE STORMS WILL BE DAMAGING WINDS AND LARGE HAIL. LOCALLY HEAVY
RAINFALL WILL BE POSSIBLE AS WELL.
THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY ACROSS PORTIONS OF NORTHERN ILLINOIS. THERE WILL BE A
CHANCE OF THUNDERSTORMS ACROSS THE ENTIRE AREA MONDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NECESSARY THIS EVENING THROUGH TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
