NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
HEAT INDICES OVER 100 DEGREES.
CHANCE OF THUNDERSTORMS...SOME COULD PRODUCE:
DAMAGING WINDS IN EXCESS OF 60 MPH.
HEAVY RAIN.
FREQUENT LIGHTNING.
AREAS AFFECTED AND TIMING:
HEAT INDICES OVER 100 DEGREES ARE EXPECTED THIS
AFTERNOON...PARTICULARLY NEAR AND WEST OF THE INTERSTATE 39
CORRIDOR.
THUNDERSTORMS ARE POSSIBLE LATE THIS EVENING AND ESPECIALLY
OVERNIGHT...WITH THE GREATEST THREAT EXISTING NORTH OF
INTERSTATES 80.
DISCUSSION:
AFTERNOON HEAT INDICES OF 100 TO 105 ARE EXPECTED OVER NORTH
CENTRAL ILLINOIS.
A WEAK UPPER LEVEL DISTURBANCE PIVOTING AROUND A MASSIVE DOME
OF HEAT OVER THE CENTRAL PLAINS COULD TRIGGER THE DEVELOPMENT
OF A CLUSTER OF THUNDERSTORMS TONIGHT OVER WISCONSIN. IF THIS
THUNDERSTORM CLUSTER DOES INDEED MATERIAL...THEN IT WOULD
LIKELY DIVE SOUTHEAST INTO NORTHERN ILLINOIS LATE
TONIGHT...BRINGING WITH IT A POTENTIAL FOR DAMAGING WINDS.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
A PERIOD OR TWO OF THUNDERSTORMS IS POSSIBLE MONDAY INTO
TUESDAY...IF STORMS DO INDEED AFFECT THE AREA THEN THEY WOULD
BRING WITH THEM A THREAT OF DAMAGING WINDS.
HEAT INDICES OF 100 TO 105 ARE POSSIBLE MONDAY AND
TUESDAY...WITH HEAT INDICES NEAR OR ABOVE 105 DEGREES POSSIBLE
WEDNESDAY...THURSDAY...AND POSSIBLY INTO FRIDAY.
THERE IS A SLIGHT CHANCE OF THUNDERSTORMS AGAIN BY LATE
THURSDAY THROUGH SATURDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
