NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
HEAT INDICES 100 TO 110 DEGREES TODAY.
CHANCE OF THUNDERSTORMS...SOME COULD PRODUCE:
DAMAGING WINDS IN EXCESS OF 60 MPH.
HEAVY RAIN.
FREQUENT LIGHTNING.
AREAS AFFECTED AND TIMING:
THE HEAT INDEX WILL APPROACH 100 DEGREES BY MIDDAY ACROSS MOST OF
NORTH CENTRAL AND NORTHEAST ILLINOIS...AND IN NORTHWEST INDIANA BY
EARLY AFTERNOON. AREAS WEST OF A MARENGO TO ROCHELLE TO ROCK FALLS
LINE MAY EXCEED 110 DEGREES DURING THE MID AFTERNOON.
THERE IS A CHANCE OF THUNDERSTORMS LATE THIS MORNING THROUGH THIS
AFTERNOON...AND AGAIN TONIGHT. A FEW OF THE STORMS MAY BECOME
SEVERE THIS AFTERNOON AND TONIGHT.
DISCUSSION:
VERY WARM AND HUMID AIR OVER THE AREA WILL RESULT IN HEAT INDEX
VALUES IN THE 100 TO 110 DEGREE RANGE THIS AFTERNOON.
UPPER LEVEL DISTURBANCES PIVOTING AROUND A MASSIVE DOME OF HEAT
OVER THE CENTRAL PLAINS HAS ALLOWED THUNDERSTORMS TO DEVELOP THIS
MORNING AND MAY CONTINUE THROUGH THIS AFTERNOON AND TONIGHT. A
COLD FRONT WILL DROP SOUTH INTO NORTHERN ILLINOIS AND FAR
NORTHWEST INDIANA BY DAYBREAK TUESDAY.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
PERIODIC CHANCES FOR THUNDERSTORMS WILL OCCUR FROM THURSDAY
THROUGH SUNDAY.
HEAT INDICES OF 100 TO 110 ARE POSSIBLE EACH DAY TUESDAY THROUGH
SUNDAY...EXCEPT WINDS OFF OF LAKE MICHIGAN WILL KEEP AREAS NEAR
THE LAKE FROM GETTING QUITE AS HOT TUESDAY AND THURSDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED THIS LATER AFTERNOON OR TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
