WEATHER HAZARDS EXPECTED:


HEAT INDICES AROUND 105 DEGREES THIS AFTERNOON.


CHANCE OF THUNDERSTORMS...SOME COULD PRODUCE:

DAMAGING WINDS IN EXCESS OF 60 MPH.

HEAVY RAIN.

FREQUENT LIGHTNING.


AREAS AFFECTED AND TIMING:


HEAT INDEX VALUES WILL RISE TO AROUND 105 DEGREES LATE THIS

AFTERNOON FOR MOST OF NORTH CENTRAL AND NORTHEAST ILLINOIS...AND

NORTHWEST INDIANA.


THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. A FEW OF THE STORMS

MAY BECOME SEVERE TONIGHT.


DISCUSSION:


VERY WARM AND HUMID AIR OVER THE AREA WILL RESULT IN HEAT INDEX

VALUES IN THE 100 TO 110 DEGREE RANGE LATE THIS AFTERNOON.


UPPER LEVEL DISTURBANCES PIVOTING AROUND A MASSIVE DOME OF HEAT

OVER THE CENTRAL PLAINS HAS ALLOWED THUNDERSTORMS TO OCCASIONALLY

DEVELOP AND SLIDE SOUTHEAST ACROSS THE WESTERN GREAT LAKES.

ADDITIONAL THUNDERSTORMS WILL DEVELOP THIS EVENING AND APPROACH

NORTHERN ILLINOIS AND NORTHWEST INDIANA 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 AROUND 105 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.

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