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:
ALL OF NORTHERN ILLINOIS AND NORTHWEST INDIANA THIS AFTERNOON.
HOWEVER...SLIGHTLY BETTER POTENTIAL WILL BE MAINLY SOUTH OF THE
ILLINOIS AND KANKAKEE RIVERS.
DISCUSSION:
CLOUD COVER FROM THIS MORNINGS THUNDERSTORMS MAY HELP PREVENT
THUNDERSTORMS ACROSS NORTHERN ILLINOIS THIS AFTERNOON.
HOWEVER...CLOUD COVER REMAINS LOW ACROSS CENTRAL ILLINOIS SOUTH
OF THE OUTFLOW BOUNDARY. IT APPEARS THAT THIS MAY BE THE AREA
MORE SUSCEPTIBLE TO ADDITIONAL THUNDERSTORMS THIS AFTERNOON.
HOWEVER...DUE TO THE LACK OF ANY SIGNIFICANT LARGE SCALE FORCING
FOR ASCENT...UNCERTAINTY IS HIGH IN THUNDERSTORM POTENTIAL THIS
AFTERNOON.
TEMPERATURES ARE FORECAST TO REACH THE LOWER 90S WITH HIGH
HUMIDITY CONTRIBUTING TO HEAT INDEX VALUES OF 105 TO 110 DEGREES
SOUTH OF A LINE FROM LIVINGSTON COUNTY IN ILLINOIS EAST TO JASPER
COUNTY IN INDIANA...WITH ALL OTHER AREAS IN NORTHERN ILLINOIS AND
NORTHWEST INDIANA FORECAST TO OBSERVE HEAT INDEX VALUES OF AROUND
100 DEGREES.
THERE IS A MODERATE RISK OF RIP CURRENTS THIS AFTERNOON DUE TO THE
FLUCTUATIONS OF LAKE LEVELS ASSOCIATED WITH A SEICHE.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS TUESDAY THROUGH
SATURDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS WILL MAY BE NEEDED THIS AFTERNOON.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
