NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
INTENSE HEAT.
THUNDERSTORMS...SOME MAY PRODUCE:
TORRENTIAL RAINFALL.
WINDS OVER 60 MPH.
AND FREQUENT CLOUD TO GROUND LIGHTNING.
AREAS AFFECTED AND TIMING:
INTENSE HEAT IS LIKELY THROUGH EARLY AFTERNOON AREA WIDE...WITH
HEAT CONTINUING THROUGH TONIGHT SOUTH OF INTERSTATE 80.
THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON.
THERE IS A BETTER CHANCE OF STORMS AND LOCALLY HEAVY RAINFALL
AFTER MIDNIGHT TONIGHT...ESPECIALLY NORTH OF INTERSTATES 88 AND
290.
DISCUSSION:
HEAT INDICES WILL AGAIN CLIMB TO OVER 100 DEGREES TODAY...WITH
READINGS OVER 110 POSSIBLE SOUTH OF INTERSTATE 80.
A WEAK FRONT WILL MOVE INTO THE AREA THIS AFTERNOON...BRINGING
WITH IT SOME SLIGHT RELIEF TO THE HEAT AND HUMIDITY TO FAR
NORTHERN ILLINOIS. IN ADDITION...THERE IS A SMALL CHANCE THAT
THUNDERSTORMS COULD DEVELOP ALONG THE FRONT THIS AFTERNOON.
GIVEN THE EXTREMELY UNSTABLE ATMOSPHERE...ANY STORM THAT DOES
DEVELOP WOULD HAVE SOME POTENTIAL TO BE SEVERE...BUT THE THREAT
APPEARS QUITE LIMITED AT THIS TIME.
A COMPLEX OF THUNDERSTORMS COULD DEVELOP OVER IOWA THIS EVENING
AND TRACK INTO SOUTHERN WISCONSIN OR NORTHERN ILLINOIS LATE
TONIGHT. WHILE THERE WOULD BE SOME POTENTIAL FOR LOCALLY
DAMAGING WINDS ALONG THE LEADING EDGE OF THE STORMS...THE
GREATER THREAT WOULD LIKELY BE HEAVY RAINFALL AND POSSIBLY EVEN
LOCALIZED FLASH FLOODING. THERE IS A GREAT DEAL OF UNCERTAINTY
ABOUT WHETHER THIS CLUSTER OF STORMS WILL EVEN FORM...LET ALONE
WHERE IT WILL TRACK...SO THE THREAT FOR THUNDERSTORMS TONIGHT
IS LOW BUT LATER FORECASTS SHOULD STILL BE MONITORED.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
HEAT INDICES OVER 100 DEGREES ARE LIKELY FRIDAY SOUTH OF
INTERSTATE 80 AND ACROSS MUCH OF THE AREA OVER THE WEEKEND.
THERE WILL ALSO BE A THREAT FOR A PERIOD OR TWO OF THUNDERSTORMS
FRIDAY INTO THE WEEKEND.
THERE IS A SLIGHT CHANCE OF THUNDERSTORMS AGAIN BY NEXT
WEDNESDAY.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED THIS AFTERNOON OR TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
