NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
ISOLATED THUNDERSTORMS...SOME MAY PRODUCE:
LOCALLY HEAVY DOWNPOURS.
CLOUD TO GROUND LIGHTNING.
PEA SIZE HAIL.
WIND GUSTS IN EXCESS OF 35 MPH.
AREAS AFFECTED AND TIMING:
MUCH OF NORTHEAST ILLINOIS AND NORTHWEST INDIANA...PARTICULARLY
ALONG AND NORTHEAST OF ROUGHLY A STERLING ILLINOIS TO RENSSELAER
INDIANA LINE BETWEEN APPROXIMATELY NOON AND 8 PM CDT.
DISCUSSION:
A SLOW MOVING MID LEVEL DISTURBANCE WILL CONTINUE TO DRIFT EAST
ACROSS THE REGION TODAY. THE COMBINATION OF WEAK LIFT GENERATED
BY THIS DISTURBANCE...AND WEAK INSTABILITY GENERATED BY DAYTIME
HEATING MAY RESULT IN ISOLATED TO SCATTERED THUNDERSTORM
DEVELOPMENT FROM MIDDAY THROUGH EARLY EVENING. MODEST DEEP
SHEAR COMBINED WITH RELATIVELY WEAK INSTABILITY MAY SUPPORT
BRIEF DOWNPOURS...WIND GUSTS ABOVE 35 MPH AND SOME PEA SIZED
HAIL FROM THE STRONGER UPDRAFTS. ANY ISOLATED THUNDERSTORMS
SHOULD DISSIPATE BY EARLY EVENING WITH THE LOSS OF DAYTIME
HEATING.
PORTIONS OF THE KANKAKEE RIVER IN NORTHWEST INDIANA AND THE
ILLINOIS RIVER IN LA SALLE COUNTY WILL REMAIN IN FLOOD.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
A WARM FRONT WILL LIFT SLOWLY INTO THE REGION FRIDAY AND FRIDAY
NIGHT...AND IS EXPECTED TO LINGER ACROSS THE OUTLOOK AREA THROUGH
THE WEEKEND. THIS WILL RESULT IN PERIODIC THUNDERSTORM CHANCES
INTO THE FIRST PART OF NEXT WEEK. WARMER AND MORE HUMID WEATHER
SOUTH OF THIS FRONTAL ZONE WILL SUPPORT THE POTENTIAL FOR SOME
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS AND
LARGE HAIL FRIDAY AND SATURDAY...ALONG WITH THE POTENTIAL FOR
LOCALLY HEAVY RAINFALL.
PORTIONS OF THE KANKAKEE RIVER IN NORTHWEST INDIANA AND THE
ILLINOIS RIVER IN LA SALLE COUNTY WILL REMAIN IN FLOOD. IN
ADDITION...THE POTENTIAL FOR HEAVY RAINFALL OVER THE NEXT SEVERAL
DAYS MAY RESULT IN FURTHER INCREASES IN STREAM FLOWS AND MAY
INCREASE THE POSSIBILITY OF FLOODING ALONG OTHER AREA RIVERS.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
