FLUS43 KLOT 181652
HWOLOT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1152 AM CDT FRI SEP 18 2015
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
1152 AM CDT FRI SEP 18 2015
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...SOME MAY PRODUCE:
HAIL TO THE SIZE OF QUARTERS.
WINDS GUSTING TO 60 MPH.
BRIEF DOWNPOURS...LEADING TO FLASH FLOODING.
FREQUENT CLOUD TO GROUND LIGHTNING.
AREAS AFFECTED AND TIMING:
SCATTERED THUNDERSTORMS ACROSS WEST CENTRAL ILLINOIS WILL MOVE
INTO NORTHEAST ILLINOIS THROUGH THE AFTERNOON. THE BEST CHANCE
FOR SEVERE STORMS THIS AFTERNOON WOULD BE ALONG AND SOUTH OF
INTERSTATE 80 AND ALONG INTERSTATE 39. ANOTHER ROUND OF MORE
ORGANIZED THUNDERSTORMS WILL OCCUR AREA WIDE BEGINNING MID TO
LATE EVENING AND CONTINUING INTO THE EARLY MORNING HOURS. THE
MOST WIDESPREAD STORMS WILL BE ALONG AND NORTH OF A STREATOR TO
CHICAGO LINE WITH THIS SECOND WAVE.
DISCUSSION:
A COLD FRONTAL BOUNDARY LIES ALONG AND WEST OF THE INTERSTATE 39
CORRIDOR. SEVERAL UPPER LEVEL SHORTWAVES WILL INTERACT WITH THIS
BOUNDARY AND A MOIST AND UNSTABLE AIRMASS SOUTH OF THE
INTERSTATE 80 CORRIDOR TO PRODUCE SCATTERED THUNDERSTORMS LATER
THIS AFTERNOON. LOW CLOUDS NORTH OF THIS AREA MAY LIMIT THE
NORTHERN EXTENT OF STORMS DURING THE DAY TODAY. ANOTHER MORE
ORGANIZED BATCH OF THUNDERSTORMS WILL MOVE THROUGH LATER THIS
EVENING AND TONIGHT AS THE UPPER TROUGH PUSHES THE COLD FRONT
THROUGH THE AREA. GIVEN THE VERY MOIST ENVIRONMENT SOME OF THE
THUNDERSTORMS MAY EASILY PRODUCE HEAVY RAINFALL IN A SHORT
PERIOD OF TIME. ADDITIONALLY SOME STRONGER THUNDERSTORMS MAY BE
CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF QUARTERS AND WIND
GUSTS UP TO 60 MPH.
.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
HIGH WAVES WILL CREATE HAZARDOUS SWIMMING CONDITIONS FOR ILLINOIS
AND INDIANA BEACHES ON SATURDAY AND SATURDAY EVENING. THESE HIGH
WAVES COULD ALSO RESULT IN MINOR COASTAL FLOODING AND EROSION
ALONG THE SOUTHERN SHORES OF LAKE MICHIGAN.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED THIS AFTERNOON THROUGH TONIGHT. THE MOST
LIKELY AREAS LATER THIS AFTERNOON WOULD BE ALONG AND SOUTH OF
INTERSTATE 80 AND ALONG THE INTERSTATE 39 CORRIDOR THIS
AFTERNOON...THEN AREA WIDE LATER TONIGHT.
&&
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