A summary of what kind of precip is expected tonight and timing.

.DAY ONE...TONIGHT.

WEATHER HAZARDS EXPECTED:

THUNDERSTORMS...SOME MAY PRODUCE:
SMALL HAIL.
LOCALLY HEAVY RAINFALL AND LOCALIZED FLOODING.
A CHANCE OF ACCUMULATING SNOW AND ICE TONIGHT.

AREAS AFFECTED AND TIMING:

THUNDERSTORMS ARE POSSIBLE OVER THE ENTIRE OUTLOOK AREA.
THUNDERSTORM POTENTIAL WILL DIMINISH NORTH OF I-90 BY AROUND 7
PM CST...ALONG THE I-80 CORRIDOR BY AROUND MIDNIGHT...AND SOUTH
AND WEST OF THE I-55 CORRIDOR BY AROUND 3 OR 4 AM CST.

HEAVY RAINFALL AND LOCALIZED FLOODING IS POSSIBLE ACROSS THE
REGION TONIGHT. RAINFALL AMOUNTS OF ONE TO ONE AND A HALF INCHES
IS POSSIBLE...ESPECIALLY SOUTH OF THE I-80 CORRIDOR.

FREEZING RAIN AND SLEET ARE LIKELY TONIGHT. SLEET ACCUMULATIONS
OF ONE TO 2 TENTHS OF AN INCH ARE POSSIBLE. A GLAZING OF
FREEZING RAIN IS POSSIBLE.

SNOW ACCUMULATIONS OF 2 TO 4 INCHES ARE POSSIBLE OVER THE
NORTHERN TIER COUNTIES ALONG THE WISCONSIN BORDER. 1 TO 2 INCH
ACCUMULATIONS ARE POSSIBLE ROUGHLY BETWEEN I-90 TO I-80. LESS
THAN AN INCH IS EXPECTED SOUTH OF I-80.

DISCUSSION:

A STRONG STORM SYSTEM APPROACHING THE REGION WILL BRING
SCATTERED THUNDERSTORMS PRODUCING LOCALLY HEAVY RAINFALL
FROM THE LATE AFTERNOON HOURS INTO THE NIGHT. IN ADDITION TO
CLOUD TO GROUND LIGHTNING...SOME OF THE STORMS MAY PRODUCE SMALL
HAIL.

ADDITIONAL LOCALLY HEAVY RAINFALL IS POSSIBLE
OVERNIGHT...ESPECIALLY SOUTH OF THE I-80 CORRIDOR. LOCALIZED
FLOODING IS POSSIBLE...MAINLY IN LOW LYING AND POOR DRAINAGE
AREAS.

AS COLDER AIR MOVES IN FROM THE NORTH TONIGHT...RAIN WILL CHANGE
TO A PERIOD OF SLEET AND FREEZING RAIN BEFORE CHANGING OVER TO
SNOW. LIGHT SNOW WILL LINGER INTO MONDAY MORNING.

RECENT RAINFALL HAS LEFT MANY AREA RIVERS NEAR BANKFULL.


.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

PORTIONS OF THE ILLINOIS AND KANKAKEE RIVERS ARE FORECAST TO
RISE ABOVE FLOOD STAGE BY MONDAY AFTERNOON.

HEAVY RAINFALL OCCURRING SUNDAY WILL LEAD TO ADDITIONAL RISES ON
MANY AREA RIVERS...REACHING OR EXCEEDING BANKFULL.