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FGUS73 KLOT 041656
ESFLOT
ILC031-053-063-075-091-099-105-197-INC007-073-089-111-127-050200-
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO IL
1156 AM CDT FRI APR 4 2025
..RAINFALL MAY LEAD TO LOCALIZED FLOODING TONIGHT
A PERIOD OF SOAKING RAINFALL IS EXPECTED THIS AFTERNOON AND TONIGHT
ACROSS THE MISSISSIPPI RIVER VALLEY. A SHARP GRADIENT IN RAINFALL
TOTALS IS EXPECTED ALONG THE NORTH EDGE OF THIS SWATH OF RAINFALL,
WITH AMOUNTS GENERALLY INCREASING FROM NORTHWEST TO SOUTHEAST. WHILE
THE HIGHEST PROBABILITY OF FLOOD-PRODUCING RAINFALL APPEARS TO BE
JUST TO THE SOUTH OF OUR FORECAST AREA IN EAST CENTRAL ILLINOIS AND
WEST CENTRAL INDIANA, FLOODING REMAINS POSSIBLE IN THE KANKAKEE
RIVER BASIN DOWNSTREAM TO THE ILLINOIS RIVER VALLEY.
RECENT RAINFALL HAS LED TO SATURATED SOILS AND ELEVATED RIVER
LEVELS, ESPECIALLY ALONG AND SOUTHEAST OF INTERSTATE 55. AS A
RESULT, RAINFALL IN EXCESS OF 1 INCH MAY LEAD TO LOCALIZED FLOODING
OF YARDS, FIELDS, CREEKS, DITCHES, AND OTHER POOR DRAINAGE AREAS.
RAINFALL EXCEEDING 2 INCHES MAY LEAD TO MORE WIDESPREAD FLOODING OF
RIVERS AND STREAMS. THE CHANCE FOR RAINFALL EXCEEDING 1 INCH IS
AROUND 30 PERCENT OR LOWER ALONG AND TO THE NORTHWEST OF I-55, FROM
NEAR PONTIAC, IL, TO NEAR GARY, IN. THE CHANCE FOR RAINFALL
EXCEEDING 1 INCH IS AROUND 70 PERCENT OR HIGHER SOUTHEAST OF A LINE
FROM PAXTON, IL TO REMINGTON, IN, AND THE CHANCE FOR RAINFALL
EXCEEDING 2 INCHES IS AROUND 10 TO 20 PERCENT IN THIS AREA.
RIVER FORECASTS ISSUED THIS MORNING ARE BASED UPON THE MOST LIKELY
FORECASTED RAINFALL THROUGH SUNDAY MORNING. BASED UPON THESE
FORECASTS, MULTIPLE RIVERS ALONG THE KANKAKEE, IROQUOIS, AND
ILLINOIS RIVERS MAY SEE RISES TO NEAR FLOOD STAGE AND SEVERAL DAYS
OF ELEVATED WATER LEVELS. IF RAINFALL OVER THE NEXT TWO DAYS ENDS UP
SIGNIFICANTLY HIGHER OR LOWER THAN CURRENTLY FORECASTED, RIVER
LEVELS WILL ALSO DEVIATE FROM FORECASTS ACCORDINGLY. DUE TO THE
SENSITIVITY OF WATERWAYS IN THE KANKAKEE RIVER BASIN TO HEAVY
RAINFALL DUE TO ELEVATED SOIL MOISTURE, RELATIVELY SMALL ADJUSTMENTS
TO THE LOCATION OF HEAVY RAINFALL BANDS MAY CAUSE SIGNIFICANT
CHANGES TO THE EVENTUAL RIVER CRESTS.
THIS OUTLOOK MEANS THAT ELEVATED WATER LEVELS AND POTENTIAL IMPACTS
ARE POSSIBLE, BUT NOT YET CERTAIN. PERSONS WITH INTERESTS ALONG AREA
WATERWAYS SHOULD CONTINUE TO MONITOR THE LATEST FORECAST UPDATES.
THIS OUTLOOK IS SCHEDULED TO BE UPDATED BY THIS EVENING.
WSL
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