Note that if drought conditions are not being experienced, or in the case of river flooding or heavy rain, this statement may be used to indicate river flows or flood potential.
000
FGUS73 KLOT 032011
ESFLOT
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
041200-
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
310 PM CDT WED SEP 3 2008
...HEAVY RAIN LIKELY LATE TONIGHT THROUGH FRIDAY MORNING...
HEAVY RAINFALL ASSOCIATED WITH THE INTERACTION OF THE RECENT COLD
FRONT AND THE REMNANTS OF GUSTAV WILL MOVE NORTH THROUGH THE
MIDDLE MISSISSIPPI VALLEY LATE TONIGHT. THE RAIN IS EXPECTED TO
SPREAD INTO NORTH CENTRAL AND NORTHEAST ILLINOIS AS WELL AS
NORTHWEST INDIANA BY EARLY THURSDAY MORNING. RAINFALL...HEAVY AT
TIMES...WILL CONTINUE THROUGH FRIDAY MORNING. THE AREA OF HEAVIEST
RAINFALL WILL EXTEND FROM GALESBURG TO WAUKEGAN...WITH
STORM TOTAL AMOUNTS NEAR 5 INCHES POSSIBLE.
CURRENT SOIL MOISTURE CONDITIONS
RAINFALL DURING AUGUST WAS BELOW NORMAL ACROSS NORTHERN
ILLINOIS WITH SOME AREAS EXPERIENCING WELL BELOW NORMAL RAINFALL. AS
A RESULT...SOIL MOISTURE...ESPECIALLY IN THE UPPER 12 INCHES OF THE
SOIL PROFILE...IS LOW.
RIVER LEVELS
ALL RIVER LOCATIONS IN NORTHERN ILLINOIS AND NORTHWEST INDIANA ARE
CURRENTLY WELL BELOW FLOOD STAGE. MOST FLOWS ON AREA STREAMS ARE
SLIGHTLY BELOW NORMAL AS WELL. THE ONLY EXCEPTION IS WITHIN PORTIONS
OF THE ROCK RIVER BASIN WHERE FLOWS ON SOME STREAMS ARE SLIGHTLY
ABOVE NORMAL FOR THIS TIME OF YEAR BUT STILL WELL BELOW FLOOD STAGE.
IN MANY AREAS THE EXPECTED RAINFALL WILL HELP ALLEVIATE THE DRY
CONDITIONS OF THE LAST 30 DAYS. DRY SOIL CONDITIONS AND LOW WATER
LEVELS IN MOST STREAMS SHOULD PREVENT ANY SIGNIFICANT RUNOFF OR
FLOODING AT LEAST IN THE EARLY STAGES OF THE UPCOMING EVENT. AS THE
RAINFALL EVENT PROGRESSES...STREAMS COULD EXPERIENCE MINOR TO
MODERATE WITHIN BANK RISES. IF RAINFALL AMOUNTS EXCEED 3 TO 5
INCHES WITHIN THE ROCK RIVER BASIN IT MAY RESULT IN TRIBUTARIES OF
THE ROCK RIVER RISING TO NEAR OR EVEN SLIGHTLY ABOVE FLOOD STAGE.
THIS WILL BE MORE LIKELY IF WE RECEIVE VERY HEAVY AMOUNTS OF RAIN IN
A SHORT PERIOD OF TIME.
ANY CHANGE IN THE FORECAST LOCATION OF THE HEAVIEST RAINFALL WILL
HAVE A SIGNIFICANT IMPACT ON WHICH RIVER LOCATIONS EXPERIENCE THE
MOST RESPONSE TO RUNOFF. RESIDENTS IN LOW LYING FLOOD PRONE AREAS
SHOULD CONTINUE TO CLOSELY MONITOR THIS DEVELOPING HEAVY RAIN EVENT.
FOR THE LATEST OBSERVED AND FORECAST RIVER CONDITIONS IN NORTHERN
ILLINOIS AND NORTHWEST INDIANA...GO TO WEATHER.GOV/CHICAGO AND CLICK
ON THE RIVERS AND LAKES TAB ABOVE THE MAIN MAP.
$$
WDM
