HYDROLOGIC OUTLOOK
Warning Issue Date: 936 PM CST THU DEC 24 2009
THE ILLINOIS RIVER.
THE FOLLOWING FLOOD FORECASTS ARE BASED PRIMARILY ON EXPECTED
RAINFALL OVER THE NEXT 24 HOURS. THERE IS SOME UNCERTAINTY IN THE
CREST FORECASTS AT THIS TIME AND SO THEY WILL LIKELY BE ADJUSTED ONCE
THE RAINFALL IS OBSERVED.
FOR THE ILLINOIS RIVER AT HENRY...THE LATEST STAGE IS 15.4 FEET AT 8
PM THURSDAY. FLOOD STAGE IS 23.0 FEET. MINOR FLOODING IS FORECAST...
WITH A CREST OF 23.8 FEET WEDNESDAY EVENING...WHICH IS 0.8 FEET ABOVE
FLOOD STAGE. THE RIVER SHOULD RISE ABOVE THE FLOOD STAGE OF 23.0 FEET
TUESDAY MORNING. AT 23.0 FEET...WATER BEGINS TO AFFECT THE MARINA
IN HENRY ALONG WITH MINOR FLOODING OF LAND ADJACENT TO THE RIVER.
FOR THE ILLINOIS RIVER NEAR PEORIA...THE LATEST STAGE IS 11.6 FEET AT
8 PM THURSDAY. FLOOD STAGE IS 18.0 FEET. MINOR FLOODING IS
FORECAST...WITH A CREST OF 20.0 FEET THURSDAY EVENING...WHICH IS 2.0
FEET ABOVE FLOOD STAGE. THE RIVER SHOULD RISE ABOVE THE FLOOD STAGE
OF 18.0 FEET MONDAY EVENING. AT 18.0 FEET...SOME FLOODING BEGINS TO
BOTTOMLAND NOT PROTECTED BY LEVEES.
FLD OBSERVED FORECAST 6AM
LOCATION STG STG DAY TIME FRI SAT SUN
ILLINOIS RIVER
HENRY 23 15.4 THU 8 PM 15.4 16.9 19.2
PEORIA 18 11.6 THU 8 PM 11.9 13.4 15.4
$$
FLOOD WATCH
Warning Issue Date: 920 PM CST THU DEC 24 2009
...FLOOD WATCH NOW IN EFFECT UNTIL 6 AM CST FRIDAY...
THE FLOOD WATCH IS NOW IN EFFECT FOR
* PORTIONS OF CENTRAL ILLINOIS...EAST CENTRAL ILLINOIS AND
SOUTHEAST ILLINOIS...INCLUDING THE FOLLOWING AREAS...IN
CENTRAL ILLINOIS...CASS...CHRISTIAN...DE WITT...FULTON...
KNOX...LOGAN...MACON...MARSHALL...MASON...MCLEAN...MENARD...
MORGAN...MOULTRIE...PEORIA...PIATT...SCHUYLER...SCOTT...
SHELBY...STARK...TAZEWELL AND WOODFORD. IN EAST CENTRAL
ILLINOIS...CHAMPAIGN...CLARK...COLES...CUMBERLAND...DOUGLAS...
EDGAR AND VERMILION. IN SOUTHEAST ILLINOIS...CLAY...CRAWFORD...
EFFINGHAM...JASPER...LAWRENCE AND RICHLAND.
* UNTIL 6 AM CST FRIDAY
* EXPECT PERIODS OF MODERATE TO LOCALLY HEAVY RAINFALL. RAINFALL
AMOUNTS OF 2 TO 3 INCHES WILL BE POSSIBLE...WITH SOME LOCALLY
HIGHER AMOUNTS.
* THE LATEST SOIL TEMPERATURES ACROSS CENTRAL ILLINOIS INDICATE
THE FROST DEPTH AT BETWEEN 3 TO 5 INCHES. THE COMBINATION OF
THE EXPECTED RAINFALL COUPLED WITH THE FROZEN TOPSOIL WILL
HELP TO PRODUCE SIGNIFICANT RUNOFF INTO AREA RIVERS...CREEKS
AND STREAMS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.
$$
AUTEN
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