HYDROLOGIC OUTLOOK
Warning Issue Date: 1014 AM CST THU DEC 24 2009
THE SANGAMON 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 SANGAMON RIVER AT MONTICELLO...THE LATEST STAGE IS 10.8 FEET
AT 10 AM THURSDAY. FLOOD STAGE IS 13 FEET. MINOR FLOODING IS
FORECAST...WITH A CREST OF 15 FEET SATURDAY EVENING...WHICH IS 2
FEET ABOVE FLOOD STAGE. THE RIVER SHOULD RISE ABOVE THE FLOOD STAGE
OF 13 FEET AROUND 5 AM FRIDAY. THE RIVER SHOULD FALL BELOW
FLOOD STAGE WEDNESDAY AFTERNOON. AT 13 FEET...FLOODING OF
AGRICULTURAL AREAS BEGINS.
FOR THE SANGAMON RIVER AT PETERSBURG...NO OBSERVED STAGE IS
AVAILABLE. FLOOD STAGE IS 23 FEET. THE RIVER IS FORECAST TO CREST AT
23.8 FEET WEDNESDAY MORNING. THE RIVER SHOULD RISE ABOVE THE FLOOD
STAGE OF 23 FEET EARLY MONDAY MORNING. AT 23 FEET...EXTENSIVE
AGRICULTURAL AND LOWLAND FLOODING OCCURS.
FOR THE SANGAMON RIVER NEAR OAKFORD...THE LATEST STAGE IS 464 FEET
AT 10 AM THURSDAY. FLOOD STAGE IS 471 FEET. MINOR FLOODING IS
FORECAST...WITH A CREST OF 472.3 FEET MONDAY MORNING...WHICH IS 1.3
FEET ABOVE FLOOD STAGE. THE RIVER SHOULD RISE ABOVE THE FLOOD STAGE
OF 471 FEET SATURDAY MORNING. AT 472.9 FEET...FLOODING BEGINS TO
SOME RESIDENCES IN CHANDLERVILLE.
FOR THE SANGAMON RIVER NEAR CHANDLERVILLE...THE LATEST STAGE IS 450.7
FEET AT 10 AM THURSDAY. FLOOD STAGE IS 456.6 FEET. MINOR FLOODING IS
FORECAST...WITH A CREST OF 458.8 FEET SUNDAY MORNING...WHICH IS 2.2
FEET ABOVE FLOOD STAGE. THE RIVER SHOULD RISE ABOVE THE FLOOD STAGE
OF 456.6 FEET FRIDAY AFTERNOON.
FLD OBSERVED FORECAST 6 AM
LOCATION STG STG DAY TIME FRI SAT SUN
SANGAMON RIVER
MONTICELLO 13 10.8 THU 10 AM 13.2 14.8 15.0
PETERSBURG 23 MSG 14.2 18.2 21.2
OAKFORD 471 464.0 THU 10 AM 467.6 471.0 472.0
CHANDLERVILLE 457 450.7 THU 10 AM 455.2 458.2 458.8
$$
FLOOD WATCH
Warning Issue Date: 356 AM CST THU DEC 24 2009
...FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING...
THE FLOOD WATCH CONTINUES FOR
* PORTIONS OF CENTRAL ILLINOIS...EAST CENTRAL ILLINOIS AND
SOUTHEAST ILLINOIS...INCLUDING THE FOLLOWING AREAS...IN
CENTRAL ILLINOIS...CASS...CHRISTIAN...DE WITT...FULTON...
KNOX...LOGAN...MACON...MARSHALL...MASON...MCLEAN...MENARD...
MORGAN...MOULTRIE...PEORIA...PIATT...SANGAMON...SCHUYLER...
SCOTT...SHELBY...STARK...TAZEWELL AND WOODFORD. IN EAST
CENTRAL ILLINOIS...CHAMPAIGN...CLARK...COLES...CUMBERLAND...
DOUGLAS...EDGAR AND VERMILION. IN SOUTHEAST ILLINOIS...CLAY...
CRAWFORD...EFFINGHAM...JASPER...LAWRENCE AND RICHLAND.
* THROUGH THIS EVENING
* EXPECT PERIODS OF MODERATE TO LOCALLY HEAVY RAINFALL WITH
ISOLATED THUNDERSTORMS. RAINFALL AMOUNTS OF 2 TO 3 INCHES WILL
BE POSSIBLE...WITH SOME LOCALLY HIGHER AMOUNTS.
* THE LATEST SOIL TEMPERATURES ACROSS CENTRAL ILLINOIS INDICATE
THE FROST DEPTH AT BETWEEN 3 TO 5 INCHES. THE COMBINATION OF
THE EXPECTED RAINFALL COUPLED WITH THE FROZEN TOPSOIL WILL
HELP TO PRODUCE SIGNIFICANT RUNOFF INTO AREA RIVERS...CREEKS
AND STREAMS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.
$$
SHIMON
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