HYDROLOGIC OUTLOOK
Warning Issue Date: 601 AM CST TUE DEC 22 2009
SIGNIFICANT RAINFALL AND SNOW MELT POSSIBLE WEDNESDAY AND
THURSDAY...
A LARGE SWATH OF MOISTURE IS FORECAST TO PUSH INTO THE STATE
THROUGH THURSDAY...ALONG WITH TEMPERATURES ABOVE FREEZING. LOOK
FOR RAIN TO DEVELOP...GENERALLY ALONG AND SOUTH OF INTERSTATE
80...BY WEDNESDAY MORNING AND IS FORECAST TO CONTINUE THROUGH
THURSDAY. THERE WILL BE PERIODS OF FREEZING RAIN IN SOME AREAS
ALONG THE CORRIDOR OF INTERSTATE 80 DURING THE MORNING HOURS
WEDNESDAY BEFORE SWITCHING TO ALL RAIN BY WEDNESDAY AFTERNOON.
RAINFALL AMOUNTS OF THREE-QUARTERS OF AN INCH TO AN INCH AND A
HALF ARE ANTICIPATED WITH THIS SYSTEM BY THURSDAY. IN
ADDITION...THE CURRENT SNOW PACK CONTAINS AROUND ONE INCH TO AN
INCH AND A HALF OF LIQUID EQUIVALENT...LEADING TO THE POTENTIAL
FOR SIGNIFICANT RUNOFF FROM RAINFALL AND SNOW MELT.
HIGH TEMPERATURES ARE EXPECTED TO BE IN THE MIDDLE TO UPPER 30S
ACROSS CENTRAL TO SOUTHERN...WITH TEMPERATURES ANTICIPATED TO
REMAIN STEADY OR SLOWLY RISING INTO THE LOWER 40S DURING THE
OVERNIGHT HOURS WEDNESDAY INTO THURSDAY. AS A RESULT...A PROLONG
PERIOD OF TEMPERATURES ABOVE FREEZING WILL RESULT IN A SIGNIFICANT
AMOUNT OF SNOW MELT DURING THE TIME FRAME.
AREA STREAMS AND RIVERS ACROSS THE SOUTHERN HALF OF IOWA WILL
LIKELY EXPERIENCE LARGE RISES DUE TO THE COMBINATION OF RAINFALL
AND SNOW MELT BY THURSDAY AND RIVER FLOODING MAY BECOME
PROBLEMATIC. BASINS WHICH APPEAR MOST LIKELY TO BE AFFECTED
INCLUDE THE CHARITON...LOWER DES MOINES...SOUTH SKUNK...CEDAR
CREEK...AND THE THOMPSON RIVERS ACROSS THE SOUTHERN HALF OF
CENTRAL IOWA.
$$
PODRAZIK/COGIL
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