HYDROLOGIC OUTLOOK
Warning Issue Date: 422 AM CST FRI DEC 25 2009
RAINFALL AND MELTING SNOW MAY CAUSE PONDING IN LOW LYING AND
URBAN AREAS TODAY AS WELL AS RISES ALONG AREA CREEKS AND
RIVERS...
A SIGNIFICANT WINTER STORM HAS BROUGHT WARMER AIR...ALONG WITH
RAIN ACROSS PARTS OF NORTHEAST IOWA...SOUTHWEST WISCONSIN AND
SOUTHEAST MINNESOTA. AS THE STORM SYSTEM MOVES NORTHWARD TOWARD THE
UPPER MISSISSIPPI RIVER VALLEY REGION TODAY...RAIN WILL CONTINUE
ACROSS THE AREA THROUGH THIS MORNING...EVENTUALLY TRANSITIONING TO
SNOW THIS AFTERNOON. RAINFALL THROUGH THIS MORNING WILL BE IN THE
QUARTER TO HALF INCH RANGE. THIS RAINFALL COMBINED WITH WHAT FELL
FROM THURSDAY THROUGH THURSDAY NIGHT WILL CONTINUE TO PRODUCE SNOW
MELT AND SOME RUNOFF.
THE COMBINATION OF THE RAINFALL ALONG WITH MELTING OF THE WIDESPREAD
SNOW PACK IS EXPECTED TO INCREASE RUNOFF AMOUNTS...WHICH WILL LIKELY
LEAD TO PONDING IN LOW LYING AND URBAN AREAS AS WELL AS WITHIN BANK
RISES ALONG AREA CREEKS AND RIVERS...WITH THE POSSIBILITY FOR SOME
LOCALIZED FLOODING. ALSO...WITH THE AMOUNT OF WATER ENTERING THE
RIVER SYSTEMS...THE POTENTIAL REMAINS FOR ICE JAMS...WHICH COULD
LEAD TO SOME LOCALIZED FLOODING.
THOSE WITH RIVER INTERESTS OR WHO LIVE IN LOW LYING AREAS SHOULD
REMAIN ALERT FOR POSSIBLE WATER ISSUES OVER THE NEXT SEVERAL DAYS.
$$
DAS
WINTER WEATHER ADVISORY
Warning Issue Date: 1035 AM CST FRI DEC 25 2009
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS
EVENING...
A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS
EVENING.
* DRIZZLE...MIXED WITH LIGHT SNOW AT TIMES...CAN BE EXPECTED THIS
AFTERNOON. THE PRECIPITATION SHOULD CHANGE OVER TO ALL SNOW THIS
EVENING.
* ADDITIONAL SNOW ACCUMULATIONS WILL BE MINIMAL THIS
AFTERNOON...GENERALLY A TRACE TO A FEW TENTHS OF AN INCH.
* TRAVEL CONDITIONS COULD BE HAZARDOUS THIS AFTERNOON...MOSTLY ON
UNTREATED AND SECONDARY ROADS. MOST MAIN THOROUGHFARES ARE WET.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.
$$
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