HYDROLOGIC OUTLOOK
Warning Issue Date: 902 PM CST TUE DEC 22 2009
RENEWED RISES ON AREA RIVERS POSSIBLE LATER THIS WEEK...
A VERY STRONG LOW WILL MOVE INTO NORTHEAST IOWA BY FRIDAY
MORNING. THIS WILL BRING A MIXTURE OF PRECIPITATION
TONIGHT...WEDNESDAY AND THURSDAY INTO NORTHERN ILLINOIS AND
NORTHWEST INDIANA. THE PRECIPITATION WILL BEGIN AS SNOW AND SLEET
OVERNIGHT AND WILL CHANGE TO FREEZING DRIZZLE. WE EXPECT FREEZING
RAIN WEDNESDAY NIGHT AND EARLY THURSDAY MORNING. THEN...RAIN WILL
FALL OVER THE AREA THURSDAY. THERE IS SNOW ON THE GROUND AND THE
ADDITIONAL 1 TO 2 INCHES OF RAIN WITH SNOWMELT WILL ADD SIGNIFICANT
RUNOFF TO AREA RIVERS. SOME LOCAL RIVERS AND CREEKS MAY RISE
THURSDAY AND FRIDAY.
SNOW DEPTHS WERE GREATEST WITHIN PORTIONS OF THE ROCK...UPPER
FOX...AND UPPER DES PLAINES RIVER BASINS WHERE DEPTHS WERE BETWEEN 4
AND 8 INCHES. WATER EQUIVALENT OF THE SNOWPACK IN THOSE AREAS WAS
AROUND 1 INCH. FURTHER SOUTH...SNOW DEPTHS WERE BETWEEN 2 AND 4
INCHES WITH WATER EQUIVALENTS GENERALLY BELOW ONE HALF INCH.
REPORTED FROST DEPTHS WERE BETWEEN 2 AND 4 INCHES. ALTHOUGH RIVERS
WERE CURRENTLY BELOW FLOOD STAGE...FLOWS WERE SLIGHTLY ABOVE
NORMAL.
A COMBINATION OF HEAVY RAIN AND SNOWMELT OVER FROZEN GROUND WOULD
RESULT IN RISES ON AREA STREAMS WITH SOME RISES POSSIBLY ABOVE FLOOD
STAGE.
RESIDENTS IN LOW LYING FLOOD PRONE AREAS ALONG AREA RIVERS AND
CREEKS SHOULD CONTINUE TO MONITOR THIS DEVELOPING WEATHER SYSTEM.
$$
WINTER STORM WATCH
Warning Issue Date: 933 PM CST TUE DEC 22 2009
...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...
A WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING.
* TIMING...SLEET AND FREEZING RAIN WILL BEGIN WEDNESDAY. PLACES
NEAR LAKE MICHIGAN MAY HAVE RAIN DUE TO THE INFLUENCE OF LAKE
AIR TEMPERATURES. AWAY FROM THE LAKE...FREEZING RAIN AND SLEET
WILL DOMINATE LATE WEDNESDAY AND INTO THURSDAY MORNING.
* ACCUMULATIONS...UP TO A QUARTER INCH OF ICE.
* HAZARDS...ACCUMULATION OF ICE. SOME SLEET AND LIGHT SNOW MAY
MIX AS PRECIPITATION BEGINS ON WEDNESDAY.
* IMPACTS...GLAZING OF ROADWAYS...PARKING LOTS AND SIDEWALKS.
THIS WILL MAKE FOR HAZARDOUS TRAVEL ON UNTREATED SURFACES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.
$$
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