HAZARDOUS WEATHER OUTLOOK
Issue Date: 340 PM CST TUE DEC 22 2009
Expiration: 430 AM CST WED DEC 23 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL
WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN.
.DAY ONE...TONIGHT
LIGHT SNOW WILL TAPER OFF BY EARLY THIS EVENING. TOTAL SNOW
ACCUMULATIONS WILL RANGE FROM UP TO AN INCH FROM MONTELLO TO
SHEBOYGAN...TO 2 TO 4 INCHES FROM DARLINGTON...TO JANESVILLE...TO
TWIN LAKES. ISOLATED 5 INCH AMOUNTS ARE POSSIBLE NEAR THE ILLINOIS
BORDER.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
A COMPLEX STORM SYSTEM WILL FORM OVER THE SOUTHERN PLAINS BY
WEDNESDAY...AND TRACK SLOWLY NORTH INTO THE GREAT LAKES REGION ON
CHRISTMAS DAY.
AT THIS TIME...THE EXPECTED TRACK OF THE STORM SYSTEM WILL TAKE IT
FROM EAST CENTRAL IOWA CHRISTMAS DAY...TO WEST CENTRAL WISCONSIN
FRIDAY NIGHT...AND SLOWLY NORTHEAST AS IT WEAKENS ON SATURDAY. THIS
IS A WARMER TRACK FOR SOUTHERN WISCONSIN...AND IS ONE THAT WILL
RESULT IN A WIDE VARIETY OF WINTRY PRECIPITATION TYPES.
THE MOST HAZARDOUS PERIOD LOOKS TO BE LATE WEDNESDAY NIGHT THROUGH
THURSDAY...WHEN A SURGE OF WARM AIR JUST OFF THE SURFACE AHEAD OF
THIS STORM SYSTEM WILL CREATE THE BEST CHANCE FOR A PERIOD OF
FREEZING RAIN...SNOW AND SLEET. THERE IS A POTENTIAL THAT ICE
ACCUMULATIONS COULD REACH ONE QUARTER TO ONE HALF INCH...CAUSING A
MORE SIGNIFICANT IMPACT.
ADDITIONALLY...THERE IS THE THREAT FOR ENOUGH RAIN TO FALL ON TOP OF
THE CURRENT SNOW PACK TO RESULT IN MINOR FLOODING OF AREA
CREEKS...RIVERS...AND STREAMS. RUNOFF COULD ALSO CAUSE PONDING OF
WATER ON AREA ROADWAYS.
ANY ACCUMULATING SNOW SHOULD OCCUR AT THE BEGINNING OF THIS SYSTEM
WEDNESDAY NIGHT INTO THURSDAY MORNING...AND THEN AGAIN THURSDAY NIGHT
AND FRIDAY AS COLDER AIR POURS BACK INTO THE REGION.
AS A RESULT...A WINTER STORM WATCH HAS BEEN ISSUED FOR ALL OF
SOUTHERN WISCONSIN...FROM WEDNESDAY NIGHT THROUGH THURSDAY. SEE THE
WINTER WEATHER MESSAGE PRODUCT FOR MORE DETAILED INFORMATION.
HOLIDAY TRAVEL IS LIKELY TO BE IMPACTED. GIVEN THE LARGE COMPLEXITY
OF THIS STORM SYSTEM...ADJUSTMENTS TO THE FORECAST ARE STILL LIKELY.
STAY ABREAST OF THE LATEST FORECAST CONCERNING THIS EXPECTED WINTER
STORM FOR THE UPCOMING HOLIDAY PERIOD.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED...BUT SNOWFALL REPORTS FROM
THE SNOWFALL EARLIER TODAY WILL BE APPRECIATED.
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