MESOSCALE DISCUSSION 2184
   NWS STORM PREDICTION CENTER NORMAN OK
   0540 AM CST THU DEC 06 2007
   
   AREAS AFFECTED...ERN NEB/FAR SWRN IA/NERN-EAST CENTRAL KS AND
   ADJACENT PART OF MO
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 061140Z - 061445Z
   
   CORRECTED TO CLARIFY NWD EXTENT OF FREEZING RAIN THREAT
   
   SNOWFALL RATES UP TO 1 IN/HR ARE EXPECTED TO DEVELOP ACROSS ERN NEB
   FROM HOLT TO YORK/FILLMORE COUNTIES BETWEEN 12-15Z AND INTO FAR ERN
   NEB/FAR SWRN IA INCLUDING THE OMAHA METRO AREA BETWEEN 15-18Z. 
   FARTHER S...THERMODYNAMIC PROFILES PER FORECAST SOUNDINGS INDICATE A
   WARM LAYER IN THE LOW LEVELS WILL SUPPORT A MIXTURE OF SLEET/
   FREEZING RAIN ACROSS MAINLY EAST CENTRAL KS AND ADJACENT PARTS OF
   WEST CENTRAL MO...GENERALLY S OF THE I-70 CORRIDOR...BY 18Z.
   
   AT 10Z...REGIONAL RADARS INDICATED AN AREA OF PRECIPITATION MAINLY
   IN THE FORM OF LIGHT SNOW ACROSS CENTRAL NEB AND A MIXTURE OF PTYPES
   INTO NORTH CENTRAL NEB.  WINTRY PRECIPITATION IS EXPECTED TO EXPAND
   IN AREAL COVERAGE AND INCREASE IN INTENSITY ACROSS ERN NEB/NERN KS
   THIS MORNING.  THIS WILL OCCUR AS ASCENT WITHIN LEFT EXIT REGION OF
   WLY MID/UPPER LEVEL JETS ACCOMPANYING CENTRAL ROCKIES SHORT WAVE
   TROUGH DEVELOPS EWD INTO THE CENTRAL PLAINS.  THIS ASCENT WILL BE
   ENHANCED BY INCREASING WAA REGIME ALONG AXIS OF STRONG SSWLY LLJ
   EXTENDING INTO ERN NEB BY LATE MORNING.  ALTHOUGH ONGOING
   PRECIPITATION BEGAN AS A MIXTURE OF WINTER PTYPES...THE EXPECTED
   INCREASE OF UVVS WILL SUPPORT SUFFICIENT COOLING IN THE COLUMN FOR
   THE PTYPE TO BE MAINLY SNOW ACROSS ERN NEB TO NWRN MO WHERE SNOWFALL
   RATES SHOULD APPROACH 1 IN/HR BY MID-LATE MORNING.  GIVEN THE
   POTENTIAL FOR STRONG UVVS TO EXTEND SWD...FREEZING RAIN RATES S OF
   I-70 CORRIDOR MAY REACH FROM 0.05 TO 0.1 IN/HR FOR A FEW HOURS ONCE
   PRECIPITATION BEGINS AROUND 15-18Z.
   
   ..PETERS.. 12/06/2007
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...EAX...FSD...OAX...TOP...ICT...GID...LBF...
   
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