MESOSCALE DISCUSSION 2488
   NWS STORM PREDICTION CENTER NORMAN OK
   1044 AM CST SUN NOV 28 2004
   
   AREAS AFFECTED...NEB
   
   CONCERNING...HEAVY SNOW 
   
   VALID 281644Z - 282245Z
   
   A BAND OF HVY SNOW WITH HOURLY RATES APPROACHING 1 INCH WILL
   CONTINUE TO DEVELOP ENEWD ACROSS CNTRL/ERN NEB THROUGH THE EARLY
   AFTERNOON. FOCUS FOR MDT-HVY SNOW IS ANTICIPATED TO GRADUALLY SHIFT
   SWWD INTO FAR NWRN KS AND NERN CO TOWARDS 00Z...WITH THE HVY SNOW
   BAND LIKELY PERSISTING ACROSS CENTRAL/ERN NEB THROUGH MOST OF THE
   AFTERNOON.
   
   REGIONAL RADARS SHOW A WELL DEVELOPED NARROW BAND /10-20 MILES WIDE/
   OF MDT-HVY SNOW ALONG AN AXIS FROM SDY TO 10 N OF LBF TO HSI. A
   RELATIVELY DRY AIRMASS ACROSS THE REGION WITH DEWPTS IN THE LOWER TO
   MID 20S WILL SUPPORT HIGH SNOW/WATER EQUIVALENT RATIOS AROUND 15:1.
   THIS DRY AIR IN THE LOW LEVELS WILL ALSO ACT TO SUPPORT A
   CONTINUATION OF A VERY FOCUSED BAND OF HVY SNOW...WITH A STRONG
   GRADIENT OF VISIBILITIES/SNOWFALL RATES WITHIN A FEW MILE DISTANCE
   ON EITHER SIDE OF THE BAND. THIS BAND OF MDT-HVY SNOW MATCHES UP
   WELL WITH STRONG MID LEVEL WAA SUPPORTED BY 50 KT SWLY FLOW IN THE 3
   KM LAYER EVIDENT ON REGIONAL PROFILER DATA. STRONG UPPER LEVEL JET
   MAX CENTERED OVER NEB AND MID LEVEL WAA WILL CONTINUE TO SUPPORT
   FRONTOGENETIC FORCING ZONE IN THE 600-650 MB LAYER WHERE
   THERMODYNAMIC PROFILES SUPPORT RAPID DENDRITIC SNOW GROWTH. GIVEN
   SLOW SEWD MOTION OF UPPER SYSTEM ACROSS THE GREAT BASIN...AND EWD
   MOVEMENT OF LEAD MID LEVEL SHORTWAVE TROUGH/DRY SLOT OVER THE
   CENTRAL ROCKIES IT IS ANTICIPATED THAT THE MID LEVEL FORCING/HVY
   SNOW BAND WILL LIKELY SHIFT SLOWLY ENEWD THROUGH THE DAY. THUS AREAS
   ACROSS THE NEBRASKA PANHANDLE/WRN NEB SHOULD SEE A DIMINISHING TREND
   IN HVY SNOW IN THE 17-20Z TIME FRAME.
   
   ..CROSBIE.. 11/28/2004
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A 
   SCHEDULED BASIS...FOUR TIMES A DAY...BETWEEN 05-06 UTC...
   11-12 UTC...17-18 UTC...AND 23-00 UTC AS SIGNIFICANT SHORT
   RANGE WINTER WEATHER EVENTS UNFOLD.  THIS SCHEDULE WILL BE
   USED FROM DECEMBER 1 THROUGH FEBRUARY 28 TO ALLOW PARTNERS
   AND USERS TO BETTER ANTICIPATE THE TIMING OF SPC WINTER WEATHER
   MESOSCALE DISCUSSIONS.
   
   ATTN...WFO...OAX...GID...LBF...BOU...CYS...
   
   41270360 42180357 41969974 41389664 40219615 40319745
   40830260