MESOSCALE DISCUSSION 2313
   NWS STORM PREDICTION CENTER NORMAN OK
   0627 PM CST THU DEC 28 2006
   
   AREAS AFFECTED...ERN SLOPES OF THE FRONT RANGE IN CNTRL CO/SERN WY
   
   CONCERNING...HEAVY SNOW 
   
   VALID 290027Z - 290430Z
   
   A BAND OF HEAVY SNOW ALONG THE ERN SLOPES OF THE CO FRONT
   RANGE...FROM THE I-25 CORRIDOR WWD...WILL SPREAD NWD THROUGH THE
   EVENING HOURS INTO SERN WY. SNOWFALL RATES WILL CONTINUE TO
   OCCASIONALLY REACH 2 IN/HR AT TIMES...WITH LOCAL 3 IN/HR RATES IN
   THE FOOTHILLS.
   
   REGIONAL RADAR MOSAICS AND CURRENT SURFACE OBSERVATIONS CONFIRM A
   N/S BAND OF HEAVY SNOW HAS DEVELOPED THIS AFTERNOON ALONG THE ERN
   SLOPES OF THE FRONT RANGE. 00Z AMA/MAF OBSERVED SOUNDINGS AND ACARS
   DATA DEPICT A 100+ KT JET STREAK NOSING NWD ACROSS THE TX
   PANHANDLE...CONTRIBUTING TO UPPER-LEVEL DIVERGENCE/DIFFLUENCE IN ITS
   LEFT EXIT REGION. THIS JET WILL SPREAD NWD THROUGH THE
   EVENING...ENHANCING ASCENT INTO SERN WY. IN ADDITION...REGIONAL
   PROFILERS ACROSS THE I-25 CORRIDOR HAVE SHOWN INCREASINGLY LARGE
   VEERED LOW/MID-LEVEL HODOGRAPHS THROUGH THE AFTERNOON. ELY 1-3 KM
   AGL WINDS OF 25 TO 40 KTS WILL CONTINUE TO PROMOTE STRONG UPSLOPE
   FLOW...SUPPORTING THE EXPANSION OF HEAVY SNOW NWD. 18Z NAM/21Z RUC
   MODEL GUIDANCE WEAKEN THESE WINDS GRADUALLY FROM S TO N AFTER 03Z.
   CONSEQUENTLY...HEAVY SNOW WILL DIMINISH S OF THE PALMER DIVIDE BY
   06Z.
   
   ..GRAMS.. 12/29/2006
   
   
   ...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...PUB...BOU...CYS...
   
   41800454 41170437 40310453 39260424 38620487 37850499
   38160540 38970564 40110567 41600549 42020506