MESOSCALE DISCUSSION 0256
   NWS STORM PREDICTION CENTER NORMAN OK
   1107 AM CST SUN MAR 16 2003
   
   AREAS AFFECTED...SWRN/SCNTRL UT
   
   CONCERNING...HEAVY SNOW 
   
   VALID 161707Z - 162300Z
   
   EXPECT AREAS OF HEAVY SNOWFALL RATES THRU THE LATER
   AFTERNOON/EARLY EVENING HOURS. RATES MAINLY WILL BE AROUND
   1/HR...BUT SOME ISOLATED 2 IN/HR RATES COULD OCCUR. 
   
   WV/IR IMAGERY REVEAL A SHORTWAVE TROUGH AND ASSOCIATED VORTICITY
   LOBE ACROSS THE SOUTHERN DESERTS OF ERN CA INTO COLORADO RIVER
   VALLEY REGION AS STRONG 250MB JET TRANSLATES OVERHEAD. RECENT
   SURFACE ANALYSIS SHOWS WEAK SFC LOW DEVELOPMENT FROM LAKE MOJAVE
   REGION NEWD INTO THE SCNTRL UT MTNS WITH SURFACE TEMPERATURES IN
   THE DISCUSSION AREA FROM THE LOW-MID 30S. EXPECT HEAVIER SNOWFALL
   RATES TO SPREAD NNEWD THRU THE AFTERNOON HOURS AS UVM INCREASES
   DUE TO BOTH EJECTING SHORTWAVE TROUGH ENERGY AND FAVORABLE LFQ OF
   250 MB JET STREAK OVER THE REGION. PREFER A BLEND OF 15Z RUC/12Z
   ETA WITH THE HEAVIEST RATES SPREADING NNEWD INTO SWRN UT BY
   18-21Z...THEN INTO SCNTRL UT BY LATE AFTERNOON/EARLY EVENING.  
   
   ..NADEN.. 03/16/2003
   
   
   ATTN...WFO...SLC...VEF...
   
   39541097 39341118 38961125 38461145 38141134 37731179
   37301230 37231271 37401372 37521405 37951400 37871340
   37991307 38291295 38821278 39241232 39411195 39771171
   39711127