MESOSCALE DISCUSSION 0057
   NWS STORM PREDICTION CENTER NORMAN OK
   0724 PM CST FRI JAN 30 2004
   
   AREAS AFFECTED...WRN/CNTRL ND
   
   CONCERNING...HEAVY SNOW 
   
   VALID 310124Z - 310630Z
   
   HEAVY SNOW WILL DEVELOP EWD INTO WRN/CNTRL ND THIS EVENING/
   OVERNIGHT. AFTER 03Z...SNOW RATES ARE EXPECTED TO REACH AND/OR
   EXCEED 1 IN/HR THROUGH 09Z.
   
   UPPER DIVERGENCE REGION AHEAD OF NRN ROCKIES UPPER TROUGH WILL
   SPREAD EWD ACROSS WRN/CNTRL ND THIS EVENING/OVERNIGHT. THIS COUPLED
   WITH MODERATE WARM AIR ADVECTION AND ISENTROPIC LIFT WILL CONTRIBUTE
   TO STRONG NET ASCENT WITH EFFECTIVE SATURATION OF INITIALLY DRY LOW
   LEVELS. THIS SCENARIO WILL CONTRIBUTE TO STEEP MID LEVEL LAPSE RATES
   ATOP SHALLOW COLD AIRMASS. PROXIMITY OF STRONG LOW TO MID LEVEL
   BAROCLINIC ZONE/FRONTOGENETICAL FORCING FURTHER SUGGESTS HEAVY SNOW
   WILL MATERIALIZE THIS EVENING/OVERNIGHT. HIGH SNOW-TO-LIQUID RATIOS
   /25:1  OR GREATER/ ARE EXPECTED OWING TO COLD NATURE OF ARCTIC
   AIRMASS.
   
   ..GUYER.. 01/31/2004
   
   
   ATTN...WFO...BIS...GGW...
   
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