MESOSCALE DISCUSSION 0183
   NWS STORM PREDICTION CENTER NORMAN OK
   0645 PM CST MON MAR 03 2003
   
   AREAS AFFECTED...SRN SD AND NRN NEB
   
   CONCERNING...HEAVY SNOW 
   
   VALID 040045Z - 040545Z
   
   A NARROW AXIS OF HEAVY SNOW WILL DEVELOP ACROSS THE NWRN NEB
   PANHANDLE/BLACK HILLS REGION BETWEEN 03-06Z AND SPREAD RAPIDLY
   EWD ALONG THE SD/NEB BORDER OVERNIGHT. SNOWFALL RATES AROUND
   1"/HR ARE EXPECTED LOCALLY FOR A PERIOD OF 1-3 HOURS ACROSS THE
   DISCUSSION AREA.
   
   A STRONG E-W BAND OF UVV WILL DEVELOP ALONG THE SWRN SD/NWRN NEB
   BORDER BETWEEN 04/03-06Z AND SPREAD EWD TO FAR SERN SD AND FAR
   NERN NEB BY 04/12Z. STRONG DEFORMATION/FRONTOGENETIC FORCING WILL
   DEVELOP WITHIN CONFLUENT 700MB FLOW PATTERN AND STRONG BAROCLINIC
   ZONE ACROSS THE DISCUSSION AREA...DOWNSTREAM FROM THE POSITIVE
   TILT TROUGH ACROSS THE NRN ROCKIES. IR SATELLITE IMAGERY AT 0015Z
   INDICATES COOLING CLOUD TOPS ACROSS CENTRAL WY ASSOCIATED WITH
   THIS FORCING...WHICH WILL SPREAD INTO THE HIGH PLAINS BETWEEN
   03-06Z. ETA MODEL SOUNDINGS ALONG SD/NEB BORDER TONIGHT INDICATE
   700-500MB LAPSE RATES AROUND 7C/KM AND STRONG UVV WITHIN DENDRITE
   GROWTH ZONE /-12 TO -16C/ EXTENDING FROM 750-600MB. CONDITIONS
   APPEAR SUFFICIENT FOR A NARROW E-W BAND OF HEAVY SNOW PROPAGATING
   EWD ALONG THE NEB/SD BORDER DURING THE OVERNIGHT PERIOD. SNOW
   RATES AROUND 1"/HR LASTING LOCALLY FOR A PERIOD OF 1-3 HOURS
   APPEAR LIKELY BEFORE VERY DRY BOUNDARY LAYER AIR ADVECTS MOVES
   INTO THE REGION FROM THE NORTH.
   
   ..BANACOS.. 03/04/2003
   
   
   43560023 42860005 42090031 
   
   42070170 42270362 42670391 44170388 43880265 43360191
   43269691 42339684 42099873