MESOSCALE DISCUSSION 2049
   NWS STORM PREDICTION CENTER NORMAN OK
   0346 PM CDT THU AUG 19 2004
   
   AREAS AFFECTED...PORTIONS ERN ORE...EXTREME SERN WA...SWRN ID...NERN
   NV...EXTREME NWRN UT
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 192046Z - 192315Z
   
   WIDELY SCATTERED TSTMS WILL CONTINUE TO DEVELOP -- PRIMARILY OVER
   HIGHER TERRAIN -- AND MOVE GENERALLY SEWD WITH POTENTIAL FOR
   OCCASIONAL STRONG-SEVERE GUSTS AND HAIL.  WW NOT ANTICIPATED ATTM
   BECAUSE OF MARGINAL AND LOOSELY ORGANIZED CHARACTER OF SEVERE
   THREAT.
   
   MOISTURE CHANNEL IMAGERY INDICATES SHORTWAVE TROUGH WITH TWO
   MID/UPPER LEVEL VORTICITY MAXIMA -- ONE OVER NWRN ORE AND THE OTHER
   OVER NWRN MT.  THESE FEATURES WILL MOVE SEWD ACROSS NRN PART OF
   DISCUSSION AREA THROUGH REMAINDER AFTERNOON AND...IN COMBINATION
   WITH INSOLATION...CONTRIBUTE TO FAVORABLE DESTABILIZATION.  MODIFIED
   12Z RAOBS AND RUC SOUNDINGS INDICATE STEEP LOW-MIDLEVEL LAPSE RATES
   8-9 DEG C/KM ABOVE WELL-MIXED...INVERTED-V THERMODYNAMIC PROFILE IN
   BOUNDARY LAYER.  MAX INSTABILITY SHOULD REMAIN WITHIN ABOUT 50-60 NM
   EITHER SIDE OF LINE FROM ALW...BKE...50 SW BOI...ENV.  SFC DEW
   POINTS COMMONLY RANGE FROM MID 40S TO UPPER 50S F...WITH MLCAPE
   REACHING 1000-1500 J/KG NEAR INSTABILITY AXIS. VERTICAL WIND SHEAR
   WILL REMAIN LIMITED GIVEN RELATIVELY WEAK LOW-MIDLEVEL WIND FIELDS
   OF BELOW 20 KT...HOWEVER BOUNDARY/OROGRAPHIC ENHANCEMENTS TO
   NEAR-SFC KINEMATIC FIELDS MAY AUGMENT BOUNDARY LAYER SHEAR PROFILES
   AND CONTRIBUTE TO CONVECTIVE INTENSITY LOCALLY.
   
   ..EDWARDS.. 08/19/2004
   
   
   ATTN...WFO...SLC...PIH...MSO...BOI...LKN...OTX...PDT...MFR...
   
   40681463 41181607 41921753 42271963 43431841 44512039
   45411858 45591820 45891792 46291756 46351714 46141663
   45541633 45091626 44201667 43361687 42751593 42161440
   41951354 41661338 41261343 40911380 40701429