MESOSCALE DISCUSSION 2107
   NWS STORM PREDICTION CENTER NORMAN OK
   0210 PM CDT WED AUG 06 2003
   
   AREAS AFFECTED...N-CENTRAL ID AND FAR WRN MT
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 061910Z - 062145Z
   
   THUNDERSTORM COVERAGE IS EXPECTED TO INCREASE ACROSS N-CENTRAL ID
   AND FAR WRN MT DURING THE NEXT FEW HOURS. POTENTIAL EXISTS FOR A FEW
   SEVERE STORMS WITH MARGINALLY SEVERE HAIL AND LOCALIZED DAMAGING
   WINDS. CONVECTIVE TRENDS WILL BE MONITORED FOR A POSSIBLE SEVERE
   THUNDERSTORM WATCH DURING NEXT 1-3 HOURS. 
   
   THUNDERSTORMS BEGINNING TO DEVELOP ACROSS VALLEY...IDAHO...AND LEMHI
   COUNTIES IN THE MTNS OF N-CENTRAL ID AT 19Z WILL SPREAD NEWD INTO
   WRN MT AND INTENSIFY DURING THE REMAINDER OF THE AFTERNOON HOURS. A
   SHORTWAVE TROUGH MOVING NEWD INTO CENTRAL ID...EMBEDDED IN 40 KT
   SWLY 500MB FLOW...SHOULD AID IN LARGE-SCALE LIFT AND THUNDERSTORM
   DEVELOPMENT OVER THE DISCUSSION AREA. DIURNAL HEATING OVER THE MTNS
   OF N-CENTRAL ID AND WRN MT HAS RESULTED IN MODERATE INSTABILITY WITH
   100MB MLCAPE VALUES OF 1000-2000 J/KG. STEEP 700-500MB LAPSE RATES
   OF 8-8.5C/KM BASED ON ETAKF SOUNDINGS THIS AFTERNOON...IN ADDITION
   TO SFC-6KM SHEAR OF 50-55 KT AND CONTINUED HEATING SHOULD RESULT IN
   A FEW SEVERE THUNDERSTORMS FROM N-CENTRAL ID INTO FAR WRN MT...WITH
   MARGINALLY SEVERE HAIL AND LOCALIZED DAMAGING DOWNDRAFT WINDS.
   
   ..BANACOS.. 08/06/2003
   
   
   ATTN...WFO...TFX...PIH...MSO...BOI...OTX...
   
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