210 
FXUS65 KBOI 220459
AFDBOI

SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION 
NATIONAL WEATHER SERVICE BOISE IDAHO
900 PM MST TUE NOV 21 2000

NE TO SW SFC HIGH PRES GRADIENT WITH DIFFLUENT SW FLOW ALOFT ALLOWING 
LOTS OF MAINLY MID/HI CLOUDS OVER CWA THIS EVENING WITH A STRAY SHOWER 
OVER THE SW HIGHLANDS.  COUPLE OF UPPER SHORT WAVE TROFS PINWHEEL 
AROUND UPPER LOW TONIGHT AND EARLY WED WITH PROBABLY ENUF MOISTURE TO 
ALLOW ISOL NIGHT AND EARLY WED SHOWERS BUT RH SHIFTS INTO NV BY LATE AM 
SO WILL ONLY UPDATE 1ST PD FOR SW HIGHLANDS.  A STRAY SHOWER COULD 
DRIFT N BUT NOT ENUF CHC TO MENTION WHOLE ZONE WISE.  LIGHT WINDS 
EXCEPT GOOD OL GUSTY MAGIC VLY TONIGHT THEN SFC HIGH PRES BUILDS N OF 
WA WED FOR NW WINDS BUT 10 KTS OR LESS...FOR WED AFTERNOON.  HIGH PRES 
SFC AND ALOFT WED NIGHT AND THANKSGIVING ID PART WITH ADVANCING SYSTEM 
OVER SE OREGON THANKSGIVING...POSSIBLY MEASUREABLE SNOW BY LATE 
AFTERNOON BNO/BKE.  00Z MESOETA AND 0Z ETA SHOW AN INCH AT BNO AND HALF 
INCH AT BKE WHILE USUALLY FASTER NGM IS SLOWER WITH A DUSTING OR SO 
EACH BNO/BKE.  12Z AVN WAS SLOWER AND 00Z AVN JUST COMING IN ON AWIPS 
BUT AS OF 30HR VALID 6Z AVN IS FASTER THAN ALL THE NEW 00Z RUNS AS IT 
BRINGS LIGHT OCEANIC PRECIP IN FASTER.  YESTERDAYS TREND OF FASTER RUNS 
MAY HOLD AGAIN TONIGHT...BUT NO ADJUSTMENTS TO LATER PDS THIS SHIFT.  
JUST MINOR UPDATE ALONG ID/NV BDR.

.BOI...NONE.
VM