FXUS65 KPIH 080312
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
815 PM MST MON DEC 7 2009

.SHORT TERM...TONIGHT THROUGH THURSDAY. A QUICK UPDATE THIS EVENING 
TO INCREASE THE CHANCE OF PRECIPITATION FROM THE SNAKE RIVER PLAIN 
THROUGH THE SE HIGHLANDS. TROUGH AXIS AND CLEARING NOTED FROM 
LEADORE TO SUN VALLEY TO MOUNTAIN HOME WORKING SLOWLY EAST. SEE 
PREVIOUS DISCUSSION BELOW. HUSTON

DEEP UPPER TROF DOMINATING THE WRN US TODAY WILL CONTINUE TO ROTATE 
TO THE SE AND OUT OF THE AREA TONIGHT. THE BULK OF THE PRECIP WILL 
REMAIN S OF THE FCST AREA...WITH SCT SNOW SHOWERS LINGERING IN THE 
SRN HIGHLANDS TONIGHT. ON TUE...A MINOR TROF ROTATES THRU THE PAC NW 
AND WILL SET OFF A FEW SNOW SHOWERS IN THE EASTERN HIGHLANDS. THE NW 
JET STRENGTHENS OVER ID ON WED...AND THIS WILL INCREASE THE CHANCES 
FOR SNOW SHOWERS ACROSS THE AREA. BEST CHANCES WILL BE IN THE 
EASTERN HIGHLANDS WHERE THE UPSLOPE ENHANCMENT IS THE STRONGEST.  
LACK OF SIGNIFICANT MSTR WILL KEEP THE SNOW ON THE LIGHT SIDE. AS 
THE JET BEGINS TO GRADUALLY LIFT TO THE NE...PRECIP WILL COME TO AN 
END BY THU MORNING...EXCEPT FOR A FEW LINGERING SNOW SHOWERS IN THE 
NE CORNER OF THE FCST AREA.

TEMPS WILL REMAIN COLD THRU WED...WITH SOME MODERATION BY THU AS THE 
MAJOR UPPER TROF MOVES OFF TO THE EAST. HEDGES

LONG TERM...FRIDAY THROUGH MONDAY. 
OVERALL PATTERN APPEARS TO BE CHANGING FROM A NORTHWEST FLOW ALOFT 
TO A MORE ZONAL PATTERN WITH PACIFIC MOISTURE ENTRAINED INTO IDAHO.  
GFS AND EUROPEAN SIMILAR IN DEPICTING THIS CHANGE.  BOTH BRING 
PRECIPITATION INTO THE REGION SATURDAY.  THE EUROPEAN DELAYS UNTIL 
SATURDAY NIGHT BUT GRIDS ELEVATE PRECIPITATION CHANCES CONSIDERABLY 
BY SATURDAY.  SHOULD BE WARMER WITH THIS PATTERN BUT SNOW LEVELS 
SHOULD STILL BE NEAR VALLEY FLOORS BUT DID INCLUDE A MIX IN SNAKE 
PLAIN DURING DAY SUNDAY AND MONDAY. GK
&&

.AVIATION...SOUTHWEST FLOW ALOFT AHEAD OF UPPER TROF STILL ALLOWING 
LIGHT SNOW SHOWERS AND LOW CEILINGS INTO THE REGION.  EXPECT 
GENERALLY MVFR TO IFR CEILINGS WITH OCCASIONAL SNOW SHOWERS AT 
BYI...PIH AND IDA OVERNIGHT TONIGHT THROUGH TUESDAY MORNING WITH 
MAINLY VFR CONDITIONS AT SUN. GK
&&

.PIH WATCHES/WARNINGS/ADVISORIES...NONE.
&&

$$