FXUS65 KBOI 261027
AFDBOI
AREA FORECAST DISCUSSION...CORRECTION
NATIONAL WEATHER SERVICE BOISE ID
328 AM MST THU NOV 26 2009

.SHORT TERM...TODAY THROUGH FRIDAY...THE UPPER LEVEL RIDGE AXIS WILL 
DRIFT EAST OF THE ROCKIES TODAY WHILE THE SURFACE HIGH REMAINS 
ANCHORED OVER SOUTHEAST IDAHO. STABILITY WILL STEADILY DECREASE AS 
THE SURFACE PRESSURE GRADIENT FOR DOWN VALLEY WINDS INCREASES...
RESULTING IN AFTERNOON HIGHS SLIGHTLY ABOVE WEDNESDAY/S. HIGH CLOUDS 
WILL INCREASE FROM THE WEST TODAY OVER OUR OREGON ZONES WHILE SKIES 
STAY SUNNY BUT HAZY ON THE IDAHO SIDE. THE NEXT PACIFIC WEATHER 
SYSTEM WILL MOVE INLAND TONIGHT SPREADING SCATTERED RAIN AND SNOW 
SHOWERS INTO BAKER AND HARNEY COUNTIES AFTER MIDNIGHT. MODELS SHOW 
ONLY MINOR TIMING DIFFERENCES IN THE SHORT TERM. THE UPPER LEVEL 
TROUGH ASSOCIATED WITH THIS SYSTEM WILL SPLIT OVER THE INTERMOUNTAIN 
REGION ON FRIDAY WITH MOST OF THE ENERGY STAYING BOTH NORTH AND 
WELL SOUTH OF OUR AREA. SHOWERS WILL CONTINUE TO SPREAD EAST ON 
FRIDAY WITH MOST PRECIPITATION FALLING OVER THE MOUNTAINS NORTH OF 
THE SNAKE RIVER VALLEY. LIGHT TO MODERATE AMOUNTS OF SNOW WILL 
ACCUMULATE ABOVE 5000 FEET...BUT TOTALS ARE NOT EXPECTED TO BE 
ENOUGH TO CAUSE SIGNIFICANT IMPACTS. 

.LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...BREEZY EAST OF BOISE 
FRIDAY EVENING AS AN UPPER TROUGH EXITS THE REGION. GFS IS FASTER 
EXITING THIS TROUGH WHILE THE FAVORED SLOWER EC KEEPS COLD NORTHERLY 
FLOW OVER THE REGION. THIS ALLOWS FOR BELOW NORMAL TEMPERATURES AND 
MAINLY DRY WX THIS WEEKEND. SO HAVE NUDGED ALL BUT THE FAR NE TO DRY 
WX AS THE STORM TRACK SHIFTS EAST. NO CHANGES MID/LATE PERIODS AS 
LARGE DIFFERENCES IN THE MODELS CONTINUE. CURRENT FORECAST IS 
SUPPORTED BY THE WIDELY FAVORED SLOWER EC SOLUTION. NOW THE EC IS 
ALSO DEEPER THAN ITS PREV. RUN AND MUCH DEEPER THAN THE GFS...WITH A 
TROUGH OVER IDAHO AND THE NW TUESDAY. WILL HOLD OFF CHANGES IN DAY 
5...OR LATER. LOOKING AT THE LONGEST RANGES THE NCEP FORECASTS FOR 
THE FIRST WEEK OF DECEMBER SHOW DRIER THAN NORMAL CONDITIONS...WHICH 
ARE NEARLY CENTERED OVER SE OREGON/SW IDAHO. 

&&

.AVIATION...AREAS OF DENSE FREEZING FOG IN THE LONG VALLEY UNTIL 
16Z...BECOMING VFR TOWARDS 20Z. PATCHY HAZE BRIEFLY 5SM UNTIL 14Z. 
APPROACHING PACIFIC SHORT WAVE SPREADING SCT-BKN HIGH CLOUDS FROM NE 
OREGON THIS MORNING THROUGH CENTRAL IDAHO THIS AFTERNOON. CIGS 
DROPPING TO OBSCURE MOUNTAIN TOPS IN THE BLUES AND CENTRAL IDAHO 
09-12Z FRIDAY WITH SEVERAL HOURS OF LIGHT IFR SNOW IN THE MOUNTAINS. 
AND EXITING OREGON/IDAHO 00Z/09Z RESPECTIVELY.   SFC WINDS LIGHT. 
LIGHT WINDS ALOFT UNTIL 18Z THEN AVERAGING 240/25KTS THROUGH FRIDAY.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
OR...NONE.
&&

$$

WEATHER.GOV/BOISE

SHORT TERM...JT
LONG TERM....VM
AVIATION.....VM