000
FXUS65 KBOI 242155 CCA
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
255 PM MST TUE NOV 24 2009

.SHORT TERM...INVERSION DEVELOPING IN THE VALLEYS OF OUR CWA AS
SHORT WAVE RIDGE BUILDS IN ALOFT FROM THE WEST.  VALLEY MIN AND MAX
TEMPS WILL CHANGE ONLY SLIGHTLY NEXT TWO DAYS WHILE HIGHER SLOPES
GRADUALLY WARM.  LACK OF LOW-LEVEL MOISTURE WILL MINIMIZE FOG AND
STRATUS BUT HAZE WILL BECOME MORE NOTICEABLE THROUGH THANKSGIVING.
THE CAMAS PRAIRIE...INCLUDING FAIRFIELD...WILL CONTINUE MUCH COLDER
THAN ANYWHERE ELSE.  THAT AREA HAD SUBZERO TEMPS THIS MORNING AND
ONLY TEENS THROUGH 20Z AND WE SEE LITTLE REASON FOR CHANGE NEXT TWO
DAYS.  WRN MAGIC VALLEY MAX TEMPS SHOULD WARM SEVERAL DEGS THURSDAY
AS INVERSION SHALLOWS...BUT THE TREASURE AND MALHEUR VALLEYS SHOULD
STAY COOL/COLD.  LIGHT WINDS...NO PCPN.

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...APPROACHING SHORT WAVE
WILL MOVE THROUGH THE INTERMOUNTAIN WEST ON FRIDAY WITH VALLEY RAIN
AND MTN SNOW. QPF AMOUNTS ARE LIGHT WITH BAND OF HIGHER PW GETTING
CUT OFF AS SHORT WAVE MOVES ONSHORE. WILL SEE GUSTY POST-FRONTAL
WINDS FRIDAY NIGHT AND SATURDAY WITH NWLY FLOW ALOFT. SOME MODEL
DIFFERENCES IN HOW QUICKLY TO REBUILD THE RIDGE OVER THE WEEKEND.
STILL CHANCE OF A SECONDARY WAVE BRINGING PRECIP TO MUCH OF THE
FORECAST AREA ON SATURDAY. HIGHEST CONFIDENCE IS OVER THE WEST
CENTRAL AND BOISE MTNS WHERE DIFFERING MODEL SOLUTIONS OVERLAP.
MODELS IN DISAGREEMENT ON EXTENDED PERIOD.

&&

.AVIATION...VFR CONDITIONS TONIGHT WITH ISOLATED IFR IN LOWER
TREASURE VALLEY AND MVFR IN LOW STRATUS OVER THE WESTERN MAGIC
VALLEY AND UPPER TREASURE VALLEY. WITH SE SURFACE WIND GREATEST
CHANCE FOR NON-VFR CONDITIONS AT KBOI WOULD BE ADVECTION OF STRATUS
THAT FORMS OVER WESTERN MAGIC VALLEY. FOG/STRATUS DISSIPATES
WEDNESDAY BEFORE REFORMING IN MANY OF THE SAME LOCATIONS WEDNESDAY
NIGHT. WILL SEE VFR IN THE MTNS AFTER MORNING VALLEY FOG DISSIPATES.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...LC
LONG TERM....DG/BB
AVIATION.....DG