FXUS65 KBOI 291029
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
329 AM MST SUN NOV 29 2009

.SHORT TERM...TODAY THROUGH MONDAY...LARGE DOME OF SURFACE HIGH
PRESSURE WITH 1032 CENTER OVER EASTERN OREGON AT 2 AM WILL EXPAND
OVER IDAHO TODAY. PATCH OF STRATUS AND FREEZING FOG IN SOUTH
CENTRAL IDAHO LOOKS TO LAST THROUGH 18Z. WEST UPSLOPE WINDS IN
THE MAGIC VALLEY ARE EXPECTED TO DEVELOP LATE THIS AFTERNOON TO
ERODE AND DISSIPATE IT. CURRENT RH NOT AS MOIST DUE TO VERY DRY
AIR MUCH OF THE AREA SATURDAY AND GUSTY WINDS FRIDAY/SAT DRYING
OUT AREA FROM RECENT PRECIP. SO HAVE CUT BACK FOG COVERAGE. MET
TEMPERATURES ON TRACK WITH MAV/MEX PROBABLY TOO COOL EXCEPT
CAMAS PRAIRIE AND FAR NORTHWEST MAGIC VALLEY. MONDAY THE HIGH
CENTER SHIFTS EAST FOR LIGHT DIURNAL WINDS. MET TEMPS STILL LOOK
TO BE A BETTER FIT DUE TO RECENT MAV/MEX POOR HANDLING OF WARMTH
IN SE WINDS WITH DRY INVERSION.

.LONG TERM...MONDAY NIGHT THROUGH SATURDAY...LONGWAVE RIDGE WILL 
KEEP AREA DRY WITH NEAR NORMAL TEMPS UNTIL NEXT WEEKEND. A WEAK 
FEATURE PROGGED TO MOVE DOWN THE CONTINENTAL DIVIDE ON TUESDAY WILL 
DO LITTLE MORE THAN INCREASE CLOUDS AND COOL TEMPS ACROSS THE SW ID 
MTNS. WHILE DETAILS ARE STILL HARD TO PIN DOWN...MODELS ARE HINTING 
AT RETROGRESSION OF THE LONGWAVE RIDGE AXIS TO OFF THE NW COAST FOR 
NEXT WEEKEND WHICH COULD BRING A COLDER AIRMASS TO THE REGION. STILL 
ENOUGH UNCERTAINTY IN MODEL SOLUTIONS TO YET BUY INTO THIS POTENTIAL 
...SO HAVE TRENDED TEMPS/POPS TOWARDS CLIMO FOR FRI/SAT NEXT WEEK. 

&&

.AVIATION...LOCAL IFR IN LOW STRATUS AND FOG OVER THE WESTERN MAGIC 
AND UPPER TREASURE VALLEY EXPECTED TO STAY EAST OF KBOI THIS 
MORNING. ISOLATED IFR IN FOG ACROSS BAKER COUNTY AND WEST CENTRAL 
MTN VALLEYS AS WELL. AFTER SUNRISE STRATUS ERODES IN MOST LOCATIONS 
WITH ONLY ISOLATED MVFR THIS AFTERNOON NORTH OF KJER. ELSEWHERE VFR 
UNDER CLEAR SKIES WITH LIGHT WINDS SURFACE AND ALOFT.
 
FOR MONDAY EXPECT STRATUS TO EXPAND WESTWARD AGAIN IN THE MORNING 
POSSIBLY ENCROACHING ON KBOI. ALSO ISOLATED IFR IN FOG OVER THE 
LOWER TREASURE VALLEY /KEUL-KONO/ AND VALLEYS IN SE OREGON AND THE 
WEST CENTRAL AND BOISE MTNS.

&&

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

$$

WEATHER.GOV/BOISE

SHORT TERM...VM
LONG TERM....DG
AVIATION.....DG