FXUS65 KBOI 301022
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
322 AM MST MON NOV 30 2009

.SHORT TERM...TODAY THROUGH TUESDAY...WARMER TODAY AS COLD HIGH
CENTER SHRINKS AS IT SHIFTS SLOWLY SOUTHEAST OF THE AREA.
DOWNSLOPE SURFACE WINDS IN THE MAGIC VALLEY AND IDAHO TREASURE
VALLEY ARE KEEPING HUMIDITIES IN THE 75-85 PCT RANGE. RIM OF THE
VALLEY OR FOOTHILLLS FROM AROUND JEROME TO NE BOISE WILL STILL BE
SUSEPTABLE TO STRATUS AND PATCHY FOG EARLY TODAY. EARLY DAY/S
GREATER FOG COVERAGE/CHANCES STILL ON TRACK FOR THE LONG VALLEY
THIS MORNING AND BAKER CITY EARLY THIS MORNING. MOISTURE WITH THE
FRONT OVER FAR SW CANADA IS NARROWING AND SO FAR ONLY TRACE
AMOUNTS HAVE BEEN NOTED /SUCH AS AT CYZT/. THE UPPER TROUGH OFF
THE QUEEN CHARLOTTES WILL PUSH THE FRONT SE MAINLY INTO MT...AND
CAUSE A MARITIME- ORIGIN BUBBLE SURFACE HIGH CURRENTLY 40-50N AND
130-140W TO BUILD INLAND TONIGHT. TEMPERATURE-WISE THIS WILL BE A
COMPARITIVELY MILD HIGH PRESSURE WITH PERSISTENT DEW POINTS.
FOG/STRATUS MONDAY NIGHT LOOKS TO BE LIMITED TO SHELTED
BACKCOUNTRY VALLEYS/BASINS. ON TUESDAY NORTH FLOW ALOFT ACROSS
WESTERN CANADA DRIVES A COLDER DRIER AND STRONGER HIGH TOWARDS SE
OREGON AND SW IDAHO FOR TUESDAY. THIS HIGH CENTER CROSSES THE
CANADIAN ROCKIES TONIGHT AND NUDGES INTO THE AREA TUESDAY FOR 4-8
DEGREES OF COOLING. THIS SECOND ONE ALSO LOOKS TO PRODUCE MORE
WINDS...10-20 MPH LOCALLY GUSTING TO 30 MPH TUESDAY AFTERNOON AS
COLD AIR ADVECTION AIDS MIXING OF STRONGER WINDS ALOFT.

.LONG TERM...TUESDAY NIGHT THROUGH SUNDAY...LONGWAVE RIDGE OVER THE 
PAC NW WILL KEEP CONDITIONS DRY WITH NEAR NORMAL TEMPS THROUGH 
FRIDAY. MORE INTERESTING PART OF THE FORECAST IS PATTERN CHANGE 
SHAPING UP FOR THE WEEKEND WHICH WILL LIKELY BRING WELL BELOW NORMAL 
TEMPS. WESTWARD SHIFT AND AMPLIFICATION IN LONGWAVE RIDGE AXIS STILL 
ADVERTISED FOR FRI/SAT. THIS IS INCREASING CONFIDENCE OF A MODIFIED 
ARCTIC AIRMASS OUTBREAK ACROSS THE INTERMOUNTAIN WEST FOR 
SAT/SUN/MON WHICH WOULD CERTAINLY BRING THE COLDEST TEMPS OF THE 
SEASON. GENERAL MODEL CONSENSUS SHOWS SOUTHERN PUSH OF ARCTIC 
AIRMASS IN THE VICINITY OF ID/NV BORDER THOUGH STILL TOO EARLY TO 
PIN DOWN THAT DETAIL. UNCERTAINTY INCREASES FOR SUN/MON WITH 
POTENTIAL INTRUSION OF MILD PACIFIC AIRMASS UNDERCUTTING THE RIDGE. 
THAT SAID...WILL LIKELY SEE TEMPS AT LEAST 10F BELOW NORMAL FOR THE 
WEEKEND WITH A CHANCE OF SNOW SHOWERS IN THE MTNS. 

&&

.AVIATION...ISOLATED IFR IN FOG ACROSS VALLEYS OF WEST CENTRAL AND 
BOISE MTNS THIS MORNING WILL BURN OFF BY NOON. OTHERWISE VFR UNDER 
MOSTLY CLEAR SKIES. COLD FRONT WITH BAND OF MID-LEVEL CEILINGS WILL 
MOVE THROUGH SE OREGON AND SW IDAHO MONDAY NIGHT. ISOLATED MVFR 
CONDITIONS IN LIGHT SNOW SHOWERS NORTH OF KBKE-KMYL LINE EARLY 
TUESDAY MORNING. LIGHT SURFACE WINDS TODAY WITH WINDS ALOFT 
INCREASING TO 30 KTS OUT OF THE WEST BY THIS EVENING.

&&

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

$$

WEATHER.GOV/BOISE

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