Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 172144
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
244 PM MST WED DEC 17 2014

.SHORT TERM...TONIGHT THROUGH FRIDAY...A WEAK SHORT WAVE TROUGH
WILL MOVE THROUGH OVERNIGHT...SPREADING LIGHT SHOWERS MAINLY INTO
HARNEY COUNTY THIS EVENING...AND THE HIGHER TERRAIN OF THE NORTH
AFTER MIDNIGHT. A WEAK RIDGE AXIS WILL THEN QUICKLY FOLLOW THU AND
THU NIGHT. ON FRIDAY...THE REGION WILL SEE INCREASING MOISTURE AS
SW FLOW ALOFT IS REESTABLISHED IN ADVANCE OF A STRONG MOIST JET
MOVING IN FROM THE PACIFIC. ONE ROUND OF PRECIPITATION WILL MOVE
THROUGH DURING THE DAY FRIDAY...WITH THE BULK IN ERN OREGON IN THE
MORNING AND IN SW IDAHO IN THE AFTERNOON. HOWEVER...SHOWERS ARE
POSSIBLE IN ALL AREAS MOST OF THE DAY. SEVERAL INCHES OF SNOW ARE
LIKELY ABOVE 3500 TO 4000 FEET. TEMPS WILL CONTINUE TO BE ABOVE
NORMAL...WITH LIGHT WINDS AND MOSTLY CLOUDY SKIES LASTING THROUGH
THE SHORT TERM. FRIDAY MORNING RAIN MAY MIX WITH SNOW IN THE
TREASURE VALLEY...BUT TEMPS ARE EXPECTED TO BE JUST ABOVE FREEZING
SO TRAVEL PROBLEMS SHOULD BE MINIMAL.

.LONG TERM...FRIDAY NIGHT THROUGH MONDAY...MODELS CONTINUE IN
GOOD AGREEMENT THROUGH MONDAY. MILD ZONAL FLOW WILL BRING A WEAK
DISTURBANCE ACROSS OUR CWA FRIDAY NIGHT WITH MAINLY LIGHT
PRECIPITATION AND SNOW LEVELS AROUND 4000 FEET. SATURDAY THROUGH
SUNDAY THE UPPER LEVEL FLOW WILL BECOME MORE NORTHWESTERLY COMING
AROUND AN UPPER LEVEL RIDGE BUILDING OFF THE CALIFORNIA COAST.
THIS WILL PATTERN WILL TRANSPORT SLIGHTLY WARMER AIR INTO OUR
AREA...ALONG WITH ABUNDANT MOISTURE FOR MODERATE AMOUNTS OF
PRECIPITATION AT ALL ELEVATIONS...MOSTLY FALLING SATURDAY NIGHT
AND SUNDAY MORNING. SNOW LEVELS SATURDAY NIGHT WILL RANGE FROM
4000 FEET IN THE NORTH TO 5000 FEET ALONG THE NEVADA BORDER. ON
SUNDAY SNOW LEVELS WILL RISE CONSIDERABLY...RANGING FROM 5500 FEET
IN THE CENTRAL IDAHO MOUNTAINS TO 8000 FEET IN SOUTHEAST OREGON.
SNOW ACCUMULATIONS OF 6 TO 12 INCHES ARE POSSIBLE IN THE CENTRAL
IDAHO MOUNTAINS ABOVE 5500 FEET BY SUNDAY NIGHT. A CHANCE OF SNOW
WILL CONTINUE OVER THE MOUNTAINS THROUGH MONDAY...WITH A CHANCE OF
RAIN SHOWERS BELOW 6000 FEET. TEMPERATURES WILL REMAIN ABOVE
NORMAL BY 5 TO 15 DEGREES...WITH MONDAY THE WARMEST DAY.

MONDAY NIGHT THROUGH WEDNESDAY...THE REGION WILL BE UNDER THE
INFLUENCE OF A NORTHWEST FLOW WHICH WILL CARRY ENOUGH MOISTURE TO
BRING A CHANCE OF PRECIPITATION TO THE WEST CENTRAL AND BOISE
MOUNTAINS. BY WEDNESDAY AFTERNOON...A SHORTWAVE WILL MOVE INTO THE
REGION FROM THE WEST BRINGING PRECIPITATION TO MOST OF SOUTHEAST
OREGON AND SOUTHWEST IDAHO. TEMPERATURES WILL REMAIN 5-10 DEGREES
ABOVE NORMAL AND WILL COOL SLIGHTLY WITH THE SHORTWAVE. SNOW LEVELS
WILL DROP AS WELL...COMING DOWN TO ABOUT 3000 TO 3500 FEET IN THE
BLUE/WEST CENTRAL/BOISE MOUNTAINS BY WEDNESDAY NIGHT...ALLOWING
PRECIPITATION TO COME IN THE FORM OF SNOW.

&&

.AVIATION...SCATTERED SNOW SHOWERS WITH AREAS OF MVFR CEILINGS AND
LOCAL IFR CONDITIONS WILL SPREAD FROM EASTERN OREGON INTO THE
CENTRAL IDAHO MOUNTAINS TONIGHT. ON THURSDAY SNOW SHOWERS WILL
CONTINUE OVER THE CENTRAL IDAHO MOUNTAINS WITH VFR CONDITIONS
ELSEWHERE UNDER MOSTLY CLOUDY SKIES. SURFACE WINDS...EAST TO SOUTH 5-
10 KTS. WINDS ALOFT...SOUTHWEST 10-15 KTS UP THROUGH 10K FT MSL.


&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...SP
LONG TERM....JT/AB
AVIATION.....JT


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