Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 242219
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
319 PM MST WED DEC 24 2014

.SHORT TERM...TONIGHT THROUGH FRIDAY...STRONG PACIFIC SYSTEM
CURRENTLY MOVING THROUGH THE AREA WITH THE CENTER OF THE SYSTEM
MOVING INTO NORTHERN CALIFORNIA. EXPECT PRECIPITATION TO CONTINUE
THROUGH THE EVENING AND TAPER OFF BEHIND THE COLD FRONT IN THE
VALLEYS WITH TERRAIN INDUCED SHOWERS CONTINUING THROUGH CHRISTMAS
DAY. SNOW LEVELS ARE TRICKY AS COLD AIR REMAINS TRAPPED IN THE
MOUNTAIN VALLEYS AND THE LOWER TREASURE VALLEY. THE COLD AIR DID
NOT SCOUR OUT OF THE VALLEY AS EXPECTED. WITH THE WARM TEMPS ALOFT
WE EXPECT A COLD RAIN SNOW MIX TO FALL IN THE TREASURE VALLEY
BEFORE CHANGING TO SNOW WITH THE COLD FRONT. AN IMPRESSIVE SURFACE
PRESSURE GRADIENT FORMS LATER THIS AFTERNOON OVER SOUTHEAST OREGON
AND THE SNAKE RIVER BASIN AND AREAS SOUTH. EXPECT WIND GUSTS UP TO
45 MPH WITH THE FRONTAL PASSAGE. A STIFF COLD NORTHWESTERLY WIND
WILL CONTINUE ON CHRISTMAS DAY AS THE AREA DRIES OUT. FRIDAY COOL
UPPER LEVEL FLOW COMBINED WITH ANY FRESH SNOW THAT FALLS WILL BE
MUCH COOLER THAN WE HAVE BEEN SEEING OVER THE PAST FEW WEEKS.

.LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...DRY AND SEASONABLY
COLD CONDITIONS CONTINUE INTO SATURDAY. BY SATURDAY AFTERNOON THE
EAST-CENTRAL OREGON AND WEST-CENTRAL ID MTNS WILL SEE LIGHT SNOW
DEVELOP AHEAD OF SHORT WAVE TROUGH AND ACCOMPANYING COLD FRONT
DROPPING DOWN THE BC COAST. THE COLD FRONT WILL MOVE THROUGH THE
AREA SUNDAY NIGHT WITH POST-FRONTAL SNOW FOR MUCH OF SE OREGON AND
SW IDAHO. PRECIP AMOUNTS WILL BE LIGHT WITH LIQUID EQUIVALENTS OF UP
TO 2 TENTHS OF AN INCH IN THE VALLEYS AND 4 TENTHS OF AN INCH IN THE
MTNS. IT WILL BE COLD ENOUGH ON SUNDAY TO SEE SNOW DOWN TO VALLEY
FLOORS. COLD NORTHERLY FLOW FOLLOWS THIS SYSTEM FOR NEXT WEEK AS A
1050 MB SURFACE HIGH WORKS DOWN THE EAST SIDE OF THE DIVIDE. WITH
BUILDING HEIGHTS ALOFT A STRENGTHENING INVERSION IS EXPECTED BY THE
MIDDLE OF NEXT WEEK.

&&

.AVIATION...IFR IN THE MTNS THROUGH TONIGHT...OBSCURING TERRAIN.
ELSEWHERE ACROSS SE OREGON AND SW IDAHO WIDESPREAD MVFR WITH AREAS
OF IFR IN SNOW BELOW 4K FEET MSL THROUGH TONIGHT. COLD FRONT WILL
BRING GUSTY WINDS WITH SPEEDS OF 20 TO 35 KTS ACROSS TO SE OREGON
BETWEEN 23Z AND 04Z AND 00Z AND 07Z IN SW IDAHO. WINDS ALOFT WILL
SHIFT FROM THE SW TO NW THIS EVENING WITH SPEEDS OF 30 TO 50 KTS AT
10K FEET MSL. IFR IN SNOW SHOWERS WILL CONTINUE IN THE MTNS ON
CHRISTMAS WHILE SITES BELOW 4K FEET IMPROVE TO VFR.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...WINTER WEATHER ADVISORY UNTIL 5 AM MST THURSDAY
     IDZ014>016-028>030.
     WINTER WEATHER ADVISORY UNTIL 11 PM MST THIS EVENING
     IDZ011>013-033.
OR...WINTER WEATHER ADVISORY UNTIL 11 PM MST /10 PM PST/ THIS EVENING
     ORZ061>064.

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...KA
LONG TERM....DG/WH
AVIATION.....DG


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