Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 221009
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
309 AM MST MON DEC 22 2014

.SHORT TERM...TODAY THROUGH TUESDAY...LONG FETCH OF DEEP PACIFIC
MOISTURE STREAMING INTO THE REGION WILL END BY MIDDAY AS AN UPPER
RIDGE AMPLIFIES OFF THE WEST COAST...THEREBY PINCHING OFF THE
MOIST NW FLOW. LATEST RADAR IMAGES CONTINUE TO SHOW LIGHT
PRECIPITATION IN THE MOIST NW FLOW MOVING THROUGH PORTIONS OF SE
OREGON AND SW IDAHO...INCLUDING THE TREASURE VALLEY...EARLY THIS
MORNING. THE PRECIP WILL GRADUALLY LESSEN THROUGH THE MORNING AND
BECOME SPOTTY THIS AFTERNOON. PRECIP WILL END THIS EVENING AS THE
AMPLIFYING RIDGE STARTS TO WORK EASTWARD TOWARD THE AREA. THE
RIDGE WILL MOVE INTO THE AREA ON TUESDAY FOR DRY WEATHER ACROSS
ALL OF SE OREGON AND SW IDAHO. CLEARING SKIES AND LIGHTER
WINDS...ALONG WITH MOISTURE FROM RECENT PRECIP...WILL LEAD TO
PATCHY VALLEY FOG LATE TONIGHT THROUGH TUESDAY MORNING.

WINDS WILL INCREASE AND BECOME WINDY ESPECIALLY IN THE WESTERN
MAGIC VALLEY LATER THIS AFTERNOON. WINDS WILL DIMINISH THIS
EVENING. LIGHT WINDS ARE EXPECTED ON TUESDAY AS HIGH PRESSURE
BUILDS INTO THE REGION. TEMPERATURES WILL REMAIN ABOVE
NORMAL...ALTHOUGH THE HIGHS ON TUESDAY WILL BE SLIGHTLY COOLER
THAN TODAY.

.LONG TERM...TUESDAY NIGHT THROUGH MONDAY. DRIER CONDITIONS WILL
CONTINUE TUESDAY NIGHT THROUGH MID DAY WEDNESDAY AS THE HIGH
PRESSURE SITTING OFF OF THE CALIFORNIA COAST BEGINS TO FLATTEN
OUT. THE NEXT TROUGH AND ASSOCIATED COLD FRONT ARE SET TO MOVE
INTO THE AREA ON WEDNESDAY NIGHT/THURSDAY MORNING. MODELS ARE IN
DECENT AGREEMENT OF A COLD FRONT MOVING THROUGH FROM NW TO SE
BETWEEN 03Z AND 15Z THURSDAY MORNING. HOWEVER...THE ECMWF AND GFS
NOW AGREE ON BRINGING THE MAIN CENTER OF THE TROUGH TO OUR
SOUTH...WHICH DELAYS THE COLD FRONT SLIGHTLY...WHILE THE NAM IS A
BIT QUICKER WITH THIS SYSTEM. NONETHELESS...IT WILL BRING COLDER
TEMPERATURES AND DROP SNOW LEVELS TO OR NEAR VALLEY FLOORS BEHIND
THE FRONT...AND AFTER THE BULK OF MOISTURE. CONDITIONS WILL DRY
AND REMAIN COLD AS THE AREA TRANSITIONS INTO A NORTHWEST FLOW
LATER ON THURSDAY. YET ANOTHER TROUGH IS EXPECTED THIS WEEKEND
WITH A MUCH MORE NORTHERLY FETCH WHICH WILL BRING ANOTHER CHANCE
OF PRECIP...MAINLY SNOW...AND KEEP TEMPERATURES AT OR BELOW
NORMAL.

&&

.AVIATION...VFR/MVFR CONDITIONS AND RAIN SHOWERS ARE EXPECTED TO
CONTINUE THROUGH THIS MORNING AND BEGIN TO TAPER OFF THROUGH THE
DAY. KMYL AND OTHER LOCATIONS IN THE CENTRAL MOUNTAINS WILL SEE
IFR CEILINGS AND MOUNTAIN OBSCURATION THIS MORNING BUT CONDITIONS
SHOULD IMPROVE LATER TODAY. THE THREAT OF FOG WILL EXIST EARLY
TUESDAY MORNING IN VALLEY LOCATIONS. SURFACE WINDS WILL BE
GENERALLY FROM THE NORTHWEST AT 10-15KTS BUT WILL BE GUSTY ON
MONDAY AFTERNOON IN THE TREASURE AND MAGIC VALLEYS. WINDS ALOFT
NEAR 10K FT MSL...NORTHWEST AT 45 TO 60 KTS...DECREASING TO 25 TO
35 KTS AFTER 23/09Z.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...BW
LONG TERM....EP
AVIATION.....EP


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