490
FXUS65 KBOI 162247
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
347 PM MST MON DEC 16 2024
SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT
THERE WILL BE A
BRIEF BREAK IN THE RAIN AND SNOW THIS EVENING BEFORE ANOTHER
ROUND STARTS UP LATER TONIGHT AND TUESDAY. COLD AIR REMAINS
TRAPPED IN SHELTERED VALLEYS OF E-CENTRAL OREGON AND THE
MOUNTAINS OF W-CENTRAL IDAHO WHICH HAS LED TO A HEAVY WET SNOW
TODAY. OPEN VALLEYS, LIKE THE SNAKE PLAIN HAVE SEEN SNOW CHANGE
OVER TO RAIN AS SNOW LEVELS PUSH 4-4500 FEET AND TEMPERATURES
HAVE WARMED ABOVE FREEZING. AREAS THAT HAVE SEEN THE COLD AIR
SCOURED OUT WILL STAY RAIN OVERNIGHT, OTHERWISE SNOW WILL
CONTINUE IN MTNS AND COLD VALLEYS. HAVE ADDED THE BOISE MTNS AND
CAMAS PRAIRIE TO THE WINTER WEATHER ADVISORY TO CATCH THE
ADDITIONAL 2 TO 5 INCHES EXPECTED IN VALLEYS AND 4 TO 8 ACROSS
HIGHER ELEVATIONS. THIS IS ON TOP OF WHAT HAS FALLEN THROUGH
TODAY.
SNOW SHOWERS CONTINUE IN THE MOUNTAINS THROUGH WEDNESDAY WHILE
VALLEYS BEGIN TO DRY OUT. ADDITIONAL ACCUMULATIONS WILL BE LESS
THAN 2" AND FOCUSED OVER THE HIGHER PEAKS OF E-CENTRAL OREGON
AND W-CENTRAL IDAHO MTNS. WITH WARMER AIR BEGINNING TO MOVE IN
ALOFT, EXPECT LOWER VALLEYS TO START SETTING UP UNDER AN
INVERSION, WHICH WILL LIMIT WARMING. GIVEN THE CURRENT
RAIN/SNOW THERE WILL BE PLENTY OF MOISTURE FOR FOG/STRATUS
DEVELOPMENT ONCE SKIES CLEAR OUT WEDNESDAY EVENING.
LONG TERM...THURSDAY THROUGH MONDAY
A DRY PATTERN AMIDST
UPPER RIDGING WILL INITIALLY BE IN PLACE THURSDAY/FRIDAY,
BEFORE A TRANSITION TO A MUCH MORE ACTIVE AND WETTER REGIME
TAKES PLACE SATURDAY THROUGH EARLY NEXT WEEK. A FAVORABLE SETUP
FOR INVERSIONS IS LIKELY THURSDAY/FRIDAY, POTENTIALLY RESULTING
IN STAGNANT CONDITIONS. RIDGE BREAKDOWN LOOKS INCREASINGLY
LIKELY TO OCCUR SATURDAY, WITH A REDUCTION IN INVERSION
POTENTIAL. PRECIPITATION CHANCES INCREASE LATE SATURDAY AND
REMAIN ELEVATED THROUGH MONDAY. SNOW LEVELS ARE LIKELY TO REMAIN
HIGH DURING THIS TIME, GENERALLY 4500 FEET OR HIGHER, WHICH
WILL LIMIT ACCUMULATING SNOWFALL POTENTIAL PRIMARILY TO MOUNTAIN
AND HIGHER VALLEY LOCATIONS.
AVIATION
PERIODS OF RAIN/SNOW THROUGH THIS EVENING. MVFR TO
LIFR CONDITIONS IN PRECIP. MOUNTAINS OBSCURED. SNOW LEVELS
3500-4500 FEET MSL. RAIN/SNOW COVERAGE INCREASING INTO EARL TUE
MORNING FOR MOST AREAS, AND DECREASING AFTER TUE/18Z. SURFACE
WINDS: SE-SW 5-15 KT. GUSTS 20-35 KT IN SOUTHEAST OREGON AND
NEAR THE NV BORDER. WINDS ALOFT AT 10KFT MSL: W-SW 20-40 KT.
KBOI...INTERMITTENT RAIN THIS AFTERNOON AND EVENING, BEFORE
HIGHER RAIN CHANCES RETURN AFTER TUE/06Z. CIGS DROPPING TO 1500
FEET IN PRECIPITATION, OTHERWISE 3000-4000 FT. SURFACE WINDS:
SE 10-15 KT THIS AFTERNOON. SE AROUND 5 KT LATE TONIGHT AND TUE
MORNING.
BOI WATCHES/WARNINGS/ADVISORIES
ID...WINTER WEATHER ADVISORY UNTIL 5 AM MST TUESDAY
IDZ011-013-028-033.
OR...WINTER WEATHER ADVISORY UNTIL 4 AM PST TUESDAY ORZ062.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.TWITTER.COM/NWSBOISE
SHORT TERM...DG
LONG TERM....JR
AVIATION.....JR
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