025
FXUS65 KBOI 220956
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
256 AM MST MON DEC 22 2025
SHORT TERM...TODAY THROUGH WEDNESDAY NIGHT
AN UPPER LEVEL
TROUGH REMAINS OVER HAIDA GWAII THIS MORNING, GIVING US MOIST
SOUTHWEST FLOW ALOFT. A BAND OF MODERATE PRECIPITATION EXTENDS
FROM LAKEVIEW OR TO ONTARIO OR TO MCCALL ID. THIS BAND WILL
SLOWLY MOVE SOUTH BY MID MORNING AND WEAKEN OVER THE MAGIC
VALLEY BY THIS AFTERNOON WITH PARTIAL CLEARING OVER MUCH OF THE
AREA. TEMPERATURES REMAIN MILD TODAY, WITH SNOW LEVELS AROUND
5000 FEET NEAR BAKER/BURNS OR TO 8000 FEET NEAR TWIN FALLS.
LATE MONDAY NIGHT INTO TUESDAY MORNING, THIS BAND OF
PRECIPITATION WILL MOVE NORTHWARD ACROSS THE AREA AND EXTEND
FROM BAKER CITY OR OR MCCALL ID, WITH DRY AND WARM CONDITIONS TO
THE SOUTH TUESDAY AFTERNOON. TEMPERATURES IN THE SNAKE PLAIN
WILL BE IN THE MID TO UPPER 50S TUESDAY AFTERNOON, OR AROUND
15-20 DEGREES ABOVE NORMAL. SOUTHEAST WINDS INCREASE ON
WEDNESDAY MORNING, WITH MILD OVERNIGHT LOWS. ON WEDNESDAY THE
UPPER LEVEL LOW BEGINS TO DIG SOUTH ALONG THE WEST COAST,
ALLOWING FOR MILD SOUTHERLY FLOW TO INCREASE OVER THE REGION.
WINDY CONDITIONS EXPECTED FOR MUCH OF WEDNESDAY IN THE WARM
SECTOR OF THE SYSTEM. PRECIPITATION INCREASES LATE IN THE
AFTERNOON, WITH RAIN SHOWERS OVER MUCH OF THE AREA AND SNOW
LEVELS AROUND 7500-8000 FEET. BOISE AND MCCALL WILL BE NEAR
RECORD HIGHS BOTH TUESDAY AND WEDNESDAY AFTERNOONS!
LONG TERM...THURSDAY THROUGH MONDAY
THE DEEP UPPER LOW THAT
HAS CONTINUED TO STEER MOISTURE THROUGH THE REGION WILL BEGIN
TO MOVE INLAND THURSDAY. THIS WILL LEAD TO CONTINUED
PRECIPITATION BUT WITH GUSTY RIDGETOP WINDS AND LOWER SNOW
LEVELS THROUGH SATURDAY. PRECIPITATION IS LIKELY FOR MUCH OF THE
AREA AS SNOW LEVELS THURSDAY DROP FROM 5-6 KFT MSL TO 3-4 KFT
MSL BY FRIDAY EVENING. WHILE THIS BEGINS TO HINT AT WINTRY
PRECIPITATION FOR LOWER ELEVATIONS BY SATURDAY, SNOW LEVELS DROP
TO VALLEY FLOORS AS THE UPPER LOW AND PRECIPITATION MOVE
EAST/TAPER OFF. THUS, LOWER ELEVATIONS WILL SEE MOSTLY RAIN WITH
TOTALS OF LESS THAN 0.25". LIQUID EQUIVALENT OR RAIN TOTALS IN
MOUNTAINS WILL BE CLOSER TO 1". MOUNTAIN TOWNS WILL SEE 1-5" AS
SNOW LEVELS DROP, WHILE RIDGES SEE 6-10". TEMPERATURES THURSDAY
OF 10-15 DEGREES ABOVE NORMAL COOL DOWN TO 5 DEGREES ABOVE
NORMAL BY SATURDAY AS THE CENTER OF THE LOW MOVES OVERHEAD.
SATURDAY NIGHT THROUGH MONDAY, TEMPS HOLD STEADY AT JUST ABOVE
NORMAL FOR THIS TIME OF YEAR AS MOST OF THE GUIDANCE SUGGESTS A
RIDGE BUILDING OVERHEAD. THE RIDGE AND INCREASING HEIGHTS ALOFT
WITH TEMPS HOLDING STEADY SHOWS SOME EARLY SIGNS OF A POTENTIAL
INVERSION. IF ANY INVERSION DOES FORM, IT SEEMS LIKE IT MAY
SHORTLIVED AS THE EXTENDED FORECAST SHOWS A RETURN TO UNSETTLED
WEATHER NEXT WEEK.
AVIATION
A PLUME OF CLOUDS AND PRECIPITATION OVER THE AREA
CONTINUES THROUGH THIS MORNING, TAPERING OFF AND MOVING SE IN
THE AFTERNOON. MVFR-LIFR IN STRATUS/FOG ALONG A WARM FRONT
PERSISTS THROUGH THE MORNING, WITH RAPIDLY VARYING CONDITIONS IN
PRECIPITATION. WIDESPREAD IMPROVEMENT LATER THIS AFTERNOON AND
EVENING. SNOW LEVELS 6-8 KFT MSL. AREAS OF LLWS. SURFACE WINDS:
SE- SW 5-15 KT. WINDS ALOFT AT 10KFT MSL: W-SW 30-50KT.
KBOI...STRONG SE WINDS SCOURED OUT MIST/LOW CLOUDS AND LIFTED
PRECIPITATION. WHILE BOTH REMAIN IN THE VICINITY OVER THE
FOOTHILLS, THEY ARE UNLIKELY TO IMPACT THE TERMINAL TONIGHT
OUTSIDE OF SPORADIC LIGHT RAIN. IMPROVED CONDITIONS LAST THROUGH
THE EVENING. SURFACE WINDS SE AROUND 7-14 KT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...KA
LONG TERM....JM
AVIATION.....JM
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