330
FXUS65 KBOI 191708
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1008 AM MST FRI DEC 19 2025
DISCUSSION
A COLD FRONT WILL MOVE ACROSS THE AREA FROM NORTH
TO SOUTH THIS AFTERNOON. A LINE OF SHOWERS WILL ACCOMPANY THE
FRONT, BRINGING PRECIPITATION TO ALL AREAS. WEAK INSTABILITY
ALONG THE FRONT WILL ALLOW EMBEDDED HEAVIER SHOWERS TO DEVELOP
ALONG WITH A 10% CHANCE OF THUNDERSTORMS. HOWEVER, INSTABILITY
LOOKS TO BE WEAKER THAN WEDNESDAY'S COLD FRONT, SO IMPACTS DO
NOT LOOK TO BE AS SIGNIFICANT. SNOW LEVELS AROUND 6-7KFT MSL
THIS MORNING WILL LOWER TO VALLEY FLOORS BEHIND THE FRONT, WITH
POTENTIAL FOR RAIN MIXING WITH SNOW AS PRECIPITATION ENDS IN
THE TREASURE AND MAGIC VALLEYS. MOUNTAIN VALLEYS WILL SEE LIGHT
SNOW ACCUMULATIONS (MOSTLY LESS THAN AN INCH) WITH THE FRONT.
AHEAD OF THE FRONT, SOUTHWEST WINDS WILL BE GUSTY ACROSS
HARNEY/MALHEUR COUNTIES IN OREGON, AND SOUTH OF THE SNAKE RIVER
IN SOUTHWEST IDAHO, WHERE A WIND ADVISORY REMAINS IN EFFECT
THROUGH THIS AFTERNOON. ELSEWHERE, GUSTY WINDS TO AROUND 45 MPH
ARE POSSIBLE AS THE FRONT MOVES THROUGH, ESPECIALLY IN ANY
CONVECTIVE SHOWERS. HIGH TEMPERATURES WILL BE VERY MILD FOR MID
DECEMBER, ESPECIALLY IN SOUTHERN AREAS THAT WILL SEE A FRONTAL
PASSAGE LATE IN THE AFTERNOON OR EARLY IN THE EVENING. FORECAST
REMAINS ON TRACK AND NO UPDATES THIS MORNING.
AVIATION
AREAS OF LLWS THROUGH FRIDAY AFTERNOON ACROSS THE
SNAKE PLAIN (KBOI-KTWF/KJER). IFR IN SNOW ACROSS E-CENTRAL
OREGON AND MTNS OF W-CENTRAL IDAHO OBSCURING TERRAIN. SNOW
LEVELS: 6-8 KFT MSL. SURFACE WINDS: SW-SE 10-25 KT WITH GUSTS TO
25-45 KT, STRONGEST S AND W OF THE SNAKE PLAIN. BECOMING W-NW
10-20 KT WITH GUSTS TO 20-45 KT, STRONGEST S OF THE SNAKE PLAIN.
WINDS ALOFT AT 10KFT MSL: W-SW 45-65 KT.
KBOI...MOSTLY VFR. LLWS INTO EARLY AFTERNOON. RAIN SHOWERS
RETURNING AFTER FRI/21Z ALONG A COLD FRONT BRINGING BRIEF MVFR.
SE SURFACE WINDS BECOMING NW 10-15 KT WITH GUSTS TO 25-30 KT
THIS AFTERNOON BEHIND THE FRONT.
WEEKEND OUTLOOK...SHOWERS TAPERING OFF SATURDAY WITH LINGERING
MTN OBSCURATION AND PATCHY AM FOG. WIDESPREAD RAIN/SNOW SUNDAY.
SNOW LEVELS 3K-5KFT MSL TO NORTH, 6K-7KFT TO SOUTH, RISING
THROUGHOUT DAY. MTNS OBSCURED. SURFACE WINDS: SW-SE 5-15 KT
SATURDAY. SW-SE 10- 20 KT WITH GUSTS TO 20-30 KT SUNDAY.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH SUNDAY NIGHT...A COLD FRONT EXTENDS
FROM MEDFORD OR TO PENDLETON OR THIS MORNING AND IS MOVING
SLOWLY SOUTHEAST WITH A STREAM OF MOISTURE EXTENDING PAST
HAWAII. SOUTHEAST OR AND SOUTHWEST ID REMAIN IN THE WARM SECTOR
OF THE SYSTEM WITH STRONG WINDS OVER SOUTHERN HARNEY AND
MALHEUR COUNTIES, AND SOUTH OF THE SNAKE BASIN IN IDAHO.
TEMPERATURES WILL BE 15-20 DEGREES ABOVE NORMAL TODAY.
PRECIPITATION WILL BE FOCUSED OVER THE WEST CENTRAL ID
MOUNTAINS, BOISE MOUNTAINS UNTIL THE COLD FRONT MOVES OVER THE
AREA THIS AFTERNOON. A WIND ADVISORY REMAINS IN EFFECT FOR
SOUTHERN HARNEY AND MALHEUR COUNTIES AND SOUTH OF THE SNAKE
PLAIN IN IDAHO THROUGH 5PM MST THIS EVENING. SIGNIFICANT SNOW
ACCUMULATIONS WILL BE CONFINED TO THE HIGHEST PEAKS ABOVE 7000'
MSL UNTIL THE COLD FRONT MOVES SOUTH. AS THE FRONT STARTS TO
MOVE SOUTH, SNOW LEVELS FALL TO THE VALLEY FLOORS AS THE
PRECIPITATION SHUTS OFF BEHIND THE FRONT, SO A BRIEF WINTRY MIX
POSSIBLE, BUT MINIMAL ACCUMULATIONS EXPECTED. HEAVY SHOWERS AND
A RUMBLE OF THUNDER POSSIBLE (10 PERCENT CHANCE) ALONG THE COLD
FRONT. SNOW SHOWERS LINGER INTO SATURDAY MORNING OVER SOUTHERN
OWYHEE COUNTY AND SOUTHERN MAGIC VALLEY. DRY CONDITIONS EXPECTED
FOR MOST OF SATURDAY UNTIL THE NEXT SYSTEM ARRIVES LATE
SATURDAY. PRECIPITATION BECOMES WIDESPREAD EARLY SUNDAY MORNING.
SNOW LEVELS WILL BE AROUND 3500' IN BAKER COUNTY AND NEAR THE
WEISER BASIN, WITH 7000-8000' FROM THE SNAKE BASIN SOUTH. SNOW
IS EXPECTED FROM BURNS TO ONTARIO INITIALLY BEFORE CHANGING TO
RAIN. MODERATE SNOW ACCUMULATIONS EXPECTED OVER THE MOUNTAINS
ABOVE 7000 FEET AGAIN.
LONG TERM...MONDAY THROUGH FRIDAY...MILD, ACTIVE PATTERN
CONTINUES THROUGH THE LONG TERM. A BROAD UPPER LEVEL TROUGH WILL
REMAIN OVER HAIDA GWAII, CONTINUING TO DIRECT AN ATMOSPHERIC
RIVER OVER THE AREA ON MONDAY. LOWER SNOW LEVELS (4000-5000')
WILL REMAIN NORTHWEST OF A LINE FROM BURNS OR TO MCCALL ID, WITH
WARMER AIR SOUTH AND EAST (7000-8000') ALONG THE SNAKE BASIN
AND AREAS SOUTH. SOUTHWEST FLOW CONTINUES INTO WEDNESDAY WITH
SIGNIFICANT PRECIPITATION OVER THE MOUNTAINS THROUGH THIS TIME
PERIOD. 1-2 INCHES OF LIQUID EQUIVALENT EXPECTED MONDAY THROUGH
WEDNESDAY OVER THE CENTRAL ID MOUNTAINS, WITH 10 TO 20 INCHES OF
SNOW ABOVE 6500-7500'. THE FLOW TURNS SOUTHERLY AND WARM ON
WEDNESDAY WITH TEMPERATURES WARMING INTO THE MID 50S AGAIN IN
THE SNAKE PLAIN. MILD AND UNSETTLED CONDITIONS CONTINUE THURSDAY
AND FRIDAY WITH SNOW LEVELS LOWERING TO 3500-5000'. SLIGHTLY
COOLER TEMPERATURES EXPECTED ON THURSDAY AND FRIDAY BUT STILL
WELL ABOVE NORMAL.
BOI WATCHES/WARNINGS/ADVISORIES
ID...WIND ADVISORY UNTIL 5 PM MST THIS AFTERNOON IDZ015-029-030.
OR...WIND ADVISORY UNTIL 5 PM MST /4 PM PST/ THIS AFTERNOON
ORZ061-063.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
DISCUSSION...ST
AVIATION.....DG
SHORT TERM...KA
LONG TERM....KA
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