235
FXUS65 KBOI 181034
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
334 AM MST WED DEC 18 2024
SHORT TERM...TODAY THROUGH FRIDAY NIGHT
A WEAK PACIFIC WARM
FRONT PASSED THROUGH OUR CWA TUESDAY EVENING WITH LIGHT RAIN
AND SNOW IN CENTRAL AND NORTHERN AREAS. A PACIFIC COLD FRONT
WILL PASS THROUGH LATER TODAY WITH LIGHT RAIN AND SNOW AGAIN
IN NORTHERN AREAS. TOTAL NEW SNOWFALL SHOULD BE LESS THAN ONE
INCH. LIGHT TO MODERATE SURFACE WINDS AND INCREASED WESTERLY
FLOW ALOFT UNDER THE ASSOCIATED UPPER TROUGH WILL KEEP FOG OUT
OF THE VALLEYS TODAY EXCEPT NEAR WEISER/ID AND ONTARIO/OR.
TEMPERATURES WILL BE MILD AGAIN TODAY. AFTER THE UPPER TROUGH
EXITS EAST THIS EVENING AN UPPER RIDGE WILL COME IN FROM THE
PACIFIC AND LAST THROUGH SATURDAY MORNING. THE RIDGE WILL BRING
IN WARMER AIR ALOFT RESULTING IN AN INVERSION IN THE VALLEYS
BELOW. AREAS OF FOG AND LOW CLOUDS WILL DEVELOP THURSDAY AND
FRIDAY ESPECIALLY IN THE LOWER TREASURE VALLEY. DAYTIME
TEMPERATURES WILL BE COLDER BELOW ABOUT 3500 FEET MSL. NO
PRECIPITATION THURSDAY THROUGH FRIDAY NIGHT.
LONG TERM...SATURDAY THROUGH WEDNESDAY
A VERY PROGRESSIVE
PATTERN WILL DEVELOP LATE SATURDAY AND ALLOW THE STORM DOOR
TO BURST WIDE OPEN FOR THE PACIFIC NORTHWEST. A SERIES OF
TROUGHS ARE EXPECTED TO ARRIVE DAILY THROUGH AT LEAST NEXT
WEEK. THE FIRST TROUGH LATE SATURDAY WILL HELP ERODE SOME OF
THE VALLEY COLD POOLS THAT WILL HAVE BEEN IN PLACE AND IMPROVE
THE STAGNANT VALLEY CONDITIONS. THE MORE STUBBORN COLD POOLS
SHOULD FOLLOW SUIT BY LATE WEEKEND/EARLY NEXT WEEK. SNOW LEVELS
WILL OSCILLATE WITH THE ARRIVAL AND DEPARTURE OF EACH TROUGH,
WITH SNOW LEVELS ROUGHLY 3000-5000 FT MSL FOR THE NORTHERN ZONES
AND 5000-7000 FT MSL FOR THE SOUTHERN ZONES CLOSER TO THE NV
BORDER. EACH NEW TROUGH IS FORECAST TO BE COLDER THAN THE LAST
AS THE UPPER LEVEL RIDGE BECOMES DISPLACED. WINDS WILL ALSO
INCREASE WITH EACH TROUGH, ESPECIALLY MID TO LATE NEXT WEEK.
SNOW TOTALS MAY BECOME SIGNIFICANT FOR HIGH ELEVATIONS FROM
THIS MULTI-DAY EVENT.
AVIATION
PATCHY VALLEY FOG THIS MORNING. LIGHT RAIN AND SNOW
WILL BRING BRIEF MVFR/IFR AND LOCAL LIFR CONDITIONS THROUGH
21Z/WED, MOSTLY NORTH OF KBNO-KBOI-KJER. SNOW LEVELS 4000-6000
FT MSL. MOUNTAINS OBSCURED. SURFACE WINDS: SE-SW 5-15 KT, EXCEPT
LIGHT AND VARIABLE IN SHELTERED VALLEYS. WINDS ALOFT AT 10KFT
MSL: W-SW 25-45 KT. AREAS OF LOW LEVEL WIND SHEAR THIS MORNING.
KBOI...VFR. BRIEF LIGHT RAIN POSSIBLE WED/17Z-20Z. FOG WILL
DEVELOP IN LOWER TREASURE VALLEY (KONO/KEUL) TONIGHT THROUGH
THURSDAY MORNING, WITH A 30% CHANCE OF LIFR FOG REACHING KBOI
THU MORNING. SURFACE WINDS: SE 8-14 KT, THEN SE OR VARIABLE UP
TO 5 KT THIS EVENING.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.TWITTER.COM/NWSBOISE
SHORT TERM...LC
LONG TERM....SH
AVIATION.....SH
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