378
FXUS65 KBOI 181000
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
300 AM MST TUE FEB 18 2025
SHORT TERM...TODAY THROUGH THURSDAY NIGHT
MORNING FOG PERSISTS THROUGH MUCH OF THE SNAKE PLAIN INTO
EASTERN OREGON THIS MORNING AS LOW-LEVEL MOISTURE REMAINS IN
PLACE. MOST PRECIPITATION HAS ENDED ACROSS THE REGION, OUTSIDE
OF A FEW PASSING LIGHT SHOWERS THIS MORNING. A BRIEF RESPITE IN
OUR WET PATTERN WILL OCCUR TODAY, BEFORE THE NEXT PACIFIC SYSTEM
MOVES INTO THE NORTHWEST. PRECIPITATION CHANCES INCREASE ACROSS
EASTERN OREGON EARLY WEDNESDAY MORNING, SPREADING INTO WESTERN
IDAHO BY LATE WEDNESDAY MORNING. SNOW LEVELS INITIALLY WILL BE
NEAR VALLEY FLOORS AS PRECIPITATION COMMENCES, BUT ARE EXPECTED
TO RISE THROUGHOUT THE DAY WEDNESDAY TO AROUND 4000-5000 FEET,
FAVORING A TRANSITION TO RAIN IN THE LOWER ELEVATION VALLEYS.
COLDER AIR BRIEFLY RETURNS THURSDAY MORNING, WITH SNOW LEVELS
FALLING BACK DOWN NEAR VALLEY FLOORS, ALTHOUGH PRECIPITATION
WILL BE MORE ISOLATED AT THIS POINT. SNOW TOTALS IN THE
MOUNTAINS ARE GENERALLY EXPECTED TO RANGE BETWEEN 6 TO 10
INCHES ABOVE 6000 FEET. DRIER AIR WILL QUICKLY MOVE IN LATER
THURSDAY.
LONG TERM...FRIDAY THROUGH TUESDAY
BROAD RIDGING BUILDS OVER THE NORTHWEST BY THE WEEKEND WITH DRY
CONDITIONS AND A SLIGHT WARMING TREND EXPECTED FRIDAY INTO MUCH
OF SATURDAY. ENSEMBLE GUIDANCE IS SHOWING AN INCREASING SIGNAL
FOR MORE PRECIPITATION LATE SATURDAY INTO SUNDAY, ESPECIALLY IN
THE BOISE MOUNTAINS AND WEST-CENTRAL MOUNTAINS. SNOW LEVELS WILL
GENERALLY BE AT OR ABOVE 6000 FEET FOR THIS EVENT, LIMITING
SNOWFALL TO HIGHER MOUNTAIN TERRAIN. ADDITIONAL EMBEDDED
DISTURBANCES IN WESTERLY FLOW AROUND THE RIDGE CONTINUE INTO
EARLY NEXT WEEK ALONG WITH ASSOCIATED INTERMITTENT INCREASES IN
PRECIPITATION CHANCES. ADDITIONALLY, ENSEMBLE GUIDANCE HAS A
STRONG SIGNAL FOR THE WARMEST TEMPERATURES OF THE YEAR SO FAR
MONDAY AND TUESDAY, WITH MANY LOWER ELEVATION LOCATIONS TOPPING
OUT IN THE 50S.
AVIATION
AREAS OF FOG AND LOW CEILINGS DEGRADING FLIGHT
CATEGORIES AT MOST TAF SITES, WITH IMPROVEMENT TUE AFTERNOON.
MAINLY VFR/MVFR TUESDAY AFTERNOON AND EVENING. WIDESPREAD
SHOWERS REDEVELOPING WEDNESDAY MORNING IN EASTERN OREGON AND FAR
SOUTHWEST IDAHO. SURFACE WINDS: VARIABLE 10 KT OR LESS
OVERNIGHT, EXCEPT W-SW 10-15 KT FOR KJER/KTWF/KGNG. WINDS ALOFT
AT 10KFT MSL: W-NW 15-30 KT.
KBOI...VFR TO MVFR CEILINGS THIS EVENING. FOOTHILLS OBSCURED. A
30% CHANCE OF IFR/LIFR DEVELOPING IN FOG OR LOW CIGS THIS
MORNING. VFR THIS AFTERNOON AND EVENING. SNOW SHOWERS MOVE IN
FROM THE WEST AROUND WED/12Z. SURFACE WINDS:VARIABLE 3-5 KT,
BECOMING NW 4-7 KT TUE AFTERNOON. SE 5-8 KT LATE TUE EVENING AND
WED MORNING.
BOI WATCHES/WARNINGS/ADVISORIES
ID...DENSE FOG ADVISORY UNTIL 9 AM MST THIS MORNING IDZ012-033.
OR...DENSE FOG ADVISORY UNTIL 9 AM MST THIS MORNING ORZ064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...JR
LONG TERM....JR
AVIATION.....JR
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