431
FXUS65 KBOI 271152
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
552 AM MDT FRI MAR 27 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DRY WEATHER WITH WARMING TEMPERATURES THROUGH SUNDAY.
- COOLER MONDAY AND TUESDAY WITH GUSTY WINDS AND AN INCREASED
CHANCE OF SHOWERS AND HIGH MOUNTAIN SNOW.
- GULF OF AK LOW WILL BRING WIDESPREAD PRECIPITATION WEDNESDAY
AND THURSDAY. ACCUMULATING SNOW IS POSSIBLE DOWN TO MOUNTAIN
VALLEY FLOORS WITH HEAVY SNOW POSSIBLE ABOVE 6500 FEET.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 342 AM MDT FRI MAR 27 2026
UPPER RIDGING WILL BRING A RETURN TO ABOVE NORMAL TEMPERATURES
THROUGH THE WEEKEND. TODAY WILL SEE THE BIGGEST JUMP IN
TEMPERATURES (8-15 DEGREES) AIDED BY EASTERLY SURFACE WINDS. A
WEAK IMPULSE TRACKING ACROSS CENTRAL NV WILL INCREASE HIGH CLOUD
COVER ON SATURDAY WHILE TEMPERATURES WARM ANOTHER 3-8 DEGREES
FROM TODAY. SUNDAY BRINGS LITTLE CHANGE WITH A MIX OF SUN/CLOUDS
AND TEMPERATURES STEADY AT AROUND 15 DEGREES ABOVE NORMAL. AN
APPROACHING UPPER TROUGH WILL INTRODUCE A SLIGHT CHANCE OF
SHOWERS ACROSS THE E-CENTRAL OREGON AND W-CENTRAL IDAHO MTNS
NORTH OF BAKER CITY-MCCALL-YELLOWPINE SUNDAY NIGHT.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 342 AM MDT FRI MAR 27 2026
THE SHORTWAVE TROUGH AND ACCOMPANYING COLD FRONT CROSS THE
REGION ON MONDAY, BRINGING A >60% CHANCE OF PRECIPITATION TO THE
MTNS. AT LOWER ELEVATIONS THE FOCUS OF PRECIPITATION DEVELOPMENT
IS ALONG THE COLD FRONT AND IS CURRENTLY COVERED BY A 30-50%
CHANCE OF SHOWERS. TUESDAY REMAINS UNSETTLED AS A WEAK TRAILING
TROUGH TRACKS THROUGH CA AND INTO NV. OVERNIGHT DETERMINISTIC
MODELS HAVE BACKED OFF THE PRECIPITATION THREAT FOR OUR AREA,
ESPECIALLY ACROSS NORTHERN ZONES, BUT ENOUGH ENSEMBLE MEMBERS
ARE CARRYING PRECIPITATION TO KEEP A BROAD 30-60% CHANCE OF
RAIN AND HIGH MOUNTAIN SNOW FOR TUE/TUE NIGHT. OF ALL THE
PERIODS IN THE EXTENDED TUE/TUE NIGHT IS THE MOST UNCERTAIN.
MODELS REMAIN IN GOOD AGREEMENT THAT A GOAK LOW WILL KICK
THROUGH THE PAC NW DURING THE WED-FRI TIME PERIOD. THE CHANCE
FOR RAIN/SNOW IS FORECAST TO RAMP UP WED/WED NIGHT AS THE
LEADING EDGE OF THE UPPER TROUGH AND A RIBBON OF DEEPER MOISTURE
CROSSES THE REGION. SNOW LEVELS OF 5500-7000 FEET ON WEDNESDAY
WILL DROP TO 3500-4500 FEET BY THURSDAY AS PRECIPITATION
TRANSITIONS TO MOSTLY INSTABILITY DRIVEN SHOWERS. SITES ABOVE
6500 FEET MSL HAVE THE CHANCE TO SEE A HEAVY WET SNOWFALL WITH
THIS EVENT, WHILE MOUNTAIN VALLEYS COULD SEE LIGHT
ACCUMULATIONS THROUGH THURSDAY. AT LOWER ELEVATIONS THE COLD
AIR ALOFT WILL INTRODUCE THE CHANCE FOR GRAUPEL SHOWERS.
TEMPERATURES ARE AT OR ABOVE NORMAL THROUGH WEDNESDAY, DROPPING
TO AROUND 5 DEGREES BELOW NORMAL FOR THUR/FRI.
AVIATION /12Z FRIDAY THROUGH SATURDAY/
ISSUED 548 AM MDT FRI MAR 27 2026
VFR WITH SCATTERED HIGH CLOUDS TODAY, INCREASING IN COVERAGE BY
AFTERNOON. SURFACE WINDS: E-SE 5-15 KT, WITH AFTERNOON GUSTS 20-25
KT MAINLY OVER SE OR AND KMUO-KJER-KTWF. WINDS ALOFT AT 10KFT MSL:
VARIABLE OR SW LESS THAN 10 KT.
KBOI...VFR. SURFACE WINDS WILL BE SE 6-10 KT WITH GUSTS TO 18
KT THROUGH THE EVENING.
WEEKEND OUTLOOK...VFR THROUGH SUNDAY. INCREASING MID-HIGH CLOUDS
SATURDAY, THEN BROKEN-OVERCAST HIGH CLOUDS SUNDAY. BREEZY W-NW WIND
GUSTS UP TO 15-20 KT EACH AFTERNOON, OTHERWISE VARIABLE SURFACE
WINDS LESS THAN 12 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
AVIATION.....JY
SHORT TERM...DG
LONG TERM....DG
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