865
FXUS65 KBOI 201745
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1145 AM MDT FRI MAR 20 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- LAST DAY OF RECORD HIGH TEMPERATURES TODAY, WITH MUCH COOLER
TEMPERATURES THIS WEEKEND.
- BREEZY CONDITIONS AND LOW RELATIVE HUMIDITY IN THE SINGLE
DIGITS WILL CREATE FIRE DANGER CONCERNS FOR AREAS NEAR THE NV
BORDER THIS AFTERNOON.
- A COLD FRONTAL PASSAGE TOMORROW AFTERNOON WILL BRING COOLER
TEMPERATURES, MOUNTAIN PRECIPITATION, AND BREEZY WESTERLY
WINDS THROUGH THE EVENING.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 316 AM MDT FRI MAR 20 2026
THE LAST DAY OF RECORD HIGHS WILL OCCUR TODAY AS HIGH PRESSURE
CENTERS OVER THE DESERT SOUTHWEST. A COLD FRONT WILL MOVE
THROUGH EARLY SATURDAY, BRINGING A 10-20 DEGREE TEMPERATURE
DROP, BREEZY WESTERLY WINDS, AND LIGHT MOUNTAIN SHOWERS. SHOWERS
WILL OCCUR OVER THE NORTHERN PORTIONS OF VALLEY/BAKER COUNTY,
WITH ONLY A 5-10% CHANCE OF ANY PRECIPITATION FURTHER SOUTH.
SNOW LEVELS WILL START AROUND 8000 FEET, BRIEFLY DROPPING TO
6000 FEET AS SHOWERS TAPER OFF. THE COOLEST TEMPERATURES ARE
EXPECTED ON SUNDAY, WITH VALLEY HIGHS IN THE UPPER 50S TO LOW
60S.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 316 AM MDT FRI MAR 20 2026
ZONAL FLOW ALOFT ON MONDAY WILL BRING ANOTHER DAY OF NEAR NORMAL
TEMPERATURES, WITH DRY CONDITIONS. A RIDGE OF HIGH PRESSURE WILL
THEN BUILD IN FOR TUESDAY, BRINGING A SHORT LIVED RETURN TO HIGH
TEMPERATURES. VALLEY HIGHS WILL BE IN THE MID 70S, WITH
MOUNTAIN HIGH TEMPS IN THE 50S. A TROUGH OFF THE BRITISH
COLUMBIA COAST WILL THEN DIG INTO THE PACIFIC NORTHWEST,
SHIFTING THE REGION UNDER SOUTHWEST FLOW WITH A COLD FRONTAL
PASSAGE ON WEDNESDAY. THIS WILL BRING COLDER TEMPERATURES AND
INCREASED CHANCES OF PRECIPITATION (30-50%), PRIMARILY OVER
HIGH TERRAIN. PRECIPITATION WILL TAPER OFF ON THURSDAY, WITH
COOLER TEMPERATURES LINGERING UNDER ZONAL FLOW, THEN ANOTHER
RIDGE OF HIGH PRESSURE WILL BUILD OVER THE REGION BY LATE
FRIDAY. THIS WILL LIKELY BRING A RETURN TO WARM AND DRY
CONDITIONS FOR THE WEEKEND.
AVIATION /18Z FRIDAY THROUGH SATURDAY/
ISSUED 1145 AM MDT FRI MAR 20 2026
VFR WITH INCREASING CLOUDS. A COLD FRONT MOVING NW-SE ENTERING
E-OREGON SAT/AM, BRINGING ISOLATED TO SCATTERED SHOWERS AND
ISOLATED MVFR/IFR CONDITIONS. SURFACE WINDS: VARIABLE UP TO 12
KT, EXCEPT S-W GUSTS UP TO 25 KT WEST AND SOUTH OF THE SNAKE
PLAIN THIS AFTERNOON. BECOMING W-NW 5-15 KT WITH GUSTS TO 25 KT
EARLY SAT/AM BEHIND THE FRONT. WINDS ALOFT AT 10 KFT MSL: W-SW
10-30 KT.
KBOI...VFR WITH INCREASING HIGH CLOUDS. SURFACE WINDS: SE 5-10
KT, BECOMING W-NW 8-12 KTS SAT/AM FOLLOWING A COLD FRONT.
WEEKEND OUTLOOK...A COLD FRONT WILL BRING GUSTY WINDS AND
ISOLATED TO SCATTERED RAIN SHOWERS ON SATURDAY. LOCALIZED MVFR-
IFR CONDITIONS IN SHOWERS NEAR KMYL/KBKE. VFR SUNDAY. SURFACE
WINDS: INCREASING TO W-NW 10-20 KT WITH GUSTS TO 20-35 KT WITH
COLD FRONT SATURDAY PM. THEN, SW-NW 5- 15 KT WITH AFTERNOON
GUSTS 15-25 KT SUNDAY.
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.....NF
SHORT TERM...SA
LONG TERM....SA
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