103
FXUS65 KBOI 210003
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
603 PM MDT FRI MAR 20 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- A COLD FRONTAL PASSAGE SATURDAY WILL BRING COOLER TEMPERATURES,
MOUNTAIN SHOWERS, AND GUSTY W-NW WINDS THROUGH THE EVENING.
- RECORD WARMTH RETURNING MID NEXT WEEK.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 220 PM MDT FRI MAR 20 2026
THE UNSEASONABLY STRONG UPPER LEVEL RIDGE THAT HAS BROUGHT
RECORD BREAKING HEAT TO THE REGION WILL BEGIN TO BREAK DOWN
TONIGHT. WE REMAIN ON TRACK TO TIE OR BREAK THE ALL-TIME MARCH
RECORD HIGH TEMPERATURE FOR BOISE OF 82 DEGREES SET ON MARCH 26,
1877. WHILE TONIGHT WILL REMAIN MILD, THE APPROACH OF A COLD
FRONT FROM THE PACIFIC NORTHWEST WILL LEAD TO AN INCREASE IN MID
AND HIGH LEVEL CLOUD COVER, PARTICULARLY ACROSS SOUTHEAST
OREGON AND CENTRAL IDAHO.
ON SATURDAY, THE COLD FRONT WILL SWEEP ACROSS SOUTHEAST OREGON
AND SOUTHWEST IDAHO. THIS WILL BRING A SIGNIFICANT CHANGE IN THE
WEATHER PATTERN, WITH TEMPERATURES DROPPING 10 TO 20 DEGREES
COMPARED TO FRIDAY. BREEZY WEST TO NORTHWEST WINDS WILL DEVELOP
BEHIND THE FRONT SATURDAY AFTERNOON, WITH GUSTS OF 20 TO 35 MPH
POSSIBLE. WHILE THE MOISTURE ASSOCIATED WITH THIS SYSTEM IS
LIMITED, THERE IS A CHANCE (20%) FOR SHOWERS OVER THE MOUNTAINS
OF BAKER COUNTY AND WEST CENTRAL IDAHO. SNOW LEVELS WILL BE
BETWEEN 6000-7000 FEET MSL.
BY SUNDAY, DRY NORTHWEST FLOW ALOFT WILL SETTLE OVER THE AREA.
THIS WILL RESULT IN A COOL BUT PLEASANT DAY WITH PLENTY OF
SUNSHINE. TEMPERATURES ON SUNDAY WILL BE MUCH CLOSER TO SEASONAL
NORMALS. WINDS WILL BE LIGHTER THAN SATURDAY, THOUGH TYPICAL
AFTERNOON GUSTS OF 15 TO 25 MPH CAN STILL BE EXPECTED. CLEAR AND
COOL CONDITIONS WILL PERSIST THROUGH SUNDAY NIGHT AS THE REGION
REMAINS BETWEEN WEATHER SYSTEMS.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 220 PM MDT FRI MAR 20 2026
DRY CONDITIONS WILL PREVAIL TO START THE WORK WEEK, WITH
WARMING TEMPERATURES AS HEIGHTS RISE AHEAD OF THE NEXT SYSTEM.
TEMPERATURES ON MONDAY WILL BE 10-20 DEGREES ABOVE NORMAL, THEN
CHALLENGING RECORD HIGHS COME TUESDAY. CONFIDENCE CONTINUES TO
INCREASE ON A COLD FRONT IMPACTING OUR AREA MID-WEEK NEXT WEEK,
WITH A TROUGH OUT OF BRITISH COLUMBIA DIGGING ACROSS THE PACIFIC
NORTHWEST. HOWEVER, UNCERTAINTY STILL REMAINS ON THE EXACT
TIMING OF THE FRONT. A WEDNESDAY ARRIVAL WOULD DROP TEMPERATURES
CLOSER TO NORMAL WEDNESDAY, WHEREAS A THURSDAY ARRIVAL WOULD
ALLOW FOR AN EXTRA DAY OF ABOVE NORMAL TEMPERATURES BEFORE
DROPPING NEAR NORMAL THURSDAY. EITHER WAY, TEMPERATURES BEHIND
THE COLD FRONT WILL BE NEAR NORMAL FOR THE TIME OF YEAR. THE
BEST CHANCE OF PRECIPITATION (20-40%) ASSOCIATED WITH THIS
SYSTEM WILL COME WEDNESDAY, MAINLY ACROSS HIGHER TERRAIN.
THURSDAY WILL FEATURE SEASONABLE TEMPERATURES WITH PRECIPITATION
TAPERING OFF. BEYOND THURSDAY, ENSEMBLES GENERALLY FAVOR
RIDGING BUILDING BACK IN ACROSS THE AREA. THIS SUPPORTS WARMING
TEMPERATURES AND DRY CONDITIONS THROUGH THE WEEKEND.
AVIATION /00Z SATURDAY THROUGH SUNDAY/
ISSUED 559 PM MDT FRI MAR 20 2026
VFR TONIGHT. A COLD FRONT WILL MOVE NW-SE SATURDAY AM, BRINGING
ISOLATED RAIN SHOWERS WITH BRIEF MVFR NEAR KBKE/KMYL. MTN
OBSCURATION IN SHOWERS. SURFACE WINDS: VARIABLE UP TO 12 KT.
THEN, W-NW 5-15 KT WITH GUSTS TO 15-25 KT SATURDAY AM,
INCREASING TO 10-20 KT WITH GUSTS 20-30 KT SATURDAY PM. WINDS
ALOFT AT 10 KFT MSL: W-SW 20-40 KT.
KBOI...VFR. SURFACE WINDS: VARIABLE OR SE LESS THAN 10 KT.
BECOMING W-NW 8-16 KT AFTER SAT/15Z WITH COLD FRONT. AFTERNOON
GUSTS AROUND 25 KT.
WEEKEND OUTLOOK...BECOMING VFR SATURDAY NIGHT AND SUNDAY.
SURFACE WINDS BECOMING SW-NW 5-15 KT WITH AFTERNOON GUSTS 15-25
KT ON 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.....SH
SHORT TERM...JDS
LONG TERM....NF
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page