499
FXUS65 KBOI 092326
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
526 PM MDT MON MAR 9 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- COOL AND BREEZY TUESDAY, THEN WARMING TEMPERATURES WITH
MOUNTAIN RAIN AND SNOW STARTING WEDNESDAY.
- GUSTY WINDS THROUGH THE LONG TERM, WITH PRECIPITATION CHANCES
FAVORING THE NORTHERN AREAS EACH DAY.
SHORT TERM /THROUGH WEDNESDAY NIGHT/
ISSUED 248 PM MDT MON MAR 9 2026
TUESDAY IS COOL AND BREEZY AS THE REGION REMAINS UNDER WESTERLY
FLOW AT THE BASE OF A BROAD TROUGH. PASSAGE OF A MINOR UPPER
WAVE ON TUESDAY WILL ENHANCE SHOWER DEVELOPMENT ACROSS THE
MOUNTAINS OF E-CENTRAL OREGON AND W-CENTRAL IDAHO. BY AFTERNOON,
WE'RE CARRYING A 40-60% CHANCE OF SNOW SHOWERS IN THESE ZONES,
WHICH COULD BRING QUICK ACCUMULATIONS OF UP TO 2 INCHES. THE
SHOWERS WILL HAVE A SMALL FOOTPRINT SO THE HEAVIER ACCUMULATIONS
WILL BE LOCALIZED. SOUTHEAST OREGON AND THE BOISE MTNS (SOUTH
OF BANKS-LOWMAN HWY/HWY 21) TO THE ID/NV BORDER WILL REMAIN DRY,
BUT BREEZY. SIMILAR TO TODAY, WIND GUSTS OF 20 TO 40 MPH ARE
POSSIBLE ACROSS OPEN AND ELEVATED TERRAIN.
WEDNESDAY STARTS OFF DRY AND COLD WITH SUB-FREEZING TEMPERATURES
ACROSS THE REGION. A SURGE OF MOISTURE INTO THE PAC NW WILL
INCREASE THE CHANCE OF RAIN AND SNOW OVER BAKER COUNTY AND THE
WEST CENTRAL IDAHO MOUNTAINS INTO WEDNESDAY NIGHT. SNOW LEVELS
BETWEEN 4-6KFT MSL WILL ALLOW FOR MINOR ACCUMULATIONS DOWN TO
MTN VALLEY FLOORS. THIS INCLUDES THE LONG VALLEY FROM CASCADE
TO MCCALL AND OTHER INTERIOR VALLEYS IN THE W-CENTRAL AND
NORTHERN BOISE MTNS. ABOVE 6KFT MSL, ACCUMULATIONS OF 3-6 INCHES
ARE EXPECTED ACROSS INTERIOR MOUNTAINS (NORTHEAST OF
FEATHERVILLE- SMITHS FERRY) THROUGH WEDNESDAY NIGHT. SOUTHEAST
OREGON AND PORTIONS OF SOUTHWEST IDAHO FROM THE SNAKE PLAIN TO
ID/NV BORDER WILL REMAIN DRY. WINDS ARE LIGHTER ON WEDNESDAY
THOUGH STILL BREEZY ACROSS SE OREGON. HIGH TEMPERATURES WILL
WARM 5-15 DEGREES FROM TUESDAY TO WEDNESDAY PUTTING THEM BACK
AROUND NORMAL.
LONG TERM /THURSDAY THROUGH MONDAY/
ISSUED 248 PM MDT MON MAR 9 2026
PERSISTENT UPPER-LEVEL RIDGING ALOFT OVER THE EASTERN PACIFIC AND
UPPER-LEVEL TROUGHING OVER THE WESTERN CANADIAN PROVINCES WILL
PLACE THE REGION IN NORTHWESTERLY/ZONAL FLOW ALOFT. ENHANCED
FLOW ALOFT, DRIVEN BY A STRONG PRESSURE GRADIENT, WILL INCREASE
WINDS AND WIND GUSTS AT THE SURFACE THROUGH THE LONG TERM.
COMBINED EFFECTS FROM DAYTIME HEATING AND THE ENHANCED PRESSURE
GRADIENT WILL CREATE DAILY AFTERNOON WIND GUSTS 25-35 MPH. THE
STRONGEST GUSTS ARE EXPECTED THURSDAY AND SATURDAY, WITH LOCAL
ENHANCEMENTS OF GUSTS TO 40-50 MPH (30-60% CHANCE) IN HIGHER
TERRAIN AND THE CAMAS PRAIRIE. INITIALLY, PRECIPITATION CHANCES
WILL REMAIN FOCUSED ACROSS THE NORTHERN ZONES THURSDAY AND
FRIDAY, WITH PROMINENT UPSLOPE IMPACTING THE WEST-CENTRAL IDAHO
TERRAIN. THEN, THE UPPER FLOW WILL GRADUALLY TRANSITION TO BE
MORE NORTHWESTERLY ON SATURDAY AS THE RIDGE AMPLIFIES ALONG THE
WEST COAST, BROADENING THE PRECIP CHANCES ACROSS THE REMAINDER
OF SOUTHWEST IDAHO AND PORTIONS OF EAST-CENTRAL OREGON. SNOW
LEVELS WILL RANGE BETWEEN 6000-7500 FEET MSL, BUT COULD BRIEFLY
DIP LOWER ON SATURDAY/SUNDAY ACROSS THE NORTHERN ZONES AS COLD
AIR BRIEFLY INTRUDES INTO THE REGION.
TEMPERATURES SHOULD REMAIN 5-15 DEGREES ABOVE NORMAL THROUGHOUT
THIS PERIOD. THEREAFTER, THE UPPER-LEVEL RIDGE WILL CONTINUE TO
BUILD INTO THE WESTERN U.S. SUNDAY/MONDAY, SHIFTING THE STORM
TRACK NORTH AND DECREASING PRECIPITATION CHANCES FOR THE
SOUTHERN AREAS. DESPITE THE SHIFT, SURFACE WINDS WILL REMAIN
BREEZY FOR BOTH SUNDAY AND MONDAY, AND TEMPERATURES WILL STAY
ABOVE NORMAL.
AVIATION /00Z TUESDAY THROUGH WEDNESDAY/
ISSUED 459 PM MDT MON MAR 9 2026
VFR AND INCREASING HIGH CLOUDS THRU THE REST OF TODAY.
VIRGA/LIGHT SNOW SHOWERS MOVE INTO THE KBKE-KMYL AREA TOMORROW
MORNING, LASTING THROUGH TOMORROW EVENING. SURFACE WINDS: W-NW
5-15 KT, GUSTS OF 20-30 KT CONTINUE THROUGH THIS EVENING BEFORE
CALMING OVERNIGHT. TOMORROW AFTERNOON, GUSTS PICK UP AGAIN TO
20-30 KT. WINDS ALOFT AT 10KFT MSL: W 20-40 KT.
KBOI...VFR. SURFACE WINDS: NW 10-18 KT WITH GUSTS 20-30 KT, BECOMING
W-NW 4-9 KT AFTER SUNSET. GUSTS RETURN TOMORROW AFTERNOON AT
5-15 KT SUSTAINED AND 20-25 KT GUSTS.
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.....JM
SHORT TERM...DG
LONG TERM....CH
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