298
FXUS65 KBOI 232357
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
557 PM MDT THU APR 23 2026
UPDATE
UPDATED AVIATION DISCUSSION AND KEY MESSAGES.
KEY MESSAGES
- LIGHT MOUNTAIN SNOW SHOWERS AND GUSTY WINDS THROUGH FRIDAY.
- PATCHY FROST OVERNIGHT AND FRIDAY MORNING, THEN WIDESPREAD
FROST AND AREAS OF FREEZING TEMPERATURES SATURDAY MORNING.
- REMAINING UNSETTLED THROUGH THE WEEKEND AND INTO NEXT WEEK.
TEMPERATURES WILL GRADUALLY WARM TOWARD NORMAL.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 226 PM MDT THU APR 23 2026
THE REGION WILL REMAIN ON THE BACK SIDE OF A BROAD UPPER TROUGH
OVER THE NORTHERN GREAT PLAINS INTO THE WEEKEND. SHORTWAVE
ENERGY DROPPING OUT OF CANADA WILL KEEP A 20-30% CHANCE OF SNOW
SHOWERS OVER THE W-CENTRAL IDAHO MTNS ON FRIDAY. SNOW LEVELS
WILL BE DOWN TO MTN VALLEY FLOORS, BUT SHOWERS WILL BE LIGHT AND
ANY SNOW ACCUMULATION WILL TOTAL LESS THAN AN INCH. OTHERWISE,
DRY AND BREEZY CONDITIONS ACROSS SE OREGON AND SW IDAHO. WINDS
WILL RAMP UP IN THE AFTERNOON WITH GUSTS PEAKING AROUND 30 MPH
ACROSS THE SNAKE PLAIN SOUTH AND EAST OF BOISE. A CLOSED LOW OFF
THE CA COAST WILL DRAW THE TROUGH FARTHER SOUTH AND WEST ON
SATURDAY. COOLER AIR ALOFT WILL INCREASE INSTABILITY OVER HIGHER
TERRAIN ALONG THE NV BORDER, SUPPORTING A 20-30% CHANCE OF
AFTERNOON SHOWERS. THE ENVIRONMENT WILL BE BORDERLINE FOR
THUNDERSTORM DEVELOPMENT, TOPPING OUT AROUND 10%. LOWER
ELEVATIONS STAY DRY ON SATURDAY, SEEING SLIGHTLY WARMER
TEMPERATURES AND LIGHTER WINDS.
LOWER VALLEYS WILL SEE PATCHY FROST TONIGHT, THEN WIDESPREAD
FROST AND AREAS OF FREEZING TEMPERATURES LATE FRIDAY NIGHT.
FOR TONIGHT THE WIND, CLOUDS AND BORDERLINE TEMPERATURES SHOULD
LIMIT FROST FORMATION AND AS SUCH HAVE HELD OFF ON A PRODUCT,
COVERING THE THREAT WITH PATCHY FROST WORDING IN FORECAST.
FRIDAY NIGHT WILL SEE WIDESPREAD FROST AND AREAS OF FREEZING
TEMPERATURES WITH LOWS 29-34 FROM ONTARIO TO TWIN FALLS/JEROME.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 226 PM MDT THU APR 23 2026
A TROUGH EXTENDING FROM A LOW CENTERED OVER CANADA WILL DIG
INTO THE REGION SUNDAY INTO MONDAY, BRINGING COOL, BELOW NORMAL
TEMPERATURES AND HIGH TERRAIN PRECIPITATION (30-50% CHANCE).
SHOWERS WILL GENERALLY BE LIGHT, WITH MINIMAL SNOW ACCUMULATION
ANTICIPATED. SNOW LEVELS WILL BEGIN AROUND 4500-5500 FEET MSL
ON SUNDAY, RISING TO 5500-6500 FEET ON MONDAY. HIGH PRESSURE
WILL THEN MOVE INTO THE REGION, BRINGING A WARMING TREND THROUGH
THE END OF NEXT WEEK. LINGERING MOUNTAIN SHOWERS ARE POSSIBLE
THROUGH THURSDAY WITH THIS WARMING TREND, BUT FORECAST
CONFIDENCE IS LOW (20-30% CHANCE).
AVIATION /00Z FRIDAY THROUGH SATURDAY/
ISSUED 543 PM MDT THU APR 23 2026
GENERALLY VFR. SCATTERED SHOWERS MAINLY OVER THE W-CNTRL MTNS THIS
EVENING AND FRI/PM. PATCHY FOG/LOW STRATUS EARLY FRI/AM IN SHELTERED
VALLEYS. IFR/LIFR CONDITIONS IN SNOW SHOWERS AND FOG/LOW STRATUS.
SNOW LEVELS: 5-7KFT MSL THIS EVENING. THEN 2.5-5 KFT MSL FRI/AM,
LOWEST OVER THE W-CNTRL MTNS. SURFACE WINDS: W-NW 10-20 KT WITH
GUSTS TO 20-30 KT THIS EVENING. THEN W-N 5-15 KT OVERNIGHT.
WINDS ALOFT AT 10KFT MSL: W-NW 15-30 KT. |
KBOI...VFR. SURFACE WINDS: NW 10-15 KT WITH GUSTS TO 20 KT THIS
AFTERNOON. THEN NW 5-10 KT OVERNIGHT.
WEEKEND OUTLOOK...GENERALLY VFR. UNSTABLE CONDITIONS WILL SUPPORT A
CHANCE OF IFR SNOW/MIXED SHOWERS OVER THE HIGHER TERRAIN SAT/SUN
AFTERNOONS. OCCASIONAL VALLEY RAIN SHOWERS ALSO POSSIBLE. SLIGHT
CHANCE OF THUNDERSTORMS NEAR NV BORDER SAT/SUN. SNOW LEVELS:
LOWEST FRIDAY AT 3-4KFT MSL, RISING TO 4-6KFT MSL FOR SAT/SUN.
MTNS OBSCURED IN SHOWERS. SURFACE WINDS: NW-N 10-20 KT WITH
20-30 KT GUSTS FRIDAY, THEN W-NW 5-15 KT WITH 15-25 KT GUSTS
SAT/SUN.
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...DG
LONG TERM....SA
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