854
FXUS65 KBOI 262355
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
555 PM MDT SUN APR 26 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- AFTERNOON RAIN AND SNOW SHOWERS OVER HIGHER TERRAIN THROUGH
TUESDAY.
- TEMPERATURES BELOW NORMAL THROUGH MONDAY THEN WARM TO ABOVE
NORMAL BY THURSDAY.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 247 PM MDT SUN APR 26 2026
A COOL UPPER LEVEL TROUGH REMAINS OVER THE AREA KEEPING
TEMPERATURES BELOW NORMAL THROUGH THE SHORT TERM. A PAIR OF
SHORTWAVES WILL MOVE THROUGH THE AREA, HELPING TO ENHANCE
SHOWERS ACROSS EASTERN OR AND THUNDERSTORMS OVER THE HIGHER
TERRAIN DURING THE AFTERNOON MONDAY. DRIER AIR MOVES INTO THE
AREA ON TUESDAY WITH HIGH CLOUDS MOVING OVER THE AREA.
TEMPERATURES WILL SLOWLY MODERATE EACH DAY.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 247 PM MDT SUN APR 26 2026
RECENT NUMERICAL MODEL RUNS HAVE THE UPPER-LEVEL TROUGH STICKING
AROUND NOW THROUGH THURSDAY MORNING WITH ANOTHER SUBTLE
SHORTWAVE MOVING THROUGH CENTRAL IDAHO. NORTHERLY FLOW ALOFT
WILL STICK AROUND UNTIL THIS FEATURE MOVES THROUGH THE FLOW.
THIS FEATURE WILL BRING A 20-30% CHANCE OF SHOWERS TO THE
MOUNTAINS, WITH DRY CONDITIONS ELSEWHERE. AN UPPER-LEVEL RIDGE
BUILDS QUICKLY IN BEHIND THIS SHORTWAVE MOVING OUT, WITH WEAK
WEST/SOUTHWESTERLY FLOW ALOFT. TEMPERATURES THROUGH THE PERIOD
WILL STEADILY CLIMB; WITH TEMPERATURES STARTING NEAR NORMAL ON
WEDNESDAY, 5-10 DEGREES ABOVE NORMAL THURSDAY, AND 10-15 DEGREES
ABOVE NORMAL BY FRIDAY. THE RIDGE WILL ALSO BRING DRY
CONDITIONS AND LIGHT WINDS. FORECAST CONFIDENCE DECREASES OVER
THE WEEKEND, AS AN UPPER-LEVEL TROUGH WILL APPROACH THE WEST
COAST, WEAKENING THE RIDGE. ENSEMBLES VARY CONSIDERABLY ON THE
TRACK AND STRENGTH OF THE TROUGH. FOR NOW, TEMPERATURES ARE
FAVORED TO REMAIN 10-15 DEGREES ABOVE NORMAL, BUT COULD TREND
COOLER IF THE TROUGH IS STRONGER AND MOVES OVERHEAD.
PRECIPITATION CHANCES TICK UP OVER THE WEEKEND, REACHING 10-30%
BY SUNDAY WITH A 10-15% CHANCE OF THUNDERSTORMS.
AVIATION /00Z MONDAY THROUGH TUESDAY/
ISSUED 552 PM MDT SUN APR 26 2026
VFR WITH SCT-BKN CUMULUS CLOUDS OVER MOST AREAS THROUGH THE EVENING.
SNOW LEVELS 4500-5500 FT MSL. SCATTERED SHOWERS WILL RETURN OVER
HIGHER TERRAIN MONDAY AFTERNOON, WITH ISOLATED THUNDERSTORMS OVER SE
OR NEAR KBKE AND KONO. SURFACE WINDS: W-NW 10-20 KT WITH GUSTS 20-30
KT THIS EVENING, WITH STRONGEST WINDS EAST OF KBOI. WINDS WILL
BECOME VARIABLE OR SW 5-15 KT TONIGHT AFTER SUNSET. WINDS ALOFT AT
10KFT MSL: W-NW 15-25 KT.
KBOI...VFR. SURFACE WINDS: NW 10-15 KT WITH GUSTS 20-25 KT THIS
EVENING, LOWERING DOWN TO 7-12 KT AFTER SUNSET, THEN LIGHT AND
VARIABLE OVERNIGHT.
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...KA
LONG TERM....CH
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