812
FXUS65 KBOI 281740
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1140 AM MDT TUE APR 28 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- AFTERNOON RAIN AND SNOW SHOWERS OVER HIGHER TERRAIN THROUGH
WEDNESDAY.
- GRADUAL WARMING THROUGH THE WEEK.
- THUNDERSTORMS POSSIBLE THIS WEEKEND.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 441 AM MDT TUE APR 28 2026
A COOL UPPER LEVEL TROUGH WILL KEEP UNSETTLED CONDITIONS TODAY
AND TOMORROW AFTERNOON. SHOWERS AND A LOW CHANCE (10%) OF
THUNDER OVER MOUNTAINS WILL BE THE MOST NOTABLE PART OF THE
FAIRLY WEAK SYSTEM. ACCUMULATIONS WILL BE MINIMAL OUT OF STORMS.
TEMPERATURES GRADUALLY CLIMB EACH DAY, UP TO 5 DEGREES ABOVE
NORMAL BY THURSDAY.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 441 AM MDT TUE APR 28 2026
BRIEF RIDGING FRIDAY AS THE WARMING TREND CONTINUES.
TEMPERATURES HOLD STEADY AT 10 DEGREES ABOVE NORMAL SATURDAY
THROUGH THE LONG TERM FORECAST. THE FORECAST GETS A LITTLE MORE
UNCERTAIN BEGINNING THIS WEEKEND. A SHORTWAVE UPSTREAM
AMPLIFIES INTO A CLOSED LOW OFF THE PACIFIC NORTHWEST COAST.
MODELS SHOW THE LOW TRACKING SOUTH ALONG THE COAST ON SATURDAY.
CLOUDS INCREASE, BUT MOST OF THE PRECIPITATION ASSOCIATED AT
THIS STAGE REMAINS WEST AND NORTH OF OUR AREA. CLOSED LOWS ARE
NOTORIOUS FOR THEIR UNPREDICTABILITY BY NWP, SO THERE IS ROOM
FOR PRECIPITATION CHANCES TO RISE ON SATURDAY IF THE PREDICTED
TRACK CHANGES. SUNDAY THROUGH TUESDAY MODEL DEVIATIONS CONTINUE
TO INCREASE. HOWEVER, THE BROAD CONSENSUS IS THAT THE CLOSED LOW
WILL BRING UNSETTLED CONDITIONS, ESPECIALLY IN THE AFTERNOON. A
MAJORITY OF MODELS SHOW AFTERNOON AND EVENING SHOWERS POPPING
UP SATURDAY THROUGH THE LONG TERM. AT PEAK HEATING AND WITH THE
COLDER ATMOSPHERE BROUGHT BY THE LOW, THUNDERSTORM DEVELOPMENT
WILL BE POSSIBLE. CHANCE OF PRECIPITATION RISES FROM 10-20% THIS
WEEKEND TO 20-30% EARLY NEXT WEEK.
AVIATION /18Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1128 AM MDT TUE APR 28 2026
VFR WITH MID-HIGH CLOUDS. SCATTERED MOUNTAIN SHOWERS THIS
AFTERNOON IN CENTRAL IDAHO. SNOW LEVELS 6000-7000 FT MSL.
SURFACE WINDS: W-NW 5-15 KT THIS AFTERNOON WITH GUSTS IN THE
SNAKE PLAIN UP TO 20 KT. OTHERWISE, LIGHT AND VARIABLE. WINDS
ALOFT AT 10KFT MSL: NW 5-15 KT.
KBOI...VFR. SURFACE WINDS: NW 5-15 KT THIS AFTERNOON. BECOMING
SOUTHEAST AROUND 5 KT THIS EVENING INTO EARLY WED MORNING.
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.....JR
SHORT TERM...JM
LONG TERM....JM
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