288
FXUS65 KBOI 041152
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
552 AM MDT SAT APR 4 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- HIGH PRESSURE WILL BRING ABOVE NORMAL TEMPERATURES AND DRY
CONDITIONS THROUGH THE WEEKEND AND INTO EARLY NEXT WEEK.
- COOLER TEMPERATURES AND CHANCES FOR PRECIPITATION RETURN BY
THE MIDDLE OF NEXT WEEK.
SHORT TERM /THROUGH MONDAY NIGHT/
ISSUED 328 AM MDT SAT APR 4 2026
HIGH PRESSURE WILL BUILD OVER THE AREA THROUGH THE PERIOD,
BRINGING WARMER AND DRY CONDITIONS. HIGHS TODAY WILL WARM AROUND
10 DEGREES FROM YESTERDAY, PUSHING TEMPERATURES TO AROUND 5
DEGREES ABOVE NORMAL. ASIDE FROM PATCHY FOG EARLY THIS MORNING
IN MOUNTAIN VALLEYS, SKIES WILL BE MOSTLY CLEAR. WINDS WILL BE
LIGHT TODAY. ON SUNDAY, HIGHS WILL CLIMB ANOTHER 4-8 DEGREES AS
THE RIDGE AXIS MOVES OVERHEAD, WITH LOWER VALLEYS REACHING THE
LOWER 70S. HIGH CLOUDS WILL INCREASE AHEAD OF A WEAK TROUGH,
AND A LIGHT EAST TO SOUTHEAST BREEZE WILL DEVELOP ACROSS THE
AREA. THE WARMEST DAY IS EXPECTED TO BE MONDAY, WITH HIGHS
INCREASING BY ANOTHER 2-4 DEGREES AS THE RIDGE BEGINS TO
FLATTEN. A WEAK SYSTEM WILL BRING A MINIMAL (10-20%) CHANCE OF
SHOWERS TO NORTHERN AREAS LATE MONDAY WITH DRY CONDITIONS
ELSEWHERE.
LONG TERM /TUESDAY THROUGH SATURDAY/
ISSUED 328 AM MDT SAT APR 4 2026
A RETURN TO COOLER, MORE ACTIVE CONDITIONS WILL TAKE PLACE
DURING THE EXTENDED. TEMPERATURES TUESDAY WILL REMAIN MILD
BEFORE A TROUGH TO OUR NORTH BRINGS AROUND 10 DEGREES OF COOLING
ON WEDNESDAY. STRONG WESTERLY FLOW ALOFT WILL BRING BREEZY TO
GUSTY WINDS ON TUESDAY, ESPECIALLY ACROSS THE HIGHER TERRAIN AND
SOUTHWEST OF THE SNAKE BASIN WHERE GUSTS 30-45 MPH ARE
EXPECTED. PRECIPITATION CHANCES WILL INCREASE TUESDAY NIGHT AS
THE TROUGH APPROACHES, REACHING 30-50% ACROSS THE AREA ON
WEDNESDAY. WEAK INSTABILITY WILL SUPPORT A 10-20% CHANCE OF
THUNDERSTORMS NEAR THE NEVADA BORDER. COOLER AIR WILL ALSO LOWER
SNOW LEVELS TO AROUND 4500-7000 FEET MSL ON WEDNESDAY.
THERE IS UNCERTAINTY WITH HOW THE AFOREMENTIONED TROUGH WILL
PHASE WITH A CLOSED LOW LOCATED OFF THE CALIFORNIA COAST. THIS
INTERACTION ESPECIALLY AFFECTS THE THURSDAY THROUGH SATURDAY
TIME PERIOD. A MAJORITY OF ENSEMBLES DEPICT A SLOWER INLAND
PROGRESSION OF THE CLOSED LOW, RESULTING IN LESS TROUGHING
(DRIER AND WARMER) OVER OUR AREA DURING THIS TIME. HOWEVER, A
MINORITY OF ENSEMBLES INDICATE A FASTER INLAND PROGRESSION OF
THE CLOSED LOW, ALLOWING THE TROUGH OVERHEAD TO DEEPEN AND SLOW
ITS EASTWARD PROGRESS. THIS WOULD BRING COOLER TEMPERATURES WITH
A HIGHER POTENTIAL FOR PRECIPITATION. FOR NOW, TEMPERATURES AND
SNOW LEVELS ARE FORECAST TO HOLD NEARLY STEADY FROM WEDNESDAY.
THERE WILL BE A 10-30% CHANCE OF SHOWERS EACH DAY, EXCEPT A
30-50% CHANCE ALONG OUR SOUTHERN AND EASTERN BORDERS ON
THURSDAY.
AVIATION /12Z SATURDAY THROUGH SUNDAY/
ISSUED 541 AM MDT SAT APR 4 2026
MAINLY VFR UNDER CLEAR SKIES. PATCHY MOUNTAIN VALLEY FOG THIS
MORNING, INCLUDING NEAR KMYL. SURFACE WINDS: VARIABLE LESS THAN
10 KT. WINDS ALOFT AT 10KFT MSL: NW 5-10 KT, BECOMING VARIABLE
LESS THAN 10 KT BY SUN/00Z.
KBOI...VFR. SURFACE WINDS SE 4-8 KT THIS MORNING, NW THIS
AFTERNOON, BECOMING SE AGAIN THIS EVENING.
SUNDAY OUTLOOK...VFR, HIGH CLOUDS. SURFACE WINDS E-SE 5-15 KT.
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.....ST
SHORT TERM...ST
LONG TERM....ST
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page