773
FXUS65 KBOI 071150
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
550 AM MDT TUE APR 7 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- A DRY COLD FRONT WILL BRING BREEZY WINDS TODAY, WITH
TEMPERATURES COOLING AROUND 5 DEGREES BY WEDNESDAY.
- SHOWERS AND THUNDERSTORMS WILL INCREASE LATE IN THE WEEK INTO
THE WEEKEND.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 340 AM MDT TUE APR 7 2026
A SYSTEM MOVING EAST ACROSS SOUTHERN CANADA TODAY WILL PUSH A
WEAK AND DRY COLD FRONT THROUGH OUR AREA. THE MAIN IMPACT FROM
THIS SYSTEM WILL BE BREEZY CONDITIONS AHEAD OF AND ALONG THE
FRONT, WITH GUSTS 20-35 MPH THIS AFTERNOON AND EVENING. WEAK
INSTABILITY ALONG THE IDAHO/NEVADA BORDER WILL SUPPORT A 20%
CHANCE OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON. OTHERWISE,
THE AREA WILL REMAIN DRY TODAY. THE FRONT WILL BRING AROUND 5
DEGREES OF COOLING TODAY ACROSS NORTHERN AREAS. ACROSS SOUTHERN
AREAS, HIGH TEMPERATURES WILL BE SIMILAR TO YESTERDAY WITH LOWER
VALLEYS REACHING THE LOW TO MID 70S, AS COOLER AIR WITH THE
FRONT WILL NOT ARRIVE UNTIL THE EVENING. BY WEDNESDAY, ALL AREAS
WILL BE AROUND 5 DEGREES COOLER. WINDS WILL REMAIN BREEZY
ACROSS SOUTH-CENTRAL IDAHO WITH GUSTS 15-25 MPH, BUT GUSTS
SHOULD BE LOWER ELSEWHERE.
A CLOSED LOW OFF THE COAST OF NORTHERN CALIFORNIA WILL BEGIN TO
ADVECT MOISTURE INTO SOUTH-CENTRAL OREGON ON WEDNESDAY,
BRINGING A 20-40% CHANCE OF SHOWERS AND A LOWER (10-20%) CHANCE
OF THUNDERSTORMS. MOISTURE WILL CONTINUE TO INCREASE ON
THURSDAY, WITH SHOWER AND THUNDERSTORM CHANCES SPREADING ACROSS
MOST OF SOUTHEAST OREGON AND FAR SOUTHERN IDAHO. SOUTHERLY FLOW
AHEAD OF THE LOW WILL ALLOW TEMPERATURES TO QUICKLY REBOUND FROM
WEDNESDAY'S SLIGHT COOLDOWN, WITH HIGH TEMPERATURES THURSDAY
ONLY A DEGREE OR TWO SHY OF HIGHS TODAY.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 340 AM MDT TUE APR 7 2026
MOISTURE WILL INCREASE FURTHER IN THE SOUTHERLY FLOW AHEAD OF
THE SLOWLY ADVANCING CALIFORNIA LOW FRIDAY AND SATURDAY.
PRECIPITABLE WATER VALUES WILL CLIMB TO AROUND THE 90TH
PERCENTILE FOR EARLY APRIL, RESULTING IN PLENTY OF MOISTURE FOR
SHOWER AND THUNDERSTORM DEVELOPMENT. INCREASED MOISTURE AND
DAYTIME INSTABILITY ON FRIDAY WILL SUPPORT A 30-70% CHANCE OF
SHOWERS (HIGHEST NEAR THE NEVADA BORDER) WITH A 15-25% CHANCE OF
THUNDERSTORMS. ON SATURDAY, AN UPPER LEVEL TROUGH FROM THE GULF
OF ALASKA WILL APPROACH THE PACIFIC NORTHWEST. THE ADDITIONAL
LIFT PROVIDED BY THIS SYSTEM WILL ACT ON THE ABUNDANT MOISTURE
IN PLACE TO FURTHER INCREASE SHOWER CHANCES TO 60-80%. THERE
WILL BE ENOUGH INSTABILITY IN THE WARM, MOIST AIRMASS AHEAD OF
THE TROUGH TO SUPPORT THUNDERSTORM DEVELOPMENT AS WELL.
THE TROUGH WILL BEGIN TO MOVE INLAND SUNDAY, KEEPING SHOWER AND
THUNDERSTORM CHANCES ELEVATED. PRECIPITATION CHANCES WILL BEGIN
TO TREND LOWER ON MONDAY AND ESPECIALLY TUESDAY AS THE TROUGH
MOVES EAST OF THE AREA. PRECIPITATION TOTALS LATE THIS WEEK
THROUGH THE WEEKEND SHOULD BE LIGHT TO MODERATE ON AVERAGE,
ALTHOUGH HEAVIER AMOUNTS WILL BE POSSIBLE FROM THUNDERSTORMS.
TEMPERATURES WILL COOL TO CLOSER TO NORMAL SUNDAY THROUGH
TUESDAY AS THE TROUGH MOVES INLAND. SNOW LEVELS WILL BE ABOVE
8KFT MSL THROUGH SATURDAY, THEN FALL TO AROUND 6-7KFT SUNDAY AND
5-6KFT BY MONDAY AND TUESDAY. WINDS WILL BE BREEZY UNDER THIS
PATTERN, ESPECIALLY MONDAY AS THE TROUGH EXITS THE AREA.
AVIATION /12Z TUESDAY THROUGH WEDNESDAY/
ISSUED 541 AM MDT TUE APR 7 2026
VFR. ISOLATED SHOWERS/THUNDERSTORMS ALONG ID/NV BORDER AFTER
TUE/21Z, WITH OUTFLOWS UP TO 30 KT. SURFACE WINDS: VARIABLE
AROUND 10 KT OR LESS. THEN NW-W 10-20 KT WITH GUSTS TO 20-30 KT
LATE THIS MORNING THROUGH EARLY EVENING, DECREASING TO 5-15 KT
AFTER SUNSET. WINDS ALOFT AT 10KFT MSL: W 20-30 KT.
KBOI...VFR. SURFACE WINDS: VARIABLE LESS THAN 8 KT THIS MORNING,
BECOMING NW 8-15 KT WITH GUSTS TO 20-25 KT AFTER TUE/17Z,
DECREASING TO 5-10 KT AFTER WED/01Z.
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
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