702
FXUS65 KBOI 311205
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
605 AM MDT TUE MAR 31 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
-VALLEY RAIN AND MOUNTAIN SNOW THROUGH WEDNESDAY. NORTHWEST
WINDS GUST UP TO 30 MPH DURING THE DAY AND ISOLATED AFTERNOON
THUNDERSTORMS ARE POSSIBLE.
-THE MOST IMPACTFUL SYSTEM ARRIVES LATE WEDNESDAY, BRINGING A
STRONG COLD FRONT WITH GUSTY WINDS AND HEAVY MOUNTAIN SNOW INTO
THURSDAY MORNING. GUSTS OF 30-45 MPH POSSIBLE ACROSS EASTERN OR
AHEAD OF THE FRONT. SIGNIFICANT SNOW IS EXPECTED ABOVE 6000
FEET, WITH SNOW-COVERED ROADS ACROSS PORTIONS OF IDAHO HIGHWAY
55, ID HIGHWAY 21 AND US 95 THURSDAY MORNING.
-DRY WEATHER AND ABOVE NORMAL TEMPERATURES RETURN FOR THE
WEEKEND.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 405 AM MDT TUE MAR 31 2026
A STATIONARY FRONT REMAINS OVER THE AREA OVER THE NEXT DAY WITH
SHOWER CHANCES HIGHEST NORTH OF A LINE FROM BURNS TO BOISE. SNOW
LEVELS REMAIN AROUND 6500-7500 FEET TODAY. A TROUGH WILL SLOWLY
MOVE INTO THE REGION, USHERING IN COOLER AIR ALOFT BY
WEDNESDAY. THIS COOLER AIR WILL GENERATE ENOUGH INSTABILITY FOR
SHOWERS AND ISOLATED THUNDERSTORMS DURING THE AFTERNOON EACH
DAY. RELATIVELY DRY LOW LEVELS WILL SUPPORT GUSTY OUTFLOW WINDS
IN THE VICINITY OF SHOWERS. SNOW LEVELS FALL TO 5500-6500 FEET
ON WEDNESDAY.
WINDS WILL RAMP UP AHEAD OF A COLD FRONT WEDNESDAY AFTERNOON,
ESPECIALLY IN EASTERN OR, WITH GUSTS OF 30 TO 45 MPH. HAZY
CONDITIONS FROM LAKE DUST ACROSS SOUTHCENTRAL OR IS POSSIBLE.
A POTENT COLD FRONT WILL MOVE INTO THE AREA EARLY THURSDAY
MORNING, WITH SNOW LEVELS FALLING TO AROUND 2500-3000FT.
MODERATE TO HEAVY SHOWERS WITH A SLIGHT CHANCE OF THUNDERSTORMS
EXPECTED ALONG THE FRONT. LITTLE TO NO SNOW ACCUMULATIONS IN
THE VALLEYS BELOW 4000 FEET, 2 TO 6 INCHES ABOVE 5000 FEET, AND
6 TO 10 INCHES OF SNOW ABOVE 6000 FEET. PRECIPITATION QUICKLY
TAPERS OFF BEHIND THE MAIN FRONT WITH SCATTERED SHOWERS DURING
THE AFTERNOON ON THURSDAY.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 405 AM MDT TUE MAR 31 2026
THE UPPER LOW SYSTEM IS EXPECTED TO STEER EASTWARD OUT OF OUR
AREA AND CONTINUE A WEAK NORTHWEST FLOW THROUGH FRIDAY.
PRECIPITATION CHANCES WILL BEGIN TO TAPER OFF WITH SCATTERED
SNOW SHOWERS CONTINUING OVER HIGHER TERRAIN THROUGH FRIDAY
AFTERNOON. COME SATURDAY, A DRYING AND WARMING TREND WILL SET IN
AS A PACIFIC RIDGE BUILDS INTO THE NORTHWEST REGION. THROUGH
SUNDAY, TEMPERATURES WILL BE UP TO 5-10 DEGREES ABOVE NORMAL. ON
MONDAY, ANOTHER UPPER LOW OFF THE GULF OF ALASKA WILL
POTENTIALLY STEER A SHORTWAVE TROUGH ACROSS THE NORTHERN
PORTIONS OF OUR CWA. CONSIDERABLE GUIDANCE UNCERTAINTY REMAINS
OVER THE TIMING AND MAGNITUDE OF THIS SYSTEM. FOR NOW, A LESS
THAN 20% CHANCE OF PRECIPITATION IS EXPECTED FOR MOUNTAIN AREAS
ON MONDAY AND UP TO 30% ON TUESDAY.
AVIATION /12Z TUESDAY THROUGH WEDNESDAY/
ISSUED 604 AM MDT TUE MAR 31 2026
SHOWERS INCREASING THIS MORNING ACROSS ALL AREAS. LOW VFR OR MVFR
CONDITIONS IN RAIN SHOWERS, WITH MVFR/IFR IN THE MOUNTAINS.
MOUNTAINS OBSCURED. SNOW LEVELS: 4-6KFT MSL ACROSS THE NORTH, 6-7KFT
MSL ACROSS CENTRAL AND SOUTH. ISOLATED THUNDERSTORMS DEVELOPING THIS
AFTERNOON WITH GUSTS UP TO 35 KT AND SMALL HAIL/GRAUPEL POSSIBLE.
SURFACE WINDS: VARIABLE LESS THAN 10 KT THROUGH MORNING, BECOMING SW-
SE 5-15 KT IN THE AFTERNOON, WITH GUSTS 20-30 KT OVER HIGHER TERRAIN
AND SW OF THE SNAKE BASIN. WINDS ALOFT AT 10KFT MSL: SW 20-35 KT.
KBOI...MAINLY VFR. RAIN SHOWERS DEVELOPING THIS MORNING AND
CONTINUING THROUGH AFTERNOON. A 30% CHANCE OF THUNDERSTORMS THIS
AFTERNOON AFTER 21Z WITH GUSTY WINDS UP TO 35 KT AND IFR
CONDITIONS. SURFACE WINDS: SE LESS THAN 10 KT BECOMING SW UNDER
10 KT IN THE AFTERNOON.
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....JY
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