741
FXUS65 KBOI 130024
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
624 PM MDT SUN APR 12 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- ISOLATED AFTERNOON THUNDERSTORMS OVER SOUTHWEST IDAHO TODAY
WITH GUSTY OUTFLOW WINDS.
- WIDESPREAD VALLEY RAIN AND MOUNTAIN SNOW ABOVE 4500 FEET ON
MONDAY.
- MUCH COOLER TEMPERATURES WITH PERIODS OF PRECIPITATION
WEDNESDAY THROUGH FRIDAY.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 204 PM MDT SUN APR 12 2026
AN ACTIVE WEATHER PATTERN CONTINUES AS AN UPPER LEVEL LOW
CONTINUES EASTWARD ACROSS THE GREAT BASIN TONIGHT. INCREASING
LARGE-SCALE ASCENT AND MODEST MID-LEVEL MOISTURE ASSOCIATED WITH
WEAK SHORTWAVE PASSAGE HAVE COMBINED WITH COLD TEMPERATURES
ALOFT AND ASSOCIATED BUOYANCY FOR THUNDERSTORM DEVELOPMENT THIS
AFTERNOON ALONG THE NV/ID BORDER. THESE STORMS WILL SUPPORT THE
THREAT FOR GUSTY OUTFLOW WINDS UP TO 45 MPH AND BRIEF PERIODS OF
HEAVY RAIN CAPABLE OF REDUCING VISIBILITY AS THEY PUSH NORTH-
NORTHEAST ACROSS SOUTH-CENTRAL IDAHO. ONE OR TWO STORMS COULD
PRODUCE WIND GUSTS NEAR SEVERE THRESHOLDS.
AS THE CENTER OF THE LOW PRESSURE SYSTEM MOVES EAST-NORTHEAST
ACROSS THE REGION TONIGHT, WRAPAROUND MOISTURE AND COOLER
NORTHERLY FLOW ALOFT WILL PUSH A SECONDARY BAND OF PRECIPITATION
STARTING ACROSS OUR NORTHERN ZONES EARLY MONDAY MORNING. THIS
BAND SHIFTS SLOWLY SOUTHEAST AS THE LOW PUSHES EASTWARD ON
MONDAY. THIS WILL BRING MUCH LOWER SNOW LEVELS (4500-5500 FEET
MSL) AND WIDESPREAD PRECIPITATION TO THE REGION THROUGH MONDAY
AFTERNOON. MOUNTAIN VALLEYS AROUND 5000 FEET COULD SEE 1-3
INCHES OF WET SNOW, WHILE MOUNTAIN PASSES ON US-95 AND ID-21
COULD SEE UP TO 6 INCHES. HIGH PEAKS OVER 8000 FEET COULD SEE UP
TO 12 INCHES OF SNOW BY MONDAY MORNING. LIQUID TOTALS FROM
SUNDAY AND MONDAY'S PERIODS OF PRECIPITATION WILL REACH 0.50-1.0
INCHES OF RAIN NORTH OF THE TREASURE VALLEY, WITH LOCALLY
HIGHER AMOUNTS OVER HIGH TERRAIN.
BY MONDAY NIGHT, THE LOW IS EXPECTED TO EXIT TOWARD THE
NORTHERN ROCKY MOUNTAINS WITH BREEZY CONDITIONS AND TEMPERATURES
REMAINING WELL BELOW SEASONAL NORMALS. BRIEF RIDGING TUESDAY
WILL PROVIDE A SHORT BREAK BEFORE ANOTHER STRONG ALASKAN LOW
APPROACHES THE REGION. CLOUD COVER WILL INCREASE LATE TUESDAY
WITH PRECIPITATION BEGINNING TO SPREAD INTO THE SOUTHERN
MOUNTAINS BY TUESDAY NIGHT.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 204 PM MDT SUN APR 12 2026
A STRONG LOW MOVES INTO THE AREA ON WEDNESDAY, BRINGING RAIN,
SNOW, AND GUSTY WINDS THROUGH THURSDAY. AHEAD OF THE COLDER
AIRMASS, SNOW LEVELS BEGIN AT 5-6 KFT MSL WEDNESDAY. RAINFALL
DURING THIS TIME WILL TOTAL 0.1-0.4 INCHES IN LOWER ELEVATIONS,
AND 0.3-0.8 INCHES IN HIGHER ELEVATIONS BELOW 6KFT. AS SNOW
LEVELS DROP TO VALLEY FLOORS WEDNESDAY NIGHT AND THURSDAY
MORNING, RAIN TURNS TO MIXED PRECIPITATION AND SNOW. IN LOWER
ELEVATIONS, SNOWFALL WILL BE A DUSTING UP TO AN INCH, IN HIGHER
ELEVATIONS 1-4 INCHES. ABOVE 6KFT, THE STORM TOTAL SNOWFALL WILL
BE 4-12 INCHES, AND UP TO 20 INCHES ALONG RIDGES AND SUMMITS IN
CENTRAL IDAHO. AS THE COLD FRONT ASSOCIATED WITH THE SYSTEM
MOVES THROUGH, TEMPERATURES DROP FROM 5 DEGREES BELOW NORMAL ON
WEDNESDAY, TO 15 DEGREES BELOW NORMAL ON THURSDAY. THIS COOLING
WILL PUT MORNING LOWS NEAR TO JUST BELOW FREEZING IN LOWER
ELEVATIONS THURSDAY THROUGH SATURDAY. PRE AND POST FRONTAL WINDS
WED/THU UP TO 35 MPH ARE POSSIBLE ACROSS THE AREA.
FOLLOWING THIS STRONG ALASKAN LOW; WARMING AND DRYING TREND
WILL SET IN BEYOND THURSDAY AS RIDGING BUILDS IN ACROSS THE
AREA. TEMPERATURES WILL RETURN TO NEAR NORMAL COME SATURDAY,
WARMING EVEN MORE SUNDAY. THE DRY CONDITIONS DON'T APPEAR TO
LAST TOO LONG, AS ANOTHER SYSTEM WILL IMPACT THE AREA COME EARLY
NEXT WEEK.
AVIATION /00Z MONDAY THROUGH TUESDAY/
ISSUED 624 PM MDT SUN APR 12 2026
NUMEROUS SHOWERS PRODUCING LOW VFR TO IFR, CONTINUING THROUGH
MONDAY. PERIODS OF LIFR IN MTN SNOW. SHOWERS CAPABLE OF HEAVY
PRECIP RATES AND 25-30 KT OUTFLOWS. SNOW LEVELS: 4500-5500 FT
MSL THROUGH MONDAY AM. MTNS OBSCURED. SURFACE WINDS: S-W 5-15
KT, GUSTS UP TO 25 KT. WINDS ALOFT AT 10KFT MSL: SW TO W 15-30
KT, TRANSITIONING TO W TO NW OVERNIGHT.
KBOI...LOW VFR AND MVFR IN RAIN SHOWERS. BRIEF RESPITE LATE
THIS EVENING, THEN RAIN RETURNING OVERNIGHT. RAIN RATES MODERATE
TO HEAVY AT TIMES. SHOWERS BECOMING SCATTERED LATE MON AFTERNOON.
SURFACE WINDS: VARIABLE OR SE 5-10 KT, TRANSITIONING TO SW-NW
5-15 KT MID MONDAY 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.....SH
SHORT TERM...JDS
LONG TERM....JM
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