576
FXUS65 KBOI 220641
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1241 AM MDT WED APR 22 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- A STRONG COLD FRONT ARRIVES THIS EVENING WITH GUSTS TO 50
MPH, INCREASING SHOWERS, AND ISOLATED THUNDERSTORMS.
- MUCH COOLER ON WEDNESDAY WITH WIDESPREAD PRECIPITATION,
ISOLATED THUNDERSTORMS, GUSTY WINDS, AND SNOW LEVELS LOWERING
TO 4500 TO 5500 FEET.
- PRECIPITATION TOTALS OF 1 TO 2 INCH IN THE MOUNTAINS, 0.25 TO
1.0 INCH IN THE VALLEYS.
- SNOW ACCUMULATIONS OF 10 TO 20 INCHES ON THE PEAKS ABOVE 6000
FEET ESPECIALLY ON THE NORTHWEST FACING PEAKS.
SHORT TERM /THROUGH THURSDAY NIGHT/
ISSUED 242 PM MDT TUE APR 21 2026
A STRONG COLD FRONT MOVES THROUGH EASTERN OR THIS AFTERNOON AND
SOUTHWEST IDAHO THIS EVENING. SNOW LEVELS FALL TO AROUND
4000-5000 FEET BEHIND THE FRONT ON WEDNESDAY. SHOWERS AND
THUNDERSTORMS FORM IN THE LATE AFTERNOON IN EASTERN OR AND
SWEEPS EASTWARD ACROSS THE AREA BY TUESDAY EVENING. WIND GUSTS
UP TO 50 MPH POSSIBLE ALONG THE COLD FRONT THIS AFTERNOON IN
EASTERN OR AND THIS EVENING IN SOUTHWEST ID. THE SYSTEM MOVES
OVERHEAD ON WEDNESDAY, PRECIPITATION BECOMES WIDESPREAD FOR MUCH
OF THE DAY, AND BRINGS 10 TO 20 INCHES OF NEW SNOW ON THE PEAKS
ABOVE 6000 FEET. TOTAL LIQUID EQUIVALENT PRECIPITATION OF 1 TO
2 INCH POSSIBLE OVER THE MOUNTAINS WITH 0.5 TO 1.0 INCH IN THE
VALLEYS. PRECIPITATION TAPERS OFF LATE ON WEDNESDAY AFTERNOON
ACROSS SE OREGON, AND CONTINUES OVER THE CENTRAL ID MOUNTAINS
INTO THURSDAY MORNING. CONDITIONS DRY OUT ON THURSDAY AFTERNOON
WITH COOL AND BREEZY CONDITIONS.
LONG TERM /FRIDAY THROUGH TUESDAY/
ISSUED 242 PM MDT TUE APR 21 2026
A SHORTWAVE TROUGH WILL BRING ANOTHER PUSH OF PRECIPITATION OVER
HIGHER TERRAIN LATE FRIDAY INTO SATURDAY, WITH TEMPERATURES
SLIGHTLY BELOW NORMAL THROUGH THE WEEKEND. A RIDGE OF HIGH
PRESSURE WILL BUILD OVER THE EASTERN PACIFIC, KEEPING US IN COOL
NORTHWESTERLY FLOW THROUGH EARLY NEXT WEEK. THERE IS SOME
SIGNIFICANT MODEL DISAGREEMENT IN THE EVOLUTION OF ANOTHER
CLOSED LOW PRESSURE SYSTEM OFF THE OREGON COAST, WHICH WILL KEEP
PRECIPITATION CHANCES OVER HIGH TERRAIN NEAR THE NEVADA BORDER
AND OVER THE WEST CENTRAL AND BOISE MOUNTAINS IN THE 20-40%
RANGE SUNDAY THROUGH TUESDAY. THE RIDGE OF HIGH PRESSURE WILL
THEN MOVE ONSHORE LATE TUESDAY, BRINGING A SLIGHT WARMING TREND
THROUGH THE END OF THE WEEK.
AVIATION /06Z WEDNESDAY THROUGH THURSDAY/
ISSUED 1240 AM MDT TUE APR 21 2026
NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS. LOW VFR-IFR IN
RAIN, IFR-LIFR IN MTN SNOW. MTNS OBSCURED. SNOW LEVELS:
4500-6000FT MSL. SURFACE WINDS: SW-NW 10-25 KT WITH GUSTS TO
20-35 KT. GUSTS DECREASING EARLY THIS MORNING BEFORE RETURNING
LATE AM. WINDS ALOFT AT 10KFT MSL: W-NW 20-40 KT.
KBOI...RAIN SHOWERS CONTINUING TODAY, WITH PERIODS OF MVFR
CONDITIONS THROUGHOUT THE MORNING HOURS. SHOWERS ENDING AROUND
THU/07Z. SURFACE WINDS: W-N 8-18 KT. GUSTS TO 25-30 KT
RETURNING LATE MORNING THROUGH 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.....SH
SHORT TERM...KA
LONG TERM....SA
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