510
FXUS65 KBOI 202342
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
542 PM MDT MON APR 20 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DRY, WARM AND BREEZY THROUGH TUESDAY AFTERNOON.
- SHOWERS AND THUNDERSTORMS, WINDY, AND MUCH COOLER WEDNESDAY
AND THURSDAY AS A COOL UPPER LEVEL TROUGH MOVES THROUGH.
- SNOW LEVELS LOWER TO 4500 TO 5500 FEET WEDNESDAY AND THURSDAY.
- PRECIPITATION OF UP TO AN 1 TO 1.25 INCH IN THE MOUNTAINS, 0.5
TO 1.0 IN THE VALLEYS.
SHORT TERM /THROUGH WEDNESDAY NIGHT/
ISSUED 250 PM MDT MON APR 20 2026
DRY AND MILD TODAY WITH INCREASING WINDS AS A STRONG COLD FRONT
APPROACHES THE AREA. ONE MORE WARM DAY EXPECTED ON TUESDAY AHEAD
OF THE FRONT. A STRONG COLD FRONT MOVES THROUGH LATE TUESDAY
NIGHT AND SNOW LEVELS FALL TO AROUND 4000-5000 FEET BEHIND THE
FRONT. SHOWERS AND THUNDERSTORMS FORM IN THE LATE AFTERNOON IN
EASTERN OR AND SWEEPS EASTWARD ACROSS THE AREA BY TUESDAY
EVENING. WIND GUSTS UP TO 45 MPH POSSIBLE ALONG THE COLD FRONT.
THE SYSTEM MOVES OVERHEAD ON WEDNESDAY, PRECIPITATION BECOMES
WIDESPREAD FOR MUCH OF THE MORNING, AND BRINGS 6 TO 10 INCHES OF
NEW SNOW ON THE PEAKS ABOVE 6000 FEET. TOTAL LIQUID EQUIVALENT
PRECIPITATION OF 1 TO 1.25 INCH POSSIBLE OVER THE MOUNTAINS WITH
0.5 TO 1.0 INCH IN THE VALLEYS. PRECIPITATION BECOMES SHOWERY
IN NATURE ON WEDNESDAY AFTERNOON, AND CONTINUES OVER THE CENTRAL
ID MOUNTAINS INTO THURSDAY MORNING.
LONG TERM /THURSDAY THROUGH MONDAY/
ISSUED 250 PM MDT MON APR 20 2026
AS THE UPPER-LEVEL TROUGH MOVES FURTHER EAST THURSDAY, THE AREA
WILL BE PLUNGED INTO COOL NORTHERLY FLOW THROUGH THE WEEKEND.
TROUGHING WILL BE IN PLACE OVER MUCH OF THE NORTHERN AND
NORTHWEST U.S. AS A CANADIAN TROUGH BECOMES STATIONARY THROUGH
MONDAY. BREEZY CONDITIONS AND SCATTERED SHOWERS WILL LINGER
THROUGH THURSDAY, THEREON HAVING PRECIPITATION PRIMARILY LIMITED
TO HIGHER ELEVATIONS AT 10-30% FRIDAY-SUNDAY. BELOW-NORMAL
TEMPERATURES WILL CONTINUE, WITH SNOW LEVELS HOLDING BETWEEN
4500-6000 FT MSL. BY MONDAY, THE CANADIAN TROUGH WILL EVENTUALLY
SHIFT EAST, HOWEVER MODEL SOLUTIONS ARE STILL SPLIT ON THE
OVERALL SYNOPTIC PATTERN.
AVIATION /00Z TUESDAY THROUGH WEDNESDAY/
ISSUED 524 PM MDT MON APR 20 2026
VFR UNDER MOSTLY CLEAR SKIES THROUGH MIDDAY TUESDAY. SHOWERS AND
THUNDERSTORMS DEVELOP LATE TUESDAY AFTERNOON, INCREASING IN
COVERAGE THROUGH THE EVENING. WIDESPREAD PRECIPITATION WILL
CONTINUE OVERNIGHT INTO WEDNESDAY WITH SNOW LEVELS DROPPING TO
4-5KFT MSL BY WEDNESDAY MORNING. LOW-VFR/MVFR CEILINGS IN
VALLEYS AND SNOW/IFR IN MTNS OBSCURING TERRAIN ON WEDNESDAY.
SURFACE WINDS: SW-SE 5-15 KT. GUSTS TO 25 KT THROUGH EARLY
EVENING, RAMPING UP 20-30 KT AFTER 18Z WED. WINDS ALOFT AT
10KFT MSL: S-SW 10-30 KT.
KBOI...VFR. LIGHT SURFACE WINDS THROUGH ~18Z TUESDAY. GUSTY
CROSSWINDS POSSIBLE TUESDAY AFTERNOON WITH CUMULUS DEVELOPMENT
AND INCREASING CHANCE OF SHOWERS AFTER TUE/22Z. A 20% CHANCE OF
THUNDERSTORMS AFTER WED/00Z WITH GUSTY OUTFLOW WINDS POSSIBLE.
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.....DG
SHORT TERM...KA
LONG TERM....CH
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