803
FXUS65 KBOI 192339
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
539 PM MDT SUN APR 19 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DRY, BREEZY AFTERNOONS AND WARM THROUGH TUESDAY.
- TEMPERATURES 10 TO 15 DEGREES ABOVE NORMAL THROUGH TUESDAY.
- SHOWERS AND THUNDERSTORMS, WINDY, AND MUCH COOLER WEDNESDAY
AND THURSDAY AS A COOL UPPER LEVEL TROUGH MOVES THROUGH.
SHORT TERM /THROUGH TUESDAY NIGHT/
ISSUED 242 PM MDT SUN APR 19 2026
A RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE AREA
WITH A WARMING TREND THROUGH MONDAY. TEMPERATURES WILL WARM AN
ADDITIONAL 5 DEGREES ON MONDAY AND BE STEADY THROUGH TUESDAY
AHEAD OF THE NEXT COLD FRONT. BREEZY SOUTH TO SOUTHEAST WINDS
EXPECTED DURING THE AFTERNOONS AHEAD OF THE COLD FRONT. THE COLD
FRONT ARRIVES LATE TUESDAY NIGHT INTO EARLY WEDNESDAY MORNING
WITH SHOWERS BECOMING WIDESPREAD. A SLIGHT CHANCE OF
THUNDERSTORMS POSSIBLE ALONG THE COLD FRONT ON TUESDAY EVENING.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
ISSUED 242 PM MDT SUN APR 19 2026
A MOISTURE-RICH (50TH-75TH PERCENTILE PW) 500 MB CLOSED LOW WILL
MOVE OVERHEAD WEDNESDAY. THIS FEATURE WILL BRING THUNDERSTORM
CHANCES (15-20%), WIDESPREAD PRECIPITATION CHANCES (70-90%), AND
GUSTY WINDS (25-40 MPH, HIGHEST IN THE WESTERN MAGIC VALLEY) ON
WEDNESDAY. SNOW LEVELS WEDNESDAY AND THURSDAY WILL RANGE FROM
5000-6500 FT MSL. AS A RESULT, SEVERAL INCHES OF SNOW
ACCUMULATION WILL DEVELOP ACROSS THE HIGHER TERRAIN ONCE GROUND
TEMPS COOL, WHILE MODERATE RAINFALL TOTALS CAN BE ANTICIPATED
FOR LOW/MID ELEVATIONS. NUMEROUS SHOWERS WILL REMAIN THROUGH
THURSDAY AS THE TROUGH MOVES EAST. WINDS WILL GRADUALLY SUBSIDE
FOR THURSDAY, BUT REMAIN BREEZY THROUGHOUT THE AFTERNOON. COOLER
TEMPERATURES ARE ALSO EXPECTED TO PERSIST FROM THE COLD FRONTAL
PASSAGE LATE TUESDAY/EARLY WEDNESDAY. TEMPERATURES ARE EXPECTED
TO BE 10-15 DEGREES BELOW NORMAL WEDNESDAY, 5-10 DEGREES BELOW
THURSDAY, AND NEAR NORMAL BY FRIDAY ONWARDS.
AS THE CENTER OF THE LOW DEPARTS FURTHER TOWARDS THE EAST, COOL
NORTHERLY FLOW WILL PERSIST THROUGH THE WEEKEND. UNSETTLED
CONDITIONS ARE EXPECTED TO CONTINUE, AS TROUGHING PERSISTS ACROSS
THE NORTHWEST U.S.
AVIATION /00Z MONDAY THROUGH TUESDAY/
ISSUED 538 PM MDT SUN APR 19 2026
VFR. SURFACE WINDS: E-S 5-15 KT WITH GUSTS TO 15-25 KT THIS
AFTERNOON. WINDS ALOFT AT 10KFT MSL: S 10-20 KT.
KBOI...VFR. SURFACE WINDS: SE 5-12 KT.
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.....JM
SHORT TERM...KA
LONG TERM....CH
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