583
FXUS65 KBOI 220452
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1052 PM MDT THU MAY 21 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- MOSTLY DRY WITH TEMPERATURES 10 TO 15 DEGREES ABOVE NORMAL
FOR MEMORIAL DAY WEEKEND.
- GUSTY WINDS ARRIVING ON MONDAY AHEAD OF A COLD FRONT,
RESULTING IN ELEVATED FIRE WEATHER CONDITIONS.
- MUCH COOLER WITH GUSTY WINDS AND A CHANCE OF SHOWERS AND
THUNDERSTORMS TUESDAY AND WEDNESDAY.
SHORT TERM /THROUGH SATURDAY NIGHT/
ISSUED 220 PM MDT THU MAY 21 2026
A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE AREA FRIDAY AND
SATURDAY. TEMPERATURES FRIDAY WILL BE ABOUT 5 DEGREES WARMER
THAN TODAY, FOLLOWED BY ANOTHER 5-10 DEGREES OF WARMING ON
SATURDAY AS THE RIDGE MOVES OVERHEAD. THIS WILL PLACE HIGH
TEMPERATURES 10-15 DEGREES ABOVE NORMAL, WITH LOWER ELEVATIONS
REACHING THE MID TO UPPER 80S. CONDITIONS WILL REMAIN DRY,
EXCEPT FOR A 10-20% CHANCE OF SHOWERS AND THUNDERSTORMS NEAR THE
NEVADA BORDER AS MOISTURE LIFTS NORTH WITH THE BUILDING RIDGE.
WINDS WILL MOSTLY BE LIGHT, EXCEPT FOR BREEZY CONDITIONS IN THE
HIGHER TERRAIN SATURDAY AFTERNOON.
LONG TERM /SUNDAY THROUGH THURSDAY/
ISSUED 220 PM MDT THU MAY 21 2026
SUNDAY AND MONDAY SEE TEMPERATURES 10-15 DEGREES ABOVE NORMAL
AS HIGH PRESSURE SITS OVER THE AREA. AFTERNOON MINIMUM RHS ARE
DRY AT 10-30%, INCREASING WITH ELEVATION. THE WARM WEATHER COOLS
DOWN MONDAY EVENING AS A COLD FRONT MOVES THROUGH, PART OF A
LARGER UPPER LEVEL LOW THAT SITS OVER THE AREA FOR A FEW DAYS.
THE COLD FRONT BRINGS WIND GUSTS UP TO 45 MPH MONDAY AND TUESDAY
EVENINGS. WHILE TUESDAY WILL BE MUCH COOLER, THE GUSTY WINDS,
DRY CONDITIONS, AND WARM TEMPERATURES SUPPORT ELEVATED FIRE
WEATHER RISKS MONDAY AFTERNOON AND EVENING. MAKING THE FORECAST
EVEN TRICKIER, EACH AFTERNOON SEES A 20-30% CHANCE OF
THUNDERSTORMS THROUGH THE LONG TERM AS THE LOW PRESSURE KEEPS
CONDITIONS UNSETTLED. BEST STORM CHANCES MOVE FROM THE NV BORDER
SUNDAY/MONDAY TO CENTRAL ID TUESDAY AND MOST OF SW ID WEDNESDAY
AND THURSDAY. TEMPERATURES GRADUALLY WARM AFTER TUESDAY.
AVIATION /06Z FRIDAY THROUGH SATURDAY/
ISSUED 1052 PM MDT THU MAY 21 2026
VFR WITH SCT-BKN HIGH CLOUDS OVERNIGHT THROUGH MORNING. SURFACE
WINDS: MOSTLY VARIABLE UNDER 10 KT OVERNIGHT THROUGH MORNING, THEN
W-NW 5-15 KT IN THE AFTERNOON.
KBOI...VFR WITH SCATTERED HIGH CLOUDS OVERNIGHT. SURFACE WINDS: S-SE
5-10 KT OR VARIABLE OVERNIGHT THROUGH MORNING, THEN NW 7-12 KT IN
THE AFTERNOON.
WEEKEND OUTLOOK...VFR WITH MOSTLY CLEAR SKIES THROUGHOUT THE
WEEKEND. WINDS SE OR VARIABLE 5-10 KT IN THE NIGHT/MORNING AND W-NW
5-15 KT IN THE AFTERNOON EACH DAY. SOME ISOLATED AFTERNOON
THUNDERSTORMS POSSIBLE NEAR NV BORDER EACH DAY.
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.....LC
SHORT TERM...ST
LONG TERM....JM
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