747
FXUS65 KBOI 210016
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
616 PM MDT WED MAY 20 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- MOSTLY DRY WITH TEMPERATURES WARMING THROUGH FRIDAY. BREEZY
CONDITIONS TONIGHT INTO THURSDAY.
- WELL ABOVE NORMAL TEMPERATURES OVER MEMORIAL DAY WEEKEND.
GUSTY WINDS AND A FEW MOUNTAIN SHOWERS ON MEMORIAL DAY.
- TURNING COOLER WITH GUSTY WINDS AND AN INCREASING CHANCE OF
PRECIPITATION STARTING TUESDAY.
SHORT TERM /THROUGH FRIDAY NIGHT/
ISSUED 239 PM MDT WED MAY 20 2026
AN UPPER LEVEL TROUGH WILL DIVE SOUTH ACROSS EASTERN IDAHO
TONIGHT INTO THURSDAY. ASIDE FROM ISOLATED TO SCATTERED SHOWERS
AND THUNDERSTORMS ACROSS THE CENTRAL IDAHO MOUNTAINS TONIGHT,
OUR AREA WILL REMAIN DRY. THE TROUGH WILL PUSH A WEAK COLD FRONT
ACROSS OUR AREA TONIGHT INTO THURSDAY, BRINGING BREEZY
CONDITIONS. WIND GUSTS OF 25-40 MPH WILL DEVELOP BETWEEN BAKER
CITY AND ONTARIO THIS EVENING ALONG THE FRONT, WITH BREEZY
CONDITIONS SPREADING INTO SOUTHERN IDAHO OVERNIGHT. THE
STRONGEST GUSTS ON THURSDAY WILL BE ALONG AND SOUTH OF THE SNAKE
RIVER WITH GUSTS 25-40 MPH, AND GENERALLY 15-25 MPH ELSEWHERE.
TEMPERATURES THURSDAY WILL REMAIN NEARLY STEADY FROM TODAY, OR
NEAR NORMAL. TEMPERATURES WILL WARM ABOUT 5 DEGREES ON FRIDAY
AS A RIDGE OVER THE EASTERN PACIFIC STARTS TO MOVE INLAND. WINDS
WILL BE MUCH LIGHTER ON FRIDAY.
LONG TERM /SATURDAY THROUGH WEDNESDAY/
ISSUED 239 PM MDT WED MAY 20 2026
WARM AND DRY WEATHER WILL CONTINUE THROUGH MEMORIAL DAY WITH
TEMPERATURES RUNNING 10 TO 15 DEGREES ABOVE NORMAL. LOWER VALLEY
LOCATIONS WILL SEE TEMPERATURES IN THE UPPER 80S AND LOW 90S ON
SUNDAY AND MONDAY. WINDY CONDITIONS ARE LIKELY TO DEVELOP IN
OREGON ON MONDAY AFTERNOON AHEAD OF A STRONG COLD FRONT THAT IS
NOW FORECAST TO PASS THROUGH THE AREA ON TUESDAY. VERY WINDY
CONDITIONS ARE LIKELY TO SPREAD INTO IDAHO ON TUESDAY WITH MUCH
COLDER AIR MOVING IN BEHIND THE COLD FRONT. THE UPPER LEVEL
TROUGH DRIVING THE COLD FRONT IS LIKELY TO EVOLVE INTO A CLOSED
LOW BY WEDNESDAY OVER SOUTHERN IDAHO BRINGING COOL AND SHOWERY
WEATHER TO THE AREA WITH SNOW LEVELS COMING DOWN TO AROUND 5000
TO 6000 FEET.
AVIATION /00Z THURSDAY THROUGH FRIDAY/
ISSUED 608 PM MDT WED MAY 20 2026
VFR, WITH SCT-BKN CUMULUS AND HIGH CLOUDS THIS EVENING.
ISOLATED SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER THE
CENTRAL ID MOUNTAINS NE OF KMYL THIS EVENING. SURFACE WINDS:
NW-N 10-15 KT WITH GUSTS UP TO 25 KT OVER MOST AREAS THIS
EVENING, THEN LOWERING TO 6-12 KT AFTER SUNSET. PERIOD OF
STRONG NW GUSTS 25-30 KT OVER KBKE AND KONO THIS EVENING UNTIL
MIDNIGHT. WINDS ALOFT AT 10KFT: NW 20 TO 30 KT.
KBOI...VFR WITH FEW TO SCATTERED HIGH CLOUDS THIS EVENING.
SURFACE WINDS: NW 10-15 KT WITH GUSTS UP TO 25 KT THIS EVENING,
LOWERING DOWN TO 6-11 KT AFTER SUNSET.
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.....JY
SHORT TERM...ST
LONG TERM....JB
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