354
FXUS65 KBOI 172037
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
237 PM MDT SUN MAY 17 2026
KEY MESSAGES
- BREEZY CONDITIONS OVERNIGHT, WITH FROST AND FREEZE POSSIBLE IN
THE SNAKE PLAIN, MOSTLY EAST OF MOUNTAIN HOME.
- MOUNTAIN SHOWERS ON MONDAY, OTHERWISE DRY, BREEZY AND
SLIGHTLY WARMER.
- DRY WITH TEMPERATURES WARMING BACK ABOVE NORMAL STARTING ON
WEDNESDAY.
SHORT TERM /THROUGH TUESDAY NIGHT/
WIDELY SCATTERED SHOWERS THIS EVENING WILL DISSIPATE WITH
SUNSET, LEAVING DRY CONDITIONS AND CLEAR SKIES OVERNIGHT. THE
SURFACE PRESSURE GRADIENT BEHIND AN EASTWARD EXITING LOW WILL
KEEP BREEZY CONDITIONS ACROSS PORTIONS OF SE OREGON AND THROUGH
MUCH OF THE SNAKE PLAIN TONIGHT. LOW TEMPERATURES BRIEFLY DROP
TO AROUND FREEZING MONDAY MORNING IN PORTIONS OF THE SNAKE PLAIN,
REACHING 31 TO 35 DEGREES EAST OF MOUNTAIN HOME, WHILE THE LOWER
SNAKE WILL FALL TO BETWEEN 36 AND 40 DEGREES. HAVE STAYED WITH A
FREEZE WARNING FOR THE WESTERN MAGIC VALLEY. MONDAY WILL BE DRY
AND BREEZY ACROSS MUCH OF THE AREA, THOUGH NOT AS WINDY AS TODAY
WITH GUSTS OF 25-35 MPH EXPECTED. AFTERNOON INSTABILITY WILL
SUPPORT A SLIGHT CHANCE OF SHOWERS OVER THE MTNS BUT AMOUNTS
WILL BE LIGHT. NORTHWEST FLOW ALOFT CARRIES INTO TUESDAY, BUT A
MORE STABLE AIR MASS WILL KEEP CONDITIONS DRY ACROSS THE REGION
AS TEMPERATURES WARM BACK TO NEAR NORMAL.
LONG TERM /WEDNESDAY THROUGH SUNDAY/
HIGH PRESSURE BUILDING IN ALOFT OVER THE PACIFIC WILL KEEP OUR
AREA UNDER NORTHWEST FLOW TO START THE PERIOD. WEDNESDAY INTO
THURSDAY WILL FEATURE INCREASED CLOUD COVER AND LIGHT, ISOLATED
SHOWERS ACROSS THE WEST CENTRAL MOUNTAINS, AS AN EMBEDDED
SHORTWAVE MOVES THROUGH THE INTERMOUNTAIN WEST. THIS SHORTWAVE
WILL ALSO WORK TO SLOW THE WARMING TREND IN THE LONG-TERM
PERIOD. COME SATURDAY, A DEEPENING ALASKA LOW WILL GIVE WAY TO
ZONAL FLOW ALOFT. DAYTIME HIGHS OF 5-10 DEGREES ABOVE NORMAL AND
GENERALLY DRY CONDITIONS ARE EXPECTED THROUGH THE WEEKEND.
AVIATION /18Z SUNDAY THROUGH MONDAY/
ISSUED 1204 PM MDT SUN MAY 17 2026
GENERALLY VFR. ISOLATE TO SCATTERED RAIN/GRAUPEL SHOWERS THIS
AFTERNOON, TAPERING OFF AFTER SUNSET. PATCHY BLOWING DUST IN THE
SNAKE PLAIN AND E-OREGON. LOCALIZED MVFR/IFR CONDITIONS IN
BLOWING DUST AND PRECIP. SNOW LEVELS: 4.5-5.5 KFT MSL. SURFACE
WINDS: NW-N 15-25 KT WITH GUSTS TO 25-35 KT THIS AFTERNOON.
GUSTS DECREASING OVERNIGHT. WINDS ALOFT AT 10KFT MSL: N 10-30
KT.
KBOI...VFR. A 15% CHANCE OF RAIN/GRAUPEL SHOWERS THIS
AFTERNOON. SURFACE WINDS: NW 10-20 KT WITH GUSTS UP TO 35 KT
THIS AFTERNOON. BECOMING NW 5-15 KT AFTER SUNSET.
BOI WATCHES/WARNINGS/ADVISORIES
ID...WIND ADVISORY UNTIL MIDNIGHT MDT TONIGHT FOR IDZ012-014-015-
029.
FREEZE WARNING FROM MIDNIGHT TONIGHT TO 8 AM MDT MONDAY FOR
IDZ016.
OR...WIND ADVISORY UNTIL MIDNIGHT MDT /11 PM PDT/ TONIGHT FOR
ORZ061>064.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
SHORT TERM...DG
LONG TERM....NF
AVIATION.....NF
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