714
FXUS65 KBOI 151213
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
613 AM MDT FRI MAY 15 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- NORMAL TEMPS TODAY BEFORE ANOTHER COOLDOWN THIS WEEKEND,
CONDITIONS STAY DRY AND BREEZY.
- ANOTHER ROUND OF PRECIPITATION SATURDAY NIGHT INTO SUNDAY
WITH LOWER SNOW LEVELS WILL BRING SNOW TO HIGHER ELEVATIONS.
- PATCHY FROST POSSIBLE SUNDAY AND MONDAY MORNING MAINLY EAST OF
MOUNTAIN HOME.
SHORT TERM /THROUGH SUNDAY NIGHT/
ISSUED 246 AM MDT FRI MAY 15 2026
DRY ZONAL FLOW REMAINS OVER THE REGION TODAY, KEEPING
CONDITIONS STABLE WITH TEMPERATURES NEAR SEASONAL NORMALS. HIGHS
WILL REACH THE UPPER 60S AND LOW 70S IN THE LOWER VALLEYS.
WINDS WILL STAY LIGHT THROUGH TONIGHT BEFORE THE NEXT SYSTEM
APPROACHES FROM THE NORTHWEST.
ON SATURDAY, A COLD UPPER LEVEL TROUGH WILL DIVE SOUTH FROM THE
GULF OF ALASKA, CROSSING INTO SOUTHEAST OREGON AND SOUTHWEST
IDAHO BY THE AFTERNOON. THIS SYSTEM WILL USHER IN A
SIGNIFICANTLY COLDER AIR MASS. BREEZY TO WINDY CONDITIONS WILL
DEVELOP SATURDAY AFTERNOON, WITH WEST TO NORTHWEST GUSTS BETWEEN
30 AND 40 MPH COMMON ACROSS THE SNAKE RIVER PLAIN. THIS COULD
CREATE PERIODS OF BLOWING DUST. PRECIPITATION WILL BE LIMITED
BUT FOCUSED OVER THE MOUNTAINS. AS THE COLD AIR FILTERS IN
SATURDAY NIGHT, SNOW LEVELS WILL DROP QUICKLY TO AROUND 5000
FEET. LIGHT SNOW ACCUMULATIONS ARE POSSIBLE ON MOUNTAIN PEAKS
AND HIGHER PASSES BY SUNDAY MORNING.
THE CORE OF THE COLD POOL WILL SETTLE OVER THE REGION ON
SUNDAY. DAYTIME HIGHS WILL BE 10 TO 15 DEGREES BELOW NORMAL,
STRUGGLING TO EXIT THE 50S IN MANY VALLEY LOCATIONS. BREEZY
NORTHWEST WINDS WILL PERSIST THROUGH THE AFTERNOON, MAKING IT
FEEL EVEN COOLER. AS SKIES CLEAR AND WINDS DIMINISH SUNDAY
NIGHT, EXCELLENT RADIATIONAL COOLING IS EXPECTED. FROST WILL BE
A PRIMARY CONCERN ACROSS THE SNAKE RIVER PLAIN WITH THE BEST
CHANCE ACROSS WESTERN MAGIC VALLEY EARLY SUNDAY MORNING WHERE
TEMPERATURES ARE FORECAST TO DIP INTO THE LOW TO MID 30S.
LONG TERM /MONDAY THROUGH FRIDAY/
ISSUED 246 AM MDT FRI MAY 15 2026
A GRADUAL WARMING TREND BEGINS MONDAY AS THE TROUGH DEPARTS TO
THE EAST AND A WEAK RIDGE BUILDS IN FROM THE PACIFIC. AFTER A
CHILLY START WITH FROST POTENTIAL IN THE MAGIC VALLEY,
TEMPERATURES WILL REBOUND UNDER SUNNY SKIES.TEMPERATURES SHOULD
RETURN TO NEAR NORMAL LEVELS BY WEDNESDAY. DRY CONDITIONS ARE
EXPECTED TO PREVAIL THROUGH THE REMAINDER OF THE LONG TERM
PERIOD UNDER A MORE STABLE NORTHWEST FLOW.
AVIATION /12Z FRIDAY THROUGH SATURDAY/
ISSUED 610 AM MDT FRI MAY 15 2026
VFR WITH MOSTLY CLEAR SKIES TODAY. SURFACE WINDS: LIGHT AND
VARIABLE THIS MORNING, THEN BECOME W-NW 5-15 KT THIS AFTERNOON.
WINDS ALOFT AT 10KFT MSL: W 20-30 KT.
KBOI...VFR. SURFACE WINDS: LIGHT AND VARIABLE LESS THAN 5 KTS
BECOMING NORTHWESTERLY 8 TO 12 KTS THIS AFTERNOON.
WEEKEND OUTLOOK: A COLD FRONTAL PASSAGE SAT-SUN WILL BRING SCATTERED
RAIN/SNOW SHOWERS OVER MOUNTAINS AND GUSTY W-NW WINDS THROUGHOUT THE
WEEKEND. LOCALIZED MVFR-IFR CONDITIONS AND MOUNTAIN OBSCURATION IN
SHOWERS. SNOW LEVELS WILL DROP FROM 5.5-6.5KFT SATURDAY TO THE 3.5-
5KFT SUNDAY. SURFACE WINDS: W-NW 10-20 KT SAT, WITH GUSTS 25-35 KT.
STRONGER WINDS SUNDAY AT NW 15-25 KT WITH GUSTS 30-40 KT OVER MOST
AREAS.
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.....JDS
SHORT TERM...JDS
LONG TERM....JDS
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