383
FXUS65 KBOI 181207
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
607 AM MDT WED MAR 18 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- RECORD HIGH TEMPERATURES WEDNESDAY THROUGH FRIDAY WITH
DRY CONDITIONS.
- A PATTERN SHIFT WITH A COLD FRONT ON SATURDAY WILL BRING
COOLER TEMPERATURES, MOUNTAIN PRECIPITATION, AND BREEZY
WESTERLY WINDS.
SHORT TERM /THROUGH FRIDAY NIGHT/
ISSUED 313 AM MDT WED MAR 18 2026
A RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD OVER THE REGION
DURING THE WORK WEEK, BRINGING RECORD HIGH TEMPERATURES 15-25
DEGREES ABOVE NORMAL. HIGH TEMPERATURES IN THE TREASURE VALLEY
ARE ANTICIPATED TO REACH NEAR OR AT 80F TODAY THROUGH FRIDAY.
TEMPERATURES OVERNIGHT WILL PLUMMET TO THE UPPER 30S/LOW 40S FOR
MOST LOCATIONS, EXCEPT IN AREAS WHERE SOUTHEAST WINDS REMAIN
ELEVATED. WINDS WILL GENERALLY BE LIGHT THROUGH THE PERIOD, WITH
MOSTLY CLEAR SKIES.
LONG TERM /SATURDAY THROUGH WEDNESDAY/
ISSUED 313 AM MDT WED MAR 18 2026
A PATTERN SHIFT WILL COME FOR THE LONG TERM PERIOD WITH A COLD
FRONTAL PASSAGE EARLY SATURDAY. TEMPERATURES WILL DROP BY 10-15
DEGREES WITH CLOUDY SKIES, INCREASED PRECIPITATION CHANCES OVER
HIGH TERRAIN (30-50% CHANCE), AND BREEZY WESTERLY WINDS. ZONAL
FLOW ALOFT WILL THEN HELP KEEP COOLER TEMPERATURES OVER THE
REGION THROUGH MONDAY, ALBEIT STILL ABOUT 5 DEGREES ABOVE
NORMAL. THE RIDGE OF HIGH PRESSURE THEN LOOKS TO REBUILD BRIEFLY
OVER THE REGION ON TUESDAY AND WEDNESDAY. MODEL UNCERTAINTY
REMAINS HIGH WITH REGARDS TO PRECIPITATION CHANCES ON TUESDAY
AND WEDNESDAY, PRIMARILY DEPENDENT ON THE EVOLUTION OF A LOW
OVER WESTERN CANADA. THE BEST CHANCE FOR PRECIPITATION (15-30%
CHANCE) LOOKS TO STAY OVER SOUTHEAST OREGON AND HIGH TERRAIN IN
SOUTHWEST IDAHO THROUGH THE END OF THE LONG TERM PERIOD.
AVIATION /12Z WEDNESDAY THROUGH THURSDAY/
ISSUED 604 AM MDT WED MAR 18 2026
VFR WITH MOSTLY CLEAR SKIES. SURFACE WINDS: VARIABLE LESS THAN
10 KT, EXCEPT SW-NW 5-15 KT NEAR MAGIC VALLEY TERMINALS THIS
EVENING. WINDS ALOFT AT 10KFT MSL: SW-W 15-30 KT.
KBOI...VFR. SURFACE WINDS: SE 4-8 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.....SA
SHORT TERM...SA
LONG TERM....SA
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