131
FXUS65 KBOI 072128
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
228 PM MST FRI NOV 7 2025
SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT
HIGH PRESSURE ALOFT
WILL BUILD OVER THE AREA THIS WEEKEND. THIS WILL KEEP OUR AREA
DRY UNDER MOSTLY CLEAR SKIES. PATCHY MORNING FOG WILL DEVELOP
IN THE MOUNTAIN VALLEYS, BUT THE AIR MASS SHOULD BE DRY ENOUGH
TO PREVENT MORE WIDESPREAD FORMATION. A TEMPERATURE INVERSION
WILL DEVELOP WITH THE MOUNTAINS SEEING MORE WARMING THAN THE
VALLEYS. HOWEVER, EVEN THE VALLEYS SHOULD SEE HIGH TEMPERATURES
NEAR TO SEVERAL DEGREES ABOVE NORMAL, WHILE MOUNTAIN LOCATIONS
WILL BE AROUND 10 DEGREES ABOVE NORMAL BY SUNDAY. WINDS WILL BE
LIGHT THROUGH THE PERIOD, WITH A SLIGHT EAST TO SOUTHEAST
BREEZE DEVELOPING ON SUNDAY.
LONG TERM...MONDAY THROUGH FRIDAY
LARGE-SCALE RIDGING IS
EXPECTED TO REMAIN OVER THE AREA MONDAY THROUGH WEDNESDAY,
SUSTAINING DRY CONDITIONS AND A SLIGHT WARMING TREND. A WEAK AND
MOSTLY DRY SHORTWAVE TROUGH WILL PASS NORTH OF THE AREA LATE
MONDAY AND EARLY TUESDAY, BRINGING SOME CLOUD COVER BUT NO
EXPECTED PRECIPITATION. PEAK VALLEY DAYTIME TEMPERATURES ARE
EXPECTED TO SLOWLY TREND UP INTO THE LOWER TO MID 60S THROUGHOUT
NEXT WEEK UNTIL FRIDAY, WITH THURSDAY EXPECTED TO BE THE
WARMEST DAY WITH POSSIBLE MAXIMUM TEMPERATURES IN THE UPPER 60S.
A LARGE UPPER TROUGH SYSTEM IS EXPECTED TO DIG INTO THE
NORTHWEST REGION LATE WEDNESDAY THROUGH FRIDAY, BRINGING
PRECIPITATION AND A COOLING TREND LATE THURSDAY INTO THE END OF
THE WEEK. THURSDAY WILL GENERALLY SEE A 20-40% CHANCE OF
PRECIPITATION IN THE VALLEYS AND 50-60% IN THE WEST-CENTRAL
MOUNTAINS. FRIDAY WILL SEE MORE WIDESPREAD PRECIPITATION AT
40-50% IN THE VALLEYS AND UP TO AROUND 70% IN THE MOUNTAINS.
SNOW LEVELS ARE EXPECTED TO LINGER IN THE 7000-8000 FT RANGE
THROUGHOUT THE WEEK BEFORE SLOWLY DROPPING INTO THE 6000-7000 FT
RANGE FROM THE E'RN OR SIDE FRIDAY.
AVIATION
VFR. SCATTERED MID-TO-HIGH CLOUDS OVER MOST AREAS.
SCATTERED LOW MTN CEILINGS POSSIBLE THROUGH AFTERNOON. SURFACE
WINDS: W-NW 5-15 KT WITH GUSTS TO 25 KT IN MOST AREAS UNTIL
AFTERNOON AROUND SAT/00Z. HIGHEST GUSTS UP TO 30 KT IN MAGIC
VALLEY. WINDS ALOFT AT 10KFT MSL: W 15-30 KT.
KBOI...VFR WITH PARTLY CLOUDY SKIES. SURFACE WINDS: NW AROUND
10 KT, WITH GUSTS UP TO 20 KT THROUGH AFTERNOON UNTIL SAT/00Z.
WEEKEND OUTLOOK...MOSTLY VFR WITH LOCAL MVFR/IFR IN SHELTERED
VALLEYS DUE TO FOG SATURDAY MORNING. OTHERWISE MOSTLY CLEAR
SATURDAY AND SUNDAY. SURFACE WINDS: VARIABLE UNDER 10 KT
SATURDAY, THEN EASTERLY 5-15 KT SUNDAY. WINDS ALOFT AT 10KFT
MSL: 15 KT OR LESS THROUGH SUNDAY.
AIR STAGNATION
HIGH PRESSURE ALOFT WILL CREATE STABLE
CONDITIONS OVER THE AREA THIS WEEKEND AND INTO NEXT WEEK. THE
RESULTING TEMPERATURE INVERSION AND LIGHT SURFACE WINDS WILL
INTRODUCE A PERIOD OF MORE STAGNANT CONDITIONS. MIXING HEIGHTS
ARE FORECAST TO DROP FROM 2-3KFT FT AGL THIS WEEKEND TO AROUND
2KFT AGL OR LOWER STARTING MONDAY FOR MANY LOWER ELEVATION SITES
ACROSS SE OREGON AND SW IDAHO.
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
SHORT TERM...ST
LONG TERM....JY
AVIATION.....JY
AIR STAGNATION...ST
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