Twin Falls, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

150
FXUS65 KBOI 020349
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
849 PM MST Sun Feb 1 2026

.DISCUSSION...A weak cold front will move just to our east
on Monday with slightly cooler temperatures aloft Monday
morning. Clearing expected tonight with good radiational
cooling. Fog will have a better chance at forming tonight in the
lower Treasure Valley with the clearing. Upper level ridge
strengthens on Monday and Tuesday and moves overhead by
Thursday. Current forecast reflects this with no updates
planned.

&&

.AVIATION...VFR overnight with some mid to high clouds, and
continued VFR Monday. Areas of MVFR/IFR possible in the Lower
Treasure Valley of Oregon and Idaho 04-17Z. Surface winds:
variable less than 8 kt, favoring WNW by Monday afternoon.
Winds aloft at 10kft MSL: SW 15-30 kt.

KBOI...VFR with some mid and high clouds. Surface winds variable
less than 5 kt, leaning NW after 17Z Monday.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Tuesday night...A band of mid/high
clouds due to a weak Pacific cold front aloft was passing through
our CWA this afternoon. Clouds will decrease from west to east
this evening. Higher elevations will cool a few degrees tonight
and Monday as the associated upper trough flattens the
persistent main ridge. Lower elevations will not be affected.
The ridge will re-amplify Tuesday and higher elevations will
get warmer again. The warming will intensify the inversion in
the valleys below, with the usual patchy fog and low clouds in
the night and morning hours. Light winds through Tuesday night.
No pcpn.

LONG TERM...Wednesday through Sunday...Amplified high pressure
along the California coast will become a closed system as it
slowly steers eastward through the end of the week. Dry and
stagnant conditions will be expected Wednesday through early
Friday. Fog/low stratus and colder temperatures will likely
return for the basins. A dry and weak shortwave trough will
likely move through the area Friday through Saturday, possibly
breaking the inversion. Latest long-term guidance now projects a
longwave trough digging into the region Sunday, likely bringing
precipitation. For now, most precipitation will be rain across
except at highest elevations, which may see snow.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Air Stagnation Advisory until 11 AM MST Friday IDZ012-033.
OR...Air Stagnation Advisory until 11 AM MST /10 AM PST/ Friday
     ORZ064.

&&

$$

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DISCUSSION...KA
AVIATION.....MC
SHORT TERM...LC
LONG TERM....JY