Air Stagnation Advisory
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will trap pollutants in the valleys.
* WHERE...In the valleys of south central and southwest Idaho and
northeast and southeast Oregon below 5000 feet MSL.
* WHEN...From 6 PM MST /5 PM PST/ Sunday to 10 AM MST /9 AM PST/
Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 29, 2025 01:00
Until: Jan 01, 2026 17:00
Air Stagnation Advisory
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will continue to trap pollutants.
* WHERE...Portions of south central and southwest Idaho and
northeast and southeast Oregon.
* WHEN...Until 10 AM MST /9 AM PST/ Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 29, 2025 09:49
Until: Dec 29, 2025 21:00
Air Stagnation Advisory
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will trap pollutants in the valleys.
* WHERE...Portions of southwest Idaho and southeast Oregon.
* WHEN...From 6 PM MST /5 PM PST/ this evening to 10 AM MST /9 AM
PST/ Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 28, 2025 19:15
Until: Dec 29, 2025 14:00
Winter Weather Advisory
* WHAT...Snow showers, heavy at times. Additional snow accumulations
of 3 to 7 inches. Winds gusting as high as 40 mph on the mountain
peaks.
* WHERE...Boise Mountains and West Central Mountains.
* WHEN...Until 5 AM MST Saturday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Reduced visibilities. Travel
could be difficult.
From: Dec 26, 2025 20:32
Until: Dec 27, 2025 12:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 4 to 7 inches in
the valleys and up to 18 inches for the mountain peaks. Winds
gusting as high as 35 mph Friday morning.
* WHERE...West Central Mountains.
* WHEN...From 5 AM Friday to 5 AM MST Saturday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Travel could be very difficult.
From: Dec 25, 2025 20:12
Until: Dec 26, 2025 12:00
Winter Weather Advisory
* WHAT...Snow expected. Up to 3 inches in lower elevation valleys, 4
to 7 inches in higher elevation valleys and up to 18 inches for
the mountain peaks. Winds gusting as high as 35 mph Friday morning.
* WHERE...Boise Mountains.
* WHEN...From 5 AM Friday to 5 AM MST Saturday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Travel could be very difficult.
From: Dec 25, 2025 20:12
Until: Dec 26, 2025 12:00
Avalanche Warning
The following message is transmitted at the request of the Forest
Service Sawtooth Avalanche Center.
...The Forest Service Sawtooth Avalanche Center in Ketchum Idaho
has issued a BACKCOUNTRY AVALANCHE WARNING...
* WHAT...The avalanche danger is HIGH. Heavy snowfall and wind
will produce widespread avalanching.
* WHERE...The southern Salmon River, Sawtooth, White Cloud,
Smoky, Soldier, Boulder, and Pioneer Mountains, including the
mountains near Banner Summit, Stanley, Smiley Creek, Atlanta,
Galena Summit, Trail Creek Summit, and Dollarhide Summit.
* WHEN...In effect from Sun 06:45 MST to Mon 07:00 MST.
* IMPACTS...Natural and human-triggered avalanches large enough
to bury people, snap trees, and destroy structures will occur.
Avalanches may strike roadways, trails, and buildings in the
valley bottom.
From: Dec 21, 2025 14:10
Until: Dec 22, 2025 14:15
Air Stagnation Advisory
* WHAT...An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that will continue to trap pollutants.
* WHERE...Portions of south central and southwest Idaho and
northeast and southeast Oregon.
* WHEN...From 5 AM MST /4 AM PST/ Friday to 5 AM MST /4 AM PST/
Monday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 12, 2025 12:00
Until: Dec 15, 2025 12:00
Dense Fog Advisory
* WHAT...Visibility ranging from one half mile to one quarter mile
or less in low elevation valleys.
* WHERE...Portions of southwest Idaho and southeast Oregon.
* WHEN...Until 9 AM MST /8 AM PST/ Friday.
* IMPACTS...Low visibility could make driving conditions hazardous.
From: Nov 28, 2025 05:05
Until: Nov 28, 2025 16:00
Dense Fog Advisory
* WHAT...Visibility one quarter mile or less in dense fog
* WHERE...Portions of southwest Idaho and southeast Oregon.
* WHEN...Until 10 AM MST /9 AM PST/ this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...Fog is expected mainly from Ontario through
Boise.
From: Nov 23, 2025 08:14
Until: Nov 23, 2025 17:00
Dense Fog Advisory
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Western Magic Valley, Lower Treasure Valley, and Upper
Treasure Valley.
* WHEN...From 11 PM this evening to 10 AM MST Saturday.
* IMPACTS...Low visibility could make driving conditions hazardous.
From: Nov 21, 2025 20:07
Until: Nov 22, 2025 14:00
