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...Lower Treasure Valley Zones, and Upper Weiser River.
* WHEN...From 5 AM MST /4 AM PST/ early this morning to 11 AM MST
/10 AM PST/ Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Jan 31, 2026 08:35
Until: Jan 31, 2026 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 continue to trap pollutants.
* WHERE...Portions of south central and southwest Idaho and
northeast and southeast Oregon.
* WHEN...Until noon MST /11 AM PST/ Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Jan 23, 2026 17:43
Until: Jan 24, 2026 19:00
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 noon MST /11 AM PST/ today.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Jan 23, 2026 11:56
Until: Jan 23, 2026 19:00
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 5 AM MST /4 AM PST/ Friday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Jan 21, 2026 20:23
Until: Jan 23, 2026 12:00
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 southwest Idaho and northeast and southeast
Oregon.
* WHEN...Until 11 AM MST /10 AM PST/ Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Jan 18, 2026 23:14
Until: Jan 22, 2026 18:00
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...From 11 PM MST /10 PM PST/ this evening to 5 AM MST /4 AM
PST/ Thursday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Jan 09, 2026 20:27
Until: Jan 10, 2026 21:00
Winter Weather Advisory
* WHAT...Snow. Snow may become heavy at times during the cold front
passage, reducing visibility. Additional snow accumulations of 1
to 3 inches.
* WHERE...Boise Mountains.
* WHEN...Until 5 AM MST Thursday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Plan on slippery road
conditions and reduced visibility.
From: Jan 08, 2026 05:08
Until: Jan 08, 2026 12:00
Winter Weather Advisory
* WHAT...Snow. Snow may become heavy at times during the cold front
passage, reducing visibility. Additional snow accumulations of 1
to 3 inches.
* WHERE...West Central Mountains.
* WHEN...Until 5 AM MST Thursday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Plan on slippery road
conditions and reduced visibility.
From: Jan 08, 2026 05:08
Until: Jan 08, 2026 12:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 3 to 7 inches in
valleys, 10-20 inches above 6000 feet. Gusty winds up to 35 mph
will produce localized blowing and drifting snow.
* WHERE...West Central Mountains.
* WHEN...Until 11 PM MST this evening.
* IMPACTS...Roads will likely become slick and hazardous. Travel
could be very difficult.
From: Jan 07, 2026 09:33
Until: Jan 07, 2026 23:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 3 to 6 inches in
the valleys, 10-16 inches above 6000 feet. Gusty winds up to 35
mph will produce localized drifting and blowing snow.
* WHERE...Boise Mountains.
* WHEN...Until 11 PM MST this evening.
* IMPACTS...Roads will likely become slick and hazardous. Travel
could be very difficult.
From: Jan 07, 2026 09:33
Until: Jan 07, 2026 23:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 3 to 6 inches in
the valleys, 10-16 inches above 6000 feet. Gusty winds up to 35
mph will produce localized drifting and blowing snow.
* WHERE...Boise Mountains.
* WHEN...Until 11 PM MST Wednesday.
* IMPACTS...Roads will likely become slick and hazardous. Travel
could be very difficult.
From: Jan 06, 2026 21:45
Until: Jan 07, 2026 10:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 3 to 7 inches in
valleys, 10-20 inches above 6000 feet. Gusty winds up to 35 mph
will produce localized blowing and drifting snow.
* WHERE...West Central Mountains.
* WHEN...Until 11 PM MST Wednesday.
* IMPACTS...Roads will likely become slick and hazardous. Travel
could be very difficult.
From: Jan 06, 2026 21:45
Until: Jan 07, 2026 10:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 5 to 10 inches
in valleys, 10-20 inches above 6000 feet. Gusty winds will
produced localized blowing and drifting snow.
* WHERE...West Central Mountains.
* WHEN...From 2 PM Tuesday to 11 PM MST Wednesday.
* IMPACTS...Roads will likely become slick and hazardous. Travel
could be very difficult.
From: Jan 05, 2026 20:49
Until: Jan 06, 2026 13:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations of 3 to 7 inches in
the valleys, 12-18 inches above 6000 feet. Gusty winds will
produce localized drifting and blowing snow.
* WHERE...Boise Mountains.
* WHEN...From 2 PM Tuesday to 11 PM MST Wednesday.
* IMPACTS...Roads will likely become slick and hazardous. Travel
could be very difficult.
From: Jan 05, 2026 20:49
Until: Jan 06, 2026 13:00
Winter Weather Advisory
* WHAT...Snow expected. Total snow accumulations 5 to 9 inches. Wind
gusts as high as 35 mph causing blowing and drifting snow.
* WHERE...West Central Mountains.
* WHEN...From 11 PM Tuesday to 5 PM MST Wednesday.
* IMPACTS...Roads, and especially bridges and overpasses, will
likely become slick and hazardous. Travel could be very difficult.
From: Jan 05, 2026 09:00
Until: Jan 05, 2026 22:00
Dense Fog Advisory
* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Lower Treasure Valley.
* WHEN...Until 7 AM MST Saturday.
* IMPACTS...Low visibility could make driving conditions hazardous.
From: Jan 03, 2026 05:06
Until: Jan 03, 2026 14:00
Winter Weather Advisory
* WHAT...Rain and light freezing rain. Very light ice accumulations
possible.
* WHERE...Lower Treasure Valley Zones, and Malheur County.
* WHEN...Until 5 AM MST /4 AM PST/ Friday.
* IMPACTS...Very slippery sidewalks, roads and bridges are possible.
From: Jan 02, 2026 05:42
Until: Jan 02, 2026 12:00
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 southwest Idaho and southeast Oregon.
* WHEN...Until 8 AM MST /7 AM PST/ Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 31, 2025 11:30
Until: Jan 01, 2026 22:00
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 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 19:21
Until: Jan 01, 2026 17:00
Air Stagnation Advisory
* WHAT...A 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...Boise Mountains and West Central Mountains.
* WHEN...Until 8 AM MST Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 30, 2025 20:25
Until: Dec 31, 2025 13:00
Air Stagnation Advisory
* WHAT...A 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 southwest Idaho and southeast Oregon.
* WHEN...Until 8 AM MST /7 AM PST/ Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 30, 2025 20:25
Until: Dec 31, 2025 13:00
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 5 AM MST /4 AM PST/ Saturday.
* IMPACTS...Poor air quality may cause issues for people with
respiratory problems.
From: Dec 30, 2025 09:58
Until: Dec 30, 2025 22:00
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
