Air Stagnation Advisory
Status
Event Continued Active alertStart Time
Wed 01/21/2026 03:23 PM ESTEnd Time
Fri 01/23/2026 07:00 AM ESTSignificance
AdvisoryImpacts
Low impact
Locations Affected
Boise, ID ∙ Nampa, ID ∙ Meridian, ID ∙ Calamity Butte, OR ∙ Mahogany Mountain, OR ∙ Cambridge, ID ∙ Trinity Mountain, ID ∙ Adrian, OR ∙ Nampa Municipal Airport, ID ∙ Smiths Ferry, IDFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service Boise ID 123 PM MST Wed Jan 21 2026 ...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST /4 AM PST/ FRIDAY... * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons with respiratory illness should follow their physicians advice for dealing with high levels of air pollution during periods of stagnant air.
Technical Header
IDZ011>014-016-028-033-ORZ061>064-221400- /O.CON.KBOI.AS.Y.0001.000000T0000Z-260123T1200Z/ West Central Mountains-Lower Treasure Valley-Boise Mountains- Upper Treasure Valley-Western Magic Valley-Camas Prairie-Upper Weiser River-Harney County-Baker County-Malheur County-Oregon Lower Treasure Valley- Including the cities of Cambridge, Burns, New Princeton, Council, Baker, Anderson Dam, Goodrich, Buchanan, Crane, Diamond, Glendale, Prairie, Mesa, Ola, Malheur City, Caldwell, Big Creek, Fairfield, Fruitvale, Boise, Ontario, Cascade, Indian Valley, Twin Falls, Blaine, Dunnean, Bear, Warm Lake, Hill City, Cuprum, Nyssa, Corral, Soldier, McCall, Venator, Nampa, Selby, and Pine 123 PM MST Wed Jan 21 2026 /1223 PM PST Wed Jan 21 2026/
