Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
1256 PM MST Sat Dec 27 2025

IDZ012-014-016-028-033-ORZ061>064-280900-
/O.NEW.KBOI.AS.Y.0005.251229T0100Z-260101T1700Z/
Lower Treasure Valley-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 Indian Valley, New Princeton, Council,
Mesa, Diamond, Soldier, Venator, Baker, Glendale, Fruitvale,
Dunnean, Selby, Twin Falls, Caldwell, Corral, Boise, Fairfield,
Nampa, Malheur City, Crane, Blaine, Burns, Hill City, Cambridge,
Goodrich, Buchanan, Nyssa, and Ontario
1256 PM MST Sat Dec 27 2025 /1156 AM PST Sat Dec 27 2025/

...AIR STAGNATION ADVISORY IN EFFECT FROM 6 PM MST /5 PM PST/ SUNDAY
TO 10 AM MST /9 AM PST/ THURSDAY...

* 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.

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.

&&

$$

KA