Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Pocatello ID
331 AM MST Sat Jan 17 2026

IDZ054-059-172015-
/O.CON.KPIH.AS.Y.0001.000000T0000Z-260118T1900Z/
Lower Snake River Plain-Franklin/Eastern Oneida Region-
Including the cities of American Falls, Malad, Thatcher,
Blackfoot, Preston, Fort Hall, Pocatello, and Shelley
331 AM MST Sat Jan 17 2026

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL NOON MST SUNDAY...

* WHAT...Stagnant conditions will persist due to little vertical
  mixing and light winds. Degraded air quality is expected
  throughout the week as pollutants remained trapped near the
  surface.

* WHERE...Franklin/Eastern Oneida Region and Lower Snake River Plain.

* WHEN...Until noon MST Sunday.

* IMPACTS...Periods of air stagnation have led to the buildup of
  pollutants near the surface.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If possible, reduce or eliminate activities that contribute to air
pollution, such as outdoor burning, and the use of residential wood
burning devices. Reduce vehicle trips and vehicle idling as much as
possible. Check with local agencies for possible restrictions in
your area.

&&

$$

Visit weather.gov/pocatello for more information.

JKeyes

URGENT - WEATHER MESSAGE
National Weather Service Boise ID
154 PM MST Fri Jan 16 2026

IDZ011>014-016-028-033-ORZ061>064-172200-
/O.EXT.KBOI.AS.Y.0001.000000T0000Z-260121T0000Z/
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 Diamond, Dunnean, Pine, New Princeton,
Blaine, Twin Falls, Glendale, Cambridge, Fruitvale, Mesa, Nampa,
McCall, Ontario, Ola, Big Creek, Warm Lake, Venator, Boise,
Prairie, Council, Hill City, Crane, Buchanan, Goodrich, Burns,
Selby, Cascade, Indian Valley, Soldier, Nyssa, Fairfield,
Anderson Dam, Baker, Cuprum, Caldwell, Corral, Bear, and Malheur
City
154 PM MST Fri Jan 16 2026 /1254 PM PST Fri Jan 16 2026/

...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 5 PM MST /4 PM PST/
TUESDAY...

* 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 PM MST /4 PM PST/ Tuesday.

* 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.

&&

$$

ST

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1057 AM PST Thu Jan 15 2026

IDZ005>007-210000-
/O.EXT.KMSO.AS.Y.0001.000000T0000Z-260121T0000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-
1057 AM PST Thu Jan 15 2026

...AIR STAGNATION ADVISORY NOW IN EFFECT UNTIL 4 PM PST TUESDAY...

* WHAT...Stagnation conditions will trap pollutants, leading to
  deteriorating air quality, particularly in lower elevations and
  valleys.

* WHERE...Orofino/Grangeville Region, Southern Clearwater Mountains,
  and Northern Clearwater Mountains.

* WHEN...Until 4 PM PST Tuesday.

* IMPACTS...Periods of air stagnation can lead to the build up of
  pollutants near the surface.

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.

According to state air quality agencies, prolonged period of
stagnant air can hold pollutants close to the ground where people
live and breathe. Check with your local burn agency for any current
restrictions in your area.

&&

$$