Weather Warnings for Idaho

Issued by the National Weather Service

Current watches, warnings, and advisories for Idaho
Alerts Updated: January 21, 2026, 12:00 am  UTC


Air Stagnation Advisory issued January 20 at 1:47PM MST until January 23 at 5:00AM MST by NWS Boise ID

Summary: * 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.
Severity:  Moderate    Effective:  January 20, 2026, 1:47 pm      Expires:  January 21, 2026, 7:00 am
Area:  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


Air Stagnation Advisory issued January 20 at 9:31AM MST until January 22 at 12:00PM MST by NWS Pocatello ID

Summary: * WHAT...Stagnant conditions will persist due to little vertical mixing and light winds. Degraded air quality is expected to continue as pollutants remained trapped near the surface. * WHERE...Franklin/Eastern Oneida Region and Lower Snake River Plain. * WHEN...Until noon MST Thursday. * IMPACTS...Periods of air stagnation can lead to the buildup of pollutants near the surface.
Severity:  Moderate    Effective:  January 20, 2026, 9:31 am      Expires:  January 22, 2026, 12:00 pm
Area:  Lower Snake River Plain; Franklin/Eastern Oneida Region