Near-surface smoke will remain relatively limited across much of Idaho today, with localized impacts near active wildfires and a more organized area of smoke moving into western Idaho. Areas of light smoke and haze are expected across portions of North and Central Idaho, with moderate concentrations near active fires. Across South Idaho, much of the Snake River Plain and East Idaho will remain comparatively clear, while south to southwesterly flow transports smoke northward from California into southeast Oregon and southwest Idaho. Light to moderate smoke is expected to spread across portions of southwest and west-central Idaho this afternoon.
Overnight into Wednesday morning, continued south to southwesterly flow will carry the California smoke plume northward through western Idaho. Light to moderate smoke may extend from southwest Idaho into the West Central Mountains, while smoke concentrations gradually decrease farther south as the plume shifts northward. Areas of light smoke will also persist across North and Central Idaho, with localized moderate concentrations near active wildfires. Much of East Idaho should remain relatively clear of widespread near-surface smoke.
Wednesday, strengthening southwesterly winds and
increasing shower and thunderstorm activity should improve smoke dispersion
across much of the state. The plume affecting western Idaho will become
increasingly diffuse as it shifts north and northeast, leaving mainly light
smoke and haze across portions of southwest and Central Idaho by Wednesday
afternoon. North Idaho will continue to see areas of light smoke with localized
higher concentrations near active fires. Gusty winds and thunderstorm outflows
may cause rapid localized changes in plume direction, but widespread smoke
accumulation should remain limited. The highest AQI levels are expected near
active wildfires with periods of UNHEALTHY FOR SENSITIVE GROUPS air quality are
possible.
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