Airshed
Management
System

Wednesday April 2 2025

Maps of the airshed ratings available here: 

Charts for the individual airsheds here: This includes the airshed table. 

Today weak high pressure over ID brings more widespread stability to most of ID and MT while atmosphere remains more unstable over southern ID.  POOR to FAIR dispersion northern and central ID and western and central MT. Windier in southern MT for FAIR to GOOD dispersion and unstable in more of southern ID for FAIR to GOOD dispersion.  

Thursday broad low pressure across ID and MT with cool temperatures.  Most areas FAIR dispersion with moderate inversions but higher elevations of southwest MT and southeast ID FAIR to GOOD with unstable conditions. 

Friday drying begins to move into the area from the west with FAIR to GOOD dispersion over ID. Still cooler with stronger inversion over MT for POOR to FAIR dispersion. 

Saturday drying but warmer levels warming faster than the surface. FAIR to POOR dispersion. 

Sunday stronger surface warming with FAIR to GOOD dispersion with southern ID GOOD to VERY GOOD dispersion. 

Dan Borsum NRCC Meteorologist