Airshed
Management
System

Airshed charts and summary table can be found here and maps can be found here.

Wednesday breezy conditions keeping FAIR to GOOD dispersion across most of MT and ID. Southwest ID dispersion improves. North ID Panhandle and northwest MT POOR to FAIR dispersion with less mixing due to clouds and precipitation. 

Low pressure consolidates over the PacNW on Thursday and Friday causing a more stable airmass to setup over MT and ID. Most areas POOR dispersion though higher elevations in southwest MT and eastern ID could be above inversion on the ridges for POOR to FAIR dispersion. 

 Dan Borsum - NRCC Meteorologists

Airshed charts and summary table can be found here and maps can be found here.

Low pressure consolidates over the PacNW on Thursday  causing a more stable airmass to setup over MT and ID. Most areas POOR dispersion though higher elevations in eastern ID could be above inversion on the ridges for POOR to FAIR dispersion. 

Friday southwest flow aloft and warmer temperatures begin to influence more of central and southern ID and southwest MT. FAIR dispersion in eastern parts of central ID, most of southern ID and southwest MT. POOR dispersion all other areas as clouds increase which limits surface heating. Winds light most areas. 

Saturday warm air aloft moving through most of the region bringing clouds and precipitation to much of ID. ID Light winds with limited surface mixing for POOR dispersion. In MT many areas will see stronger inversions which will support POOR dispersion. 

 Dan Borsum - NRCC Meteorologists