Airshed
Management
System

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

Friday north ID and northwest MT slip into POOR to FAIR dispersion as cooler air and clouds limit surface mixing. Other areas still enough wind for GOOD to EXCELLENT dispersion. 

POOR to FAIR dispersion widespread north ID and most of MT on Saturday as clouds and precip and light winds limit mixing, central and southern ID will more sunshine with unstable conditions for GOOD to EXCELLENT dispersion. Still breezy over parts of southwest MT for FAIR to GOOD dispersion. 

Sunday dispersion worsens for most areas but still remains GOOD to VERY GOOD southern ID.   

Dan Borsum - NRCC Meteorologist

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

POOR to FAIR dispersion widespread north ID and most of MT on Saturday as clouds and precip and light winds limit mixing. central and southern ID will more sunshine with unstable conditions for GOOD to EXCELLENT dispersion. Still breezy over parts of southwest MT for FAIR to GOOD dispersion. 

Sunday dispersion is similar but a bit of increased wind helps improve dispersion to all of southwest MT.

Dan Borsum - NRCC Meteorologist

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

Sunday dispersion is similar but a bit of increased wind helps improve dispersion to all of southwest MT.

Monday upper level low pressure lifts into Canada but still POOR dispersion over north ID and northwest MT due to trapped low level cool air. More of western MT and all of southwest and central and easter MT GOOD to VERY GOOD dispersion with more wind. Central and southern ID lighter winds drive a change to FAIR to GOOD dispersion. 

Dan Borsum - NRCC Meteorologist