Airshed
Management
System

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

Upper level high pressure begins to build in by Wednesday. The pattern generally favors POOR dispersion with the cold air trapped at the surface with warmer air aloft enhancing inversions later in the week. 

A few exceptions to note: 

Southwest ID will see stronger valley winds due to solar warming so POOR to FAIR dispersion in southwest ID Tuesday and Wednesday.  

Cold front moving through eastern MT brings POOR to FAIR dispersion to eastern MT on Thursday.

Next weekend indicates some ridge breakdown potential for increased winds. 

Rebekah McCormick/Dan Borsum - NRCC Meteorologists

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

Upper level high pressure maintains a stable airmass for most of ID and MT through Friday. Exception will be eastern MT on Thursday with better winds behind a cold front going through the Dakotas. 

A strong disturbance tracking across Canada brings good mixing to a large portion of the region by Saturday. This will present an opportunity to scour most valleys before winds begin to decrease and inversions strengthen Sunday into Monday. Southern ID and eastern MT will hang onto better dispersion for a few days before a more stable regime sets in by Tuesday. 

 Dan Borsum - NRCC Meteorologists