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Dispersion Discussion May 6 2026
Dan Borsum NRCC Predictive Services Meteorologist
Smoke Dispersion charts and maps on the NRCC Website will be updated MTWTF.
GOOD to VERY GOOD dispersion today with strong sunshine most areas and unstable lapse rates lower portion of the airmass. Exceptions will be western parts of ID like AS11, AS14, AS15 and AS22 where mid level warming will create stronger inversions creating POOR to FAIR dispersion. Smoke is expected to move in the afternoon hours as peak heating generates some mixing of winds especially in MT and east central ID.
Weak disturbance moves through Wednesday night and increased cloud cover over northwest MT and north ID will offset warmer temperatures with FAIR to GOOD dispersion on Thursday. Other areas increased wind in its wake of the disturbance will improve dispersion VERY GOOD to EXCELLENT.
Decreased cloud cover and warmer temperatures on Friday will support GOOD to VERY GOOD dispersion.
High pressure strengthening over ID and northwest MT will bring stronger inversions and decreased dispersion for north ID and northwest MT but other areas will maintain stronger winds and keep GOOD dispersion in place.