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Dispersion Discussion March 27 2026
Dan Borsum NRCC Predictive Services Meteorologist
Smoke Dispersion Maps and charts on the NRCC Website will be updated MTWTF.
Friday high pressure dominates ID and western MT for widespread POOR dispersion. In some areas the forecasts indicate the POOR is really close to the POOR to FAIR breakpoint. FAIR to GOOD dispersion over central and eastern MT with southerly winds in response to high pressure over the Dakotas promoting mixing despite mid level inversions.
High pressure shifts east on Saturday increasing instability over ID but winds still relatively light. POOR to FAIR dispersion northern and central ID with stronger westerly winds over southern ID for FAIR to GOOD dispersion. Western MT noticeably stable with light winds. Central and eastern MT a warmer and more unstable with FAIR dispersion.
Frontal system on Sunday brings GOOD to VERY GOOD dispersion to most of the region. Better chances for moisture early next week.