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Dispersion Discussion April 10 2026
Dan Borsum NRCC Predictive Services Meteorologist
Smoke Dispersion Maps and charts on the NRCC Website will be updated MTWTF.
Friday upper level high pressure moves across ID with the axis of high pressure along the MT/ID border by afternoon. This creates stable conditions over north ID and western MT for POOR to FAIR dispersion. Central and eastern MT not quite as stable and still enough wind for FAIR to GOOD dispersion. Southern ID becomes unstable later in the day for GOOD to VERY GOOD dispersion with scattered thunderstorms possible.
Saturday the upper level high pressure continues to shift east bringing the instability into western MT and very warm conditions for central and eastern MT for GOOD to VERY GOOD dispersion. Northern ID cooler with some cloud cover to trap some air in the valleys for POOR to FAIR dispersion. Unstable and breezy central and southern ID for FAIR to GOOD dispersion.
Sunday cooler air and clouds impact MT and north ID with POOR to FAIR dispersion with likely shower activity. Still unstable and breezier over southern ID for GOOD to VERY GOOD dispersion.