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Dispersion Discussion April 2 2026
Dan Borsum NRCC Predictive Services Meteorologist
Smoke Dispersion Maps and charts on the NRCC Website will be updated MTWTF.
Thursday low pressure moves into western parts of the region bringing chances for rain and snow. With developing low pressure expect breezy conditions for most areas FAIR to GOOD dispersion with sheltered valleys in north ID and northwest MT POOR to FAIR dispersion. More unstable in southern ID for GOOD to VERY GOOD dispersion.
Friday system maintains winds over MT for FAIR to GOOD dispersion but ID begins to see building high pressure for POOR to FAIR dispersion. Southern ID has deeper mixing due to warmer temperatures for FAIR to GOOD dispersion.
Saturday similar to Friday except southern ID becoming more stable with warmer air aloft moving in. ID POOR to FAIR dispersion. Central, southwest and Eastern MT FAIR to GOOD dispersion with stronger winds western MT POOR to FAIR with less wind and stronger inversions.