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Dispersion Discussion April 13 2026
Dan Borsum NRCC Predictive Services Meteorologist
Smoke Dispersion Maps and charts on the NRCC Website will be updated MTWTF.
A broad southwest flow and an upper low near the northern California coast will translate into north ID and western MT today. This brings cooler conditions and light winds to northern and central ID and western MT. Expect POOR to FAIR dispersion. Still unstable and warmer in south central and southeast ID and central and eastern MT with GOOD to VERY GOOD dispersion. Southwest MT light winds for POOR to FAIR dispersion.
Approach of a deeper low pressure system midweek creates increasing pressure gradients on Tuesday and supports windier conditions. A bit less cloud cover possible to promote better surface warming. GOOD to EXCELLENT dispersion.
Wednesday main front moves through the eastern half of southern ID and MT for continued winds and VERY GOOD to EXCELLLENT dispersion. High pressure building into western ID shuts the winds off and increased clouds will cool surface temperatures down a bit for POOR to FAIR dispersion.