Lingering smoke continues near active smoldering fires. Today's satellite imagery shows visible smoke pooled in valleys near the Sisi and Little Giant Fires, as well as the Luna and Border 2 Fires in the North Cascades. The Three Queens and King Fires also continue to produce moderate smoke.
| Satellite imagery from Sept. 18 (Terra/MODIS). This morning's (9am) hourly PM2.5 concentrations shown in the circles. |
As long as these fires smolder, nearby and downwind communities will continue to experience smoke impacts. Areas including Cle Elum Lake, Lake Wenatchee, Lake Chelan, and Ross Lake will observe intermittent smoke, with Stehekin experiencing the most persistent smoke due to its proximity to the Sisi Fire. Warm and dry weather will continue for at least the next week, with only a chance of minimal rain next Friday. Until widespread rain arrives, expect the familiar pattern of overnight and early-morning smoke pooling in valleys and downslope areas, followed by gradual improvement throughout the day.
| Low hanging smoke over Cle Elum this morning due to smoldering on the Three Queens Fire. |
With the peak of wildfire season behind us, agricultural burning is now underway in the Columbia Basin and Idaho. Communities in southeast Washington may see occasional periods of moderate smoke from agricultural burning throughout the rest of the month. Prescribed burning will also start to increase as we transition into fall.
This Year's Wildfire Season - Compared to Prior Years
This year's wildfire season began quickly with numerous lightning ignitions in mid-July and continued steadily through August. The plot below highlights daily average PM2.5 concentrations that were USG or worse over the last 15 years, as observed by the statewide monitoring network (no purple air sensors). This year was characterized by a fast start, minimal relief, and now a slow finish as smoke from lingering fires continues to impact nearby communities. This is in contrast to other years which sustained more smoke impacts through September or experienced more intermittent smoke impacts spread across the season.




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