Service Description: Study of frequency of air movement into some of the most frequently impacted communities by wildfire smoke during the summer in the Pacific Northwest.
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Description: The image represents the relative frequency of air movement into some of the most frequently impacted communities by wildfire smoke during the summer in the Pacific Northwest.Three Rankings are used to represent the frequent air pathways: High represents grid cells in which the pathway of air moving into the associated community occurs greater than 25% of the time, Medium equals 9 to 25%, and Low indicates 3 to 9%. Grid cells with less than 3% frequency are not colored. Each grid cell is 3 km by 3 km in size.
If a wildfire occurs within one of these frequent air pathways and is not suppressed quickly, its likely that smoke will impact the associated community for a relatively long period of time. Should a fire occur outside of the frequent air pathways, smoke may still impact a given community, but not as likely as if it occurred within a frequent air pathway. Also, some communities have not been modeled, so these images would not necessarily be helpful in predicting smoke impacts in those locations.
The following communities are included, in Washington: Colville, Ellensburg, Leavenworth, Republic, Seattle, Spokane, Toppenish, Twisp, and Wenatchee; in Oregon: Ashland, Baker City, Bend, Burns, Cave Junction, Enterprise, Eugene, Grants Pass, Hood River, John Day, Klamath Falls, Lakeview, Medford, Oakridge, Pendleton, Portland, Prineville, Roseburg, Shady Cove, Sisters, and The Dalles; in northern California: Crescent City, Redding, Ukiah, Weaverville, Willows, and Yreka.
The images were created by modeling back-trajectories for 36-hours, beginning in each community, four times a day (0000, 0600, 1200, and 1800, local time) for all of August and September using the NOAA HYSPLIT model. In most communities, only two years were modeled 2015 and 2018, except for Shady Cove, Medford, Ashland, Grants Pass, and Cave Junction where five years (2015, 2016, 2017, 2018, and 2019) were used, and in addition to August and September, included the period of July 15-31st. More details about the modeling can be found in this journal article: https://www.publish.csiro.au/wf/WF22071
Copyright Text: Region 6 United States Forest Service
Spatial Reference: 102100 (3857)
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