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1:30 PM PDT MON JUL 21, 2014
Numerous wildfires in various stages of containment extend from central to eastern Oregon.
For updated “Significant Fire” details, visit ODF’s fire blog at or the Northwest Interagency Coordination Center (NWCC) at
A “Significant Fire Potential” map, for ODF protected lands, is available at (
DEQ smoke monitoring sensors are indicating generally good air quality throughout central and eastern Oregon at this time.
Statewide air quality index readings are available at
Wildfire smoke dispersion depends on the stability of the atmosphere as well as wind direction and speed. A stable atmosphere holds smoke to the ground and an unstable atmosphere allows smoke to rise and dissipate. Smoke is typically mixed to higher altitudes during the afternoon, when daytime heating destabilizes the air mass. Conversely, smoke tends to settle near the ground and in drainages during the overnight and early morning hours.
Upper level low is northwest of Vancouver Island and slowly moving toward the state. Clouds are moving through the state from the southwest to northeast. With the heating of the day some thundershowers will start to develop. Mixing levels will be good this afternoon and keep wildfire smoke mostly dispersed. Low-level wind flow is mainly light but favoring southwesterly. This may shift from southwest to west and maybe northwest in some locations later this afternoon. Wind flow lightens overnight and becomes mainly influenced by local terrain.
Upper low moves to just off the coast on Tuesday and inland on Wednesday. This will increase showers and thundershowers and likely reduce fire activity on most of the active fires. However, new fire starts are possible, especially over south central Oregon, where less moisture is likely to occur. Mixing will be mostly good and wind flow mostly S to SW Tuesday then becoming erratic later Tuesday due to thunderstorm development. Expect SW to W flow Wednesday as the low starts to move through. With moisture, good mixing and good wind flow, smoke problems should be minimal.
Upper low moves to the east and weakens Thursday and Friday. Flat upper level ridge moves in to dry and warm the air mass. Expect mixing heights to become quite poor overnight but remain good during the daytime. Wind flow decreases and turns northwesterly on Thursday, light drainage flow overnight, and northerly on Friday. Communities to the south or southeast of fires would likely be most susceptible to impact, although most fires would likely not have much smoke production.
Current weather forecasts from the Portland, Medford, and Pendleton National Weather Service offices are available at:,, and respectively.
This bulletin is also available on the web at
ODF Smoke Management Meteorologist