Central Washington Smoke Outlook for 16 Sept 2017

9/15/2017 Air quality forecast for areas near the Eagle Creek fire in the Columbia River Gorge

Click here for a version of the Outlook with live links

One last hurrah for wildfire smoke this weekend

If you haven't heard, fall weather is nearly upon us.  While this means chilly temperatures and saying goodbye to the summer gear, the upside is that fire activity should reduce significantly.  Smoke may linger a bit through the weekend but this should be the last hurrah for wildfire smoke in most locations.

The National Weather Service is issuing an Air Quality Alert for Central and Eastern Washington which will expire on Monday morning.  However, several counties will see relief sooner and NWS will end the AQA early for those locations as conditions improve.  Sunday night and Monday morning will bring rain to Western Washington and other west-facing mountainous areas, but the eastern Cascades probably won't see much more than a sprinkle.

Much of Eastern Washington should expect air quality to vary from Moderate to Unhealthy today, but improve slowly through the weekend.  Winds from the east have been bringing in smoke from BC and Montana fires, which hit Spokane yesterday and will continue to pester residents in Eastern Washington today.  Winds should die down a little on Saturday but expect some smoke to linger potentially through Sunday.  With the chilly temperatures, low mixing heights, and low winds on Saturday, there will be some smoke drainage into valley towns.  Sunday will bring winds from the south and smoke should clear out then for much of Eastern Washington.

Central Washington air is still Unhealthy or worse, especially Klickitat, Kittitas, and Yakima counties.  Hopefully this improves a bit through the weekend as fire activity reduces.  Though, you may have to wait until the end of the weekend to see real relief, especially since smoke will continue to drain into the valleys from local fires.  Some areas in Okanogan and Chelan counties will likely continue to see air that is Unhealthy for Sensitive Groups due to smoke from the Diamond Creek fire.

Clark and Skamania counties will continue to see smoke impacts from the nearby fires in Oregon through today.  Most of the rest of Western Washington shouldn't see any smoke at the ground. Though, there is potential for a couple smoke plumes to pass overhead and potentially impact mountainous areas today as winds continue to blow from the east.

And now for the pretty picture: regional smoke seen this morning by the GOES-16 satellite.  

Central Washington Smoke Outlook 15 Sept 2017

North Central Washington Smoke Outlook

Central Washington smoke under cooler conditions

With the northerly winds over central and eastern Washington today, downwind impacts of wildfire smoke will be of concern.

Of the highest concern are the Upper and Lower Yakima River Valleys, the Methow Valley, and the lower Columbia Basin.  For today, expect downwind communities in the above mentioned valleys to experience Unhealthy for Sensitive Groups to Very Unhealthy for most to today through tomorrow morning.

After the winds die down, we can expect fire growth to have occurred, which means more smoldering, especially as cooler temps prevail.  Wildfire smoke under cool conditions causes the smoke to gather in valleys overnight and will accumulate until the sun heats the air and smoke, lofting the smoke up.

Expect the Colombia Basin, Okanogan, Chelan, Douglas, Kittitas, Yakima and Klickitat Counties will have compromised or diminished air quality once the northerly wind slows down.

Central Washington Smoke Outlook 14 Sept 2017

Is there cleaner air in our future?

This from the National Weather service:

Area Forecast Discussion
  National Weather Service Spokane WA
  453 AM PDT Wed Sep 13 2017
  
  .SYNOPSIS...
  A cold front passage tonight will bring gusty winds and cooler 
  temperatures for the rest of the work week. There is a chance of 
  showers for north Idaho Thursday and Friday. After a chilly start 
  on Saturday, anticipate dry and milder weather. The next chance of
  rain looks to arrive Sunday night into Monday followed by breezy 
  and cooler conditions.


For the Wednesday into Friday communities that are near existing large fires will continue to deal with overnight smoke into their valleys.  Areas such as Winthrop in the Methow valley to the South of the Diamond Creek fire should be aware of this given the forecast for winds out of the North through Thursday.


Western Washington should remain clear of the smoke.
Eastern Washington areas around Spokane and North should also be breathing cleaner air.
Walla Walla is seeing some smoke today from a Central Oregon fire that made a significant run yesterday.
The Methow, Chelan, Wenatchee, Kittitas and Yakima valleys are our areas of concern for the next few days.


There is good news on the horizon.  The trend is for lower temperatures and higher relative humidities across the entire inland Northwest from Friday through the weekend, with a much anticipated, much needed chance of widespread precipitation to support the firefighting efforts by early next week!

Central Washington Smoke Forecast - Tuesday, September 12, 2017

Sunday was the cleanest we've been all month!

Welcome relief from smoke over the weekend! Air quality monitors on Sunday showed the cleanest air we've had all month. Not squeaky clean but a far cry from the gunk we've been inhaling, with most of the state's fine particle monitors registering Good air.


With a mild ridge building today and tomorrow, winds will be light and smoke has already started accumulating in Central Cascades valleys. The previous post below covers these communities. An air quality alert is in effect for Chelan, Douglas, Kittitas, Yakima and Klickitat counties through 10AM Wednesday.

Fortunately the east winds we feared don't seem to be a major concern anymore, meaning:

• Montana smoke is unlikely to hit far eastern WA. Spokane area should hover between Good and Moderate through Tuesday, while the southeastern and northeastern counties should see mostly Good air.
• Smoke from the Cascades is unlikely to make its way to western WA → expect Good air
• A little smoke from the Eagle Creek fire could still make its way toward Cascade Locks and Camas, leading to Moderate/ Unhealthy for Sensitive Groups air. Areas closer to fires might see poorer air. 

Even though the major wildfires continue to burn- albeit with less intensity- decent winds and good mixing on Wednesday will help nudge us toward an all- green (meaning Good air) state.