Air Quality Update -- September 11, 2013
Incident: Rim Fire Wildfire
Yesterday September 10 2013
The Rim Fire burned approximately 700 acres about 400 ac within the containment lines. It is currently 255 146 acres. Afternoon thunderstorm activity along the Sierra crest helped to stir up the atmosphere providing some good smoke mixing that reduced air quality impacts throughout the region yesterday and into this morning. All areas saw improvement in their air quality from the previous days.
Wednesday September 11 2013
Light downslope winds overnight carried less smoke than on recent mornings down the Clavey and Tuolumne River Drainages. Smoke impacts in the communities usually affected by morning inversions were lighter today with Pinecrest Columbia Groveland Greeley Hill La Grange El Portal and Mariposa all in the good to moderate AQI ranges. Light smoke will linger in the Yosemite Valley and foothill communities for most of the day. Transport winds will remain light through the day. Diurnal upslope/upcanyon flows will be the dominant winds. A slightly better chance of thunderstorms over the Sierras today could again help smoke mix into the upper atmosphere improving air quality conditions on the surface.Eastly winds will remain fairly weak tonight bringing nighttime and early morning impacts similar to this morning for the Yosemite and San Joaquin Valley foothill region.
Thursday September 12 2013
Not much changes from today as we go into Thursday. Similar morning impacts can be expected in areas where the inversion will cause smoke to settle. Afternoon thunderstorm chances are lower than for Wednesday but still possible. Transport winds may begin to turn a little more northerly late in the day as high pressure begins to rebound over southern and central California. Nighttime easterlies will begin to strengthen over the next couple days but impacts will likely remain about the same for the Yosemite region and San Joaquin Valley foothills.
Long term Outlook
Smoke dispersion conditions will begin to worsen going into the weekend as a high pressure ridge develops to the west. Temperatures increase over the weekend and winds may again become northwesterly with stronger easterly winds developing in the nighttime hours. Air quality impacts may begin to lessen some as the Rim fire nears full containment currently expected on September 20.
Follow the links in the following table to view real-time air quality monitoring data for each site.
see added documentation
Air Quality Index (AQI) ratings are derived based on the recommendations found in Wildfire Smoke: A Guide for Public Health Officials.
For more information visit:
California Smoke Information Blog: http://northcasmoke.blogspot.com/