Air Quality Update -- September 10, 2013
Incident: Rim Fire Wildfire
Yesterday September 9 2013
The Rim Fire burned approximately 1 700 acres mostly within the containment lines. It is currently 254 685 acres. Light westerly transport winds pushed smoke toward the Sierra crest where it met east to northeasterly flows from the Great Basin. This kept the smoke from the Rim fire trapped on the west slope of the Sierras until evening when easterly winds again carried it downslope into the foothills and San Joaquin Valley.
Tuesday September 10 2013
Easterly winds pushed smoke from the Rim fire into the San Joaquin Valley overnight. Light morning smoke is spread throughout the region as far south as Bakersfield with the heaviest impacts in Groveland Greeley Hill El Portal and Tuolumne Meadows. As the inversion breaks and smoke begins to mix into the atmosphere foothill and San Joaquin Valley communities are likely see impacts increase for a few hours before clearing this afternoon. General smoky haze is likely for most of the day. Transport winds will remain light westerly to west-southwesterly through the day causing smoke impacts similar to yesterday with the possibility for slight improvement south of the fire and some light smoke returning to areas north of the fire. Easterly winds will return slightly weaker tonight bringing nighttime and early morning impacts similar to today for the Yosemite and San Joaquin Valley region.
Wednesday September 11 2013
Morning impacts will be similar to the past two days for the Yosemite and San Joaquin Valleys and impacts are predicted to extend further north into the Sacramento Valley and foothills as well. Westerly transport winds may increase a little clearing smoke a little better from the central valley and foothills. Markleeville Bear Valley and Pinecrest could begin to see light smoke impacts once again. Nighttime easterlies will be weaker with moderate inversions causing slightly less impact to the San Joaquin but similar impacts to the Yosemite region and foothills.
Long term Outlook
Conditions remain similar through the rest of the week with morning impacts maybe a bit less in the San Joaquin Valley as nighttime downslope winds are predicted to be lighter. Daytime transport winds remain westerly and strengthen a bit providing a little better clearing west of the fire. By the weekend high pressure rebounds daytime transport winds weaken and nighttime easterlies once again strengthen but reduced smoke production should moderate air quality impacts from the Rim fire by then.
Follow the links in the following table to view real-time air quality monitoring data for each site.