Moderate PM2.5 levels were good in most of the country except in in the Southeast, Mississippi Valley and California as the levels recorded by EPA where moderate (top left). Fires in Canada continue taking place, as reported by HMS; several areas of light to moderate density smoke are visible extending from central to eastern Canada. Moderate density smoke is visible in Nunavut, Ontario, Hudson Bay, and Quebec. Lighter smoke is visible in Manitoba, Ontario, Hudson Bay, and Nunavut. This remnant smoke originates from the wildfires burning in NW Territories, Saskatchewan, and British Columbia. Also, a large plume of moderate density smoke is visible moving eastward from a cluster of wildfires located in eastern British Columbia, Canada. The smoke is seen moving into Alberta and Saskatchewan, where it dissipates into lighter density smoke (top right). In the US, a large plume of moderate density smoke is visible moving NE from a cluster of wildfires located in northern California. Moderate density smoke is visible in northern California and Oregon, dissipating into lighter smoke in eastern Oregon into Idaho (top right). Moreover, a large area of unknown aerosols is seen extending through the central US across the boundary of GOES-WEST imagery. Areas affected include: Texas, Oklahoma, Kansas, and Arkansas, with denser quantities seen in Missouri and Illinois. Aerosol Optical Depth retrieved by MODIS shows the presence of this unknown aerosol in areas aforementioned (bottom).
Special Feature: Fires in California
With most of California in the grips of an unusually severe drought, the state's fire management authorities are prepared for the worst. The state's forests and grasslands are parched and primed to burn. All it would take is one stray cigarette or lightning strike--combined with strong winds and hot weather--to unleash a blaze so large or damaging that it ends up in the record books. And yet, so far, the 2014 season has been surprisingly free of such headline-grabbing fires.
Californians have certainly seen plenty of fire in 2014. A total of 4,172 fires have burned 83,282 acres (33,703 hectares) since the beginning of the year--far more than usual. For comparison, during the previous five seasons, an average of 3,198 fires burned 57,444 acres (23,247 hectares) by mid-August, according to California Department of Forestry and Fire Protection statistics.
But none of the 2014 blazes have grown to be particularly large or destructive. California's list of largest firesincludes several blazes that destroyed more than 250,000 acres (100,000 hectares), such as the Rim Fire in 2013, the Rush Fire in 2012, and the Cedar Fire in 2003. The largest in 2014 has been the Bald fire in Lassen National Forest, which charred about 40,000 acres (16,000 hectares). In 2014, several fires have destroyed structures here and there, but none have devastated entire neighborhoods. The state's historical list of most damaging firesincludes events that destroyed 1,000 structures or more.
The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite captured this image (bottom) of wildfire activity in California on August 24, 2014. Red outlines indicate hot spots where MODIS detected unusually warm surface temperatures associated with fires. The Happy Camp Complex, Man Fire and July Complex are visible in northern California. Most of the large fires have been in northern California, while central and southern California have been largely free of fire to date. (Courtesy: Earth Observatory)
Today's residual layer is shown in the today's lidar timeseries. The airmass associated with this residual layer come from locations north from Baltimore as discussed in yesterdays blog post. The boundary layer rose from 1.0 to 1.4 km during the daylight hours.