Avalanche Fire, Yosemite Fires - Smoke is really think in Yosemite today. 8/13/11
1st image is on Hwy 140 by the Arch Rock Entrance station taken at 9am, the smoke really settles in the Merced River Canyon in the evening and early morning.
2nd photo is at 9:15 am and is from Hwy 120 looking across the Merced River Canyon over at the fire. You can see how the smoke settles into the canyon.
3rd photo is from Hwy 120 at 10:30 am and shows how the smoke has started to move up the canyon into Yosemite Valley as is the case every day between 11am and about 11pm.