The wildfire threatening Yosemite National Park
continues to rage:
The wildfire threatening Yosemite National Park has grown to become California's seventh biggest ever, as firefighters battle to protect San Francisco's main water supply.
The so-called Rim Fire now covers some 184,000 acres (73,000 hectares) -- an area bigger than Chicago -- and was still only 20 percent contained by Tuesday, albeit up from 15 percent a day earlier.
A main road into Yosemite, one of America's top tourist destinations, remains closed as more than 4,081 firefighters battle the flames. The cost of the fire has reached $33 million.
Stunning footage from the cockpit of a California Air National Guard C-130J-30 Hercules as it drops fire retardant on August 22nd:
These images from NASA show the fire encroaching on Yosemite National Park:
To get an understanding of just how quickly a wildfire spreads, watch this incredible video: