A house burns at the Cocos fire in San Marcos, Calif., Thursday. Fire agencies are girding for what is already proving to be a dangerous year of wildfires, as California suffers an extreme drought. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

An image shot by NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua satellite on Wednesday. It shows multiple wildfires in Calif. trailing smoke into the Pacific Ocean. Lynn Jenner/NASA/Goddard hide caption

itoggle caption Lynn Jenner/NASA/Goddard

Residents photograph the burning ruins of their home in Carlsbad, Calif., that was destroyed in the Poinsettia fire, one of nine wildfires that have erupted in San Diego County. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

A charred tree rests on the forest floor after being sawn down to a stump Friday. Firefighters are still working to contain the Rim Fire, which is now the third-largest wildfire in California's history. Mike McMillan/U.S. Forest Service hide caption

itoggle caption Mike McMillan/U.S. Forest Service

A charred caution sign just outside of California's Yosemite National Park. David McNew /Reuters/Landov hide caption

itoggle caption David McNew /Reuters/Landov