Lightning-sparked wildfires burned across more than 50,000 acres of northern Nevada on Monday, closing Interstate 80 for a second day, forcing evacuations in some rural areas and even claiming most of the training grounds at a state fire academy.

At least a half-dozen new fires were spotted around the Reno and Carson City area after another round of thunderstorms packing lightning rolled through the area Monday.

In Arizona, a 58,300-acre wildfire north of Grand Canyon National Park jumped the only highway leading to the remote North Rim, closing the road and stranding hundreds of tourists and workers. With the fire burning national forest land about 30 miles from the park, officials said no one was in any danger.