A fire near the Grand Canyon National Park in Arizona has grown more than 20 times in size in 24 hours as an intensifying wildfire season sees the return of Canadian wildfire smoke into the U.S.

Strong winds and hot, dry weather continue to fuel two separate wildfires near the northwestern side of the Grand Canyon Saturday, closing the canyon’s North Rim and forcing evacuations throughout the area.

Visitors and staff at two national parks in the U.S. West have been evacuted because of wildfires. Officials at Black Canyon of the Gunnison National Park in Colorado say the park closed Thursday morning after lightning sparked blazes on both rims.

Hundreds of visitors and residents were evacuated from the North Rim of Grand Canyon National Park this week as two wildfires advanced toward the park.

The White Sage Fire near the North Rim of the Grand Canyon has grown to 19,000 acres, prompting evacuations for nearby residents, according to the Bureau of Land Management. As of the morning of July 12, BLM reported the fire had spread to 19,153 acres, with no containment achieved by firefighters.

Authorities increased the size of the evacuation zone for the White Sage Fire north of the Grand Canyon on Friday morning.

A wildfire that's burning in the southern part of Black Canyon of the Gunnison National Park has grown to more than 1,600 acres.