Large wildfires forcing Arizona road closures

New evacuations have been issued for the Mangum Fire in northern Arizona, which has grown to 56,780 acres and is only 3% contained.

The Big Horn Fire near Tucson, where evacuations are still in place, has burned at least 23,892 acres and is 40% contained.

Recent strong winds helped spread the flames, but winds are subsiding now that a huge ridge of high pressure is moving into the Desert Southwest. Unfortunately, it may not rain in the Tucson area for at least another week.

Red flag warnings remain posted in southern Colorado, as well as the Sacramento and San Joaquin valleys of California, where winds will be gusty Thursday and humidity will be extremely low.

Several brush fires broke out Wednesday in northern California around Sacramento, including the Nelson Fire. Three homes were destroyed and two were damaged.

Also near Sacramento, evacuations are in place due to the Walker Fire, which has grown to 1,100 acres and is only 35% contained. It has destroyed two structures and threatened 50. As of Thursday morning, the California Department of Transportation (Caltrans) has not reported any road closures due to the fires.

The good news is that, beginning Thursday night, a new high pressure system will relax the winds where these California fires are burning. However, it will bring more high heat and very dry air to the area, making it more difficult for firefighters to control the wildfires for at least the next few days.