The Latest on wildfires burning in the Western United States (all times local):

8:30 p.m.

A wildfire that’s threatening 700 homes and buildings in rural Northern California continues to grow explosively as firefighters struggle in rough terrain to contain it.

No homes have burned but the blaze is surging through sparsely populated areas of Yolo and Napa counties about 50 miles (80 kilometers) from the state capitol of Sacramento.

As of Monday night, flames had devoured 60,000 acres of tinder-dry grass, brush and oak. That’s nearly 94 square miles (about 243 square kilometers) — nearly the size of Sacramento.

The so-called County Fire erupted Sunday and at times has grown by 1,000 acres an hour.

Smoke and ash are contributing to poor air quality in the San Francisco Bay Area and California wine country.

Hot, dry conditions are fueling blazes in several states in the U.S. West.

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