Thousands of homes in Northern California wine country and central Oregon were under evacuation orders and warnings Sunday as firefighting crews battled wildfires in dry, hot weather.

Multiple wildfires have already erupted in parts of the western United States, including in Oregon and California's Napa County.

Two major wildfires in California and Oregon force mass evacuations as firefighters battle blazes amid dangerous heat conditions.

Parts of California, Oregon and Washington state will experience extreme heat at least through Tuesday, forecasters say.

Red flag warnings now cover parts of Oregon, Washington and California. In Oregon and California, crews are battling flames that are burning thousands of acres. Along the West Coast, heat alerts remain in effect for 11 million people.

More than 6,800 acres of land has burned in northern California from the Pickett Fire, as dry conditions threaten thousands on the West Coast.