Large and heavy forest fires burn the ground, destroy woodland and leave a moonless landscape.

Onshore winds from the west and southwest shifted direction offshore, blowing from the north or northeast, and in Northern California, fire forecasts would be in place by the end of the week, the National Weather Service said.

The Caldor Fire, the nation’s first fire-fighting priority, grew to more than 213 square miles southwest of Lake Tahoe, but containment remained at 12 percent, the California Department of Forestry and Fire Control said.

Smoke discoloured the normally blue skies over the Alpine lake, but pollution levels lowered to “unhealthy,” on Thursday morning, less than 24 hours earlier when they were deemed “hazardous,” by the US Air Quality Index.

Since the early days of the fire that started on August 14 and suddenly exploded destroying the community of Grizzly Flat, the resources dedicated to fighting the blaze have increased to nearly 2.900 firefighters, 21 helicopters, 245 engines, and dozens of bulldozers.

Ongoing assessments of the damage have counted up to 637 homes, businesses and other buildings damaged.

Nationally there were 14 major fires, including one blaze that blew through southern California on Wednesday that has yet to escape the wildfires that have swept through the north throughout the summer.

But after the simulations, and for the first 10 years, this trend reversed and fires began to dwindle in size and frequency.

NOAA Weather Radio

NOAA Weather Radio is an automated 24-hour network of VHF FM weather radio stations in the United States that broadcast weather information directly from a nearby National Weather Service office. (wikipedia)

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Mendocino Complex Fire

The Mendocino Complex Fire was a large complex of wildfires that burned in northern California for more than three months in 2018. It consisted of two wildfires, the River Fire and Ranch Fire, (wikipedia)

National Interagency Fire Center

The National Interagency Fire Center in Boise, Idaho is the physical facility which is the home to the National Interagency Coordination Center , and the National Multi-Agency Coordination group . (wikipedia)

August Complex fire

The August Complex was a massive wildfire that burned in the Coast Range of Northern California, in Glenn, Lake, Mendocino, Tehama, Trinity, and Shasta Counties. (wikipedia)

California Department of Forestry and Fire Protection

The California Department of Forestry and Fire Protection is a fire department of the California Natural Resources Agency in California, United States. (wikipedia)

National Weather Service

The National Weather Service is an agency of the United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, (wikipedia)

Dixie Fire

The Dixie Fire is an active wildfire in Butte, Plumas and Lassen Counties, California. It is named after the road where it started. (wikipedia)