A tanker drops fire retardant as the Bobcat Fire burns near Juniper Hills, California, U.S., September 17, 2020. REUTERS/Mario Anzuoni TPX IMAGES OF THE DAY

Firefighters battle a wildfire near a structure while defending the Mount Wilson observatory during the Bobcat Fire in Los Angeles, California, U.S., September 17, 2020. REUTERS/Ringo Chiu

A helicopter flies past a smoldering hillside after dropping water on the Brattain Fire in Paisley, Oregon, U.S., September 17, 2020. REUTERS/Adrees Latif

Nicole West, part of the Hillbilly Brigade of some 1,200 men and women who spontaneously came together to fight fires, stands for a portrait petting her dog Oink on a bulldozer during the aftermath of the Riverside Fire near Molalla, Oregon, U.S., September 16, 2020. Picture taken September 16, 2020. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

Trees lie burning from the Brattain Fire in the Fremont National Forest in the outskirts of Paisley, Oregon, U.S., September 17, 2020. REUTERS/Adrees Latif

A firefighter looks on while defending the Mount Wilson Observatory in the Angeles National Forest during the Bobcat Fire in Los Angeles, California, U.S., September 17, 2020. REUTERS/Ringo Chiu TPX IMAGES OF THE DAY

A tanker drops fire retardant as a house is seen, as the Bobcat Fire burns near Juniper Hills, California, U.S., September 17, 2020. REUTERS/Mario Anzuoni TPX IMAGES OF THE DAY

A wildfire burns in the Angeles National Forest during the Bobcat Fire in Los Angeles, California, U.S., September 17, 2020. REUTERS/Ringo Chiu

Smoke is seen as the Bobcat Fire burns in the Angeles National Forest near Los Angeles, California, U.S., September 17, 2020. REUTERS/Mario Anzuoni

Smoke rises from a wildfire burning in the Angeles National Forest during the Bobcat Fire in Los Angeles, California, U.S., September 17, 2020. REUTERS/Ringo Chiu

Fire retardant is seen after it was dropped on an area, as the Bobcat Fire burns in the Angeles National Forest near Los Angeles, California, U.S., September 17, 2020. REUTERS/Mario Anzuoni TPX IMAGES OF THE DAY

A search and rescue team, including a canine, from Salt Lake City, Utah, look for victims through gutted homes in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 13, 2020. Picture taken with a drone. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

Red fire retardant blankets burned residences and vehicles in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 14, 2020. Picture taken with a drone. REUTERS/Adrees Latif

Red fire retardant blankets burned residences, vehicles and a swimming pool in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 13, 2020. Picture taken with a drone. REUTERS/Adrees Latif

Smoke is seen as the Bobcat Fire burns in the Angeles National Forest near Los Angeles, California, U.S., September 17, 2020. REUTERS/Mario Anzuoni

A firefighter walks down a road in the aftermath of the Riverside fire that ravaged Clackamas County in Estacada, Oregon, U.S., September 15, 2020. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

A farm is leveled by the South Obenchain Fire along Butte Falls Highway in Eagle Point, Oregon, U.S., September 10, 2020. Picture taken with a drone. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

Democratic U.S. vice presidential nominee Senator Kamala Harris and California Governor Gavin Newsom look at a burned home at the site of the Creek Fire in Auberry, California, U.S., September 15, 2020. REUTERS/Lucy Nicholson

Vehicles lie damaged in the aftermath of the Obenchain Fire in Eagle Point, Oregon, U.S., September 11, 2020. Picture taken September 11, 2020. REUTERS/Adrees Latif

Steven Richardson, part of the Hillbilly Brigade of some 1,200 men and women who spontaneously came together to fight fires, works on a hot spot during the aftermath of the Riverside Fire near Molalla, Oregon, U.S., September 16, 2020. Picture taken September 16, 2020. REUTERS/Shannon Stapleton

Fire damaged forest is seen in the aftermath of the Riverside fire that ravaged Clackamas County in Estacada, Oregon, U.S., September 15, 2020. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

Johnny Islas, a firefighter from Las Vegas, monitors embers from a firing operation near the Obenchain Fire in Butte Falls, Oregon, U.S., September 15, 2020. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

Elizabeth Wright of the U.S. Forest Service watches a helicopter as it makes a water drop in the Angeles National Forest during the Bobcat Fire in Los Angeles, California, U.S., September 16, 2020. REUTERS/Patrick T. Fallon TPX IMAGES OF THE DAY

Democratic U.S. vice presidential nominee Senator Kamala Harris meets with California Governor Gavin Newsom at the site of the Creek Fire in Auberry, California, U.S., September 15, 2020. REUTERS/Lucy Nicholson TPX IMAGES OF THE DAY

The Bobcat Fire burns near Mount Wilson Observatory in Los Angeles, California, U.S., September 14, 2020. Picture taken September 14, 2020. REUTERS/Mario Anzuoni

Firefighters watch the Bobcat Fire as they stand next to a backyard pool after an evacuation was ordered for the residents of Arcadia, California, U.S., September 13, 2020. REUTERS/Mario Anzuoni

The remains of a fire damaged hotel sit, in the aftermath of the Beachie Creek fire in Gates, Oregon, U.S., September 14, 2020. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

Downtown San Francisco is seen from Dolores Park under an orange sky darkened by smoke from California wildfires in San Francisco, California, U.S. September 9, 2020. REUTERS/Stephen Lam

Water and food for missing pets are seen on the sidewalk as a couple searches for possessions through the ashes of their gutted home in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 14, 2020. Picture taken with a drone. REUTERS/Adrees Latif

A saved home stands next door to the remains of Sandra Stone's family cabin, which was destroyed by the CZU Lightning Complex fire, in Brookdale, California, U.S., September 15, 2020. REUTERS/Nathan Frandino

Charred debris from the Berry Creek Elementary school is seen after the Bear Fire raged through Berry Creek, California, U.S. September 9, 2020. REUTERS/Fred Greaves

Vehicles lie damaged in the aftermath of the Obenchain Fire in Eagle Point, Oregon, U.S., September 11, 2020. Picture taken September 11, 2020. REUTERS/Adrees Latif

A search and rescue team, surrounded by red fire retardant, look for victims under burned residences and vehicles in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 13, 2020. Picture taken with a drone. REUTERS/Adrees Latif

Flames appear on a hillside during the Elkhorn Fire near Red Bluff, California, U.S. August 31, 2020. Picture taken August 31, 2020. Matthew McFarland/Unified Fire Authority/Handout via REUTERS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY.

A firefighter carries hoses during the Elkhorn Fire near Red Bluff, California, U.S. August 29, 2020. Picture taken August 29, 2020. Matthew McFarland/Unified Fire Authority/Handout via REUTERS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY.

Burnt trees are silhouetted during the Elkhorn Fire near Red Bluff, California, U.S. September 2, 2020. Picture taken September 2, 2020. Matthew McFarland/Unified Fire Authority/Handout via REUTERS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY.

A firefighter walks along a hillside covered with flame retardant during the Elkhorn Fire near Red Bluff, California, U.S. August 29, 2020. Picture taken August 29, 2020. Matthew McFarland/Unified Fire Authority/Handout via REUTERS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY.

A parking lot and drain are seen blanketed by red fire retardant in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 14, 2020. Picture taken with a drone. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

Fire burns on the remains of fire damaged trees as smoke billows in the aftermath of the Beachie Creek fire near Detroit, Oregon, U.S., September 14, 2020. REUTERS/Shannon Stapleton

A search and rescue team from Salt Lake City, Utah, gather to look for victims through gutted homes in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 13, 2020. REUTERS/Adrees Latif

Melted aluminum from the engine of a burnt car is seen after the Bear Fire burned through Berry Creek, California, U.S.September 9, 2020. REUTERS/Fred Greaves

Hansel Valentine, 24, inspects the remains of the burnt down property of her relatives, as the wildfire continues in Estacada, Oregon, U.S., September 13, 2020. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

Bowls containing food and water are seen left by owners for their missing pets amid homes gutted by the Almeda fire in Talent, Oregon, U.S., September 12, 2020. REUTERS/Adrees Latif

A swing and a charred vehicle are seen after the Bear Fire burned through Berry Creek, California, U.S.September 9, 2020. REUTERS/Fred Greaves

The remains of a fire damaged automobile and a motel sit in the aftermath of the Beachie Creek fire in Detroit, Oregon, U.S., September 14, 2020. REUTERS/Shannon Stapleton

A cat is seen walking around a neighbourhood after wildfires destroyed an area of Phoenix, Oregon, U.S., September 10,2020. REUTERS/Carlos Barria

Security officials survey the Bear Lakes Estates neighborhood which was left devastated by the Almeda fire in Phoenix, Oregon, U.S., September 9, 2020. Image taken with a drone. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

Flames from the Bobcat Fire are pictured after an evacuation was ordered for the residents of Arcadia, California, U.S., September 13, 2020. REUTERS/Patrick T. Fallon

Tracy Koa puts her hands together in gratitude as she and her partner David Tanksley arrive to find their home gutted by the Almeda fire in Talent, Oregon, U.S., September 12, 2020. “We lost everything but at least we have our family. Thank God we left when we did,” Koa said. REUTERS/Adrees Latif

A search and rescue team, surrounded by red fire retardant, look for victims under burned residences and vehicles in the aftermath of the Almeda fire in Talent, Oregon, U.S., September 13, 2020. Picture taken with a drone. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

The Webber family searches for belongings through their home, which was gutted by the Almeda fire, in Talent, Oregon, U.S., September 13, 2020. REUTERS/Adrees Latif

Visitors are seen in Dolores Park under an orange sky darkened by smoke from California wildfires in San Francisco, California, U.S. September 9, 2020. REUTERS/Stephen Lam TPX IMAGES OF THE DAY

The remains of Berry Creek Elementary school continue to burn after the Bear Fire raged through Berry Creek, California, U.S. September 9, 2020. REUTERS/Fred Greaves

Dane Valentine, 28, inspects the remains of the burnt down property of his relatives, as the wildfire continues in Estacada, Oregon, U.S., September 13, 2020. REUTERS/Shannon Stapleton

Bryan Alvarez holds a sign for oncoming traffic as utility workers repair power lines in the aftermath of the Obenchain Fire in Eagle Point, Oregon, U.S., September 11, 2020. Picture taken September 11, 2020. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

A man walks through a street in the town where about 10,000 residents were evacuated as the fire continues, in Molalla, Oregon, U.S., September 11, 2020. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

Three years old Ashley looks on her burned bicycle after wildfires destroyed a neighbourhood in Bear Creek, Phoenix, Oregon, U.S., September 10, 2020. REUTERS/Carlos Barria

The Bay Bridge is seen under an orange sky darkened by the smoke from California wildfires in San Francisco, California, U.S., September 9, 2020. REUTERS/Stephen Lam TPX IMAGES OF THE DAY

Houses and vehicles in the Bear Lakes Estates neighborhood which were left devastated by the Almeda fire are seen in Phoenix, Oregon, U.S., September 9, 2020. Picture taken with a drone. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

A man inspects a neighbourhood after wildfires destroyed an area of Phoenix, Oregon, U.S., September 10, 2020. REUTERS/Carlos Barria