A rapidly growing wildfire south of Lake Tahoe jumped a highway, prompting more evacuation orders and the cancellation of an extreme bike ride through the Sierra Nevada on Saturday as critically dangerous wildfire weather loomed in the coming days.

The Tamarack Fire, which was sparked by lightning on July 4, exploded overnight to at least 26 square kilometers (10 square miles) and was threatening Markleeville, a small town close to the California-Nevada state line. It has destroyed at least three structures, authorities said, and was burning toward the Alpine County Airport after jumping a highway.

A notice posted on the 165-kilometer (103-mile) Death Ride’s website said several communities in the area had been evacuated and ordered all riders to clear the area. The fire left thousands of bikers and spectators stranded in the small town, racing to get out.

Kelli Pennington and her family were camping near the town Friday so her husband could participate in his ninth ride when they were told to leave. They had been watching smoke develop over the course of the day but were caught off guard by the fire’s quick spread.

“It happened so fast,” Pennington said. “We left our tents, hammock and some food, but we got most of our things, shoved our two kids in the car and left.”

Saturday’s ride was supposed to mark the 40th Death Ride, which attracts thousands of cyclists to the region each year to ride through three mountain passes in the so-called California Alps. It was canceled last year during the coronavirus outbreak.

Afternoon winds blowing at 32 to 48 kph (20 to 30 mph) fanned the flames as they chewed through bone-dry timber and brush. Meteorologists predicted critically dangerous fire weather through at least Monday in both California and southern Oregon, where the largest wildfire in the U.S. continued to race through bone-dry forests.

The Bootleg Fire grew significantly overnight Saturday as dry, windy conditions took hold in the area, but containment of the inferno more than tripled as firefighters began to gain more control along its western flank. The fire was still burning rapidly and dangerously along its southern and eastern flanks, however, and authorities expanded evacuations in a largely rural area of lakes and wildlife refuges.

Larger than NYC

The fire grew to 1,137 square kilometers (439 square miles) in size, or more than 259 square kilometers (100 square miles) larger than the area of New York City.

“This fire is large and moving so fast, every day it progresses four to five miles,” said Incident Commander Joe Hassel. “One of the many challenges that our firefighters face every day is working in new country that can present new hazards all the time.”

Extremely dry conditions and heat waves tied to climate change are making wildfires harder to fight. Climate change has made the West much warmer and drier in the past 30 years and will continue to make weather more extreme and wildfires more frequent and destructive, experts say.

In southern Oregon, fire crews are dealing with dangerous and extreme fire conditions, including massive “fire clouds” that rise up to 10 kilometers (six miles) above the blaze. The Bootleg Fire has destroyed at least 67 homes and 117 outbuildings.

The conflagration has forced 2,000 people to evacuate and is threatening 5,000 buildings, including homes and smaller structures in a rural area just north of the California border.

The National Weather Service warned of possible thunderstorms stretching from the California coast to northern Montana on Sunday and said that “new lightning ignitions” were likely because of extremely dry fuels across the West.

Firefighters said in July that they were facing conditions more typical of late summer or fall.

The fires were just two of numerous fires burning across the drought-stricken U.S. West, as new fires popped up or grew rapidly in Oregon and California.

70 blazes

There were 70 active large fires and complexes of multiple fires that have burned nearly 4,297 square kilometers (1,659 square miles) in the U.S., the National Interagency Fire Center said. The U.S. Forest Service said at least 16 major fires were burning in the Pacific Northwest alone.

A fire in the mountains of northeast Oregon was also growing rapidly and was 44 square kilometers (17 square miles) in size Saturday. The Elbow Creek fire started Thursday and has prompted evacuations in several small, rural communities around the Grande Ronde River about 50 kilometers (30 miles) southeast of Walla Walla, Washington.

Oregon Governor Kate Brown invoked the Emergency Conflagration Act to mobilize more firefighters and equipment to help fight that fire.

The Dixie Fire in California, near the 2018 site of the deadliest fire in the U.S. in recent memory, was 5% contained and covered 39 square miles Saturday. The fire was in the Feather River Canyon, northeast of the town of Paradise, California, and survivors of that horrific fire that killed 85 people watched warily as the new blaze burned.

“We’re prepared,” said Mike Garappo, a retired military veteran. “We’ve dealt with fires living in the mountains forever. We know there’s a chance it may not hit here, but we’re ready to go in case.”

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