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Bootleg Fire now third-largest wildfire in Oregon history. Here's what we know

The fire, burning in Southern Oregon, has grown to 399,359 acres, moving past the 2014 Buzzard Complex Fire to become the state's third-largest wildfire.

KLAMATH COUNTY, Ore. — In just over two weeks, Southern Oregon's Bootleg Fire has become the third-largest wildfire in state history.

Officials say the fire was caused by lightning on July 6.

As of Friday, July 22, the fire has already burned 400,389 acres, which translates to nearly 626 square miles  — an area larger than the city of Los Angeles. The fire is 40% contained and has more than 2,300 personnel working to get it under control.

These are four largest wildfires in the state's history:

  • Long Draw Fire burned more than 550,000 acres in Southeast Oregon in 2012
  • Biscuit Fire burned more than 500,000 acres in Southern Oregon in 2002
  • Bootleg Fire has burned 400,389 acres in Southern Oregon this year
  • Buzzard Complex Fire burned 395,747 acres in Eastern Oregon in 2014

Fire officials said 67 homes and 117 minor structures have been destroyed. A large but rural area is under Level 3 "go now" evacuation orders. Click here to see an evacuation map.

RELATED: Latest updates on wildfires burning in Oregon, Southern Washington

The fire burned an estimated 3,000 acres on July 7, the day after lightning started the fire in the Fremont-Winema National Forest, northeast of Klamath Falls. It quickly ballooned in the first week, doubling in size multiple days in a row.

By its fifth day, it had already burned more than 143,000 acres (224.4 square miles), nearly the size of Chicago.

A little over a week after it started, fire officials said the Bootleg Fire was showing extreme behavior that was actually changing the weather around it, making it too dangerous to attack at times. 

"It's changing the direction of the winds. It's creating its own clouds. It's creating lightning," said Marcus Kauffman, spokesman for Incident Command Team 1. 

RELATED: 'It's actually changing the weather': Bootleg Fire's 'extreme' behavior briefly forces firefighters to retreat

KGW Chief Meteorologist Matt Zaffino noted that Oregon's four largest wildfires on record have all occurred within the last two decades. He said part of the reason for that has to do with climate change. 

"We need to adapt our fire strategies as climate change is contributing to bigger fires and a longer fire season," he said, adding that about 80% of wildfires in Oregon are human-caused. 

But there are other elements at play as well, and it has to do with past efforts to prevent forest fires. 

"In the past, frequent, low intensity fires were the rule," Zaffino said. "Now our fires tend to burn hotter because they have more fuel to work with, in some cases because of past fire suppression practices that allowed for woody debris to build up over decades."

Here's a breakdown of how the much the Bootleg Fire has grown each day: 

July 7 - 3,000 acres (4.7 square miles)

July 8 - 16,814 acres (26.3 square miles)

July 9 - 38,892 acres (60.8 square miles)

July 10 - 76,897 acres (120.2 square miles)

July 11 - 143,607 acres (224.4 square miles)

July 12 - 150,812 acres (235.6 square miles)

July 13 - 201,923 acres (315.5 square miles)

July 14 - 212,377 acres (331.8 square miles)

July 15 - 227,234 acres (355.1 square miles)

July 16 - 241,497  acres (377.3 square miles)

July 17 - 281,208 acres (439.4 square miles)

July 18 - 298,662 acres (466.7 square miles) 

July 19 - 303,791 acres (474.7 square miles)

July 20 - 388,359 acres (606.8 square miles)

July 21 - 394,407 acres (616.3 square miles)

July 22 - 399,359 acres (623.9 square miles)

Day to day, the growth of the fire has ranged from a few thousand acres to tens of thousands of acres. On Tuesday, July 20, it jumped from nearly 304,000 acres to more than 388,000 acres — the largest single day of growth the fire has seen.

More coverage of Oregon's wildfires from KGW: