The Caldor Fire has burned at least 199,632 acres and is just 18% contained as of Tuesday morning. The fire ignited Aug. 14 near Little Mountain between Omo Ranch and Grizzly Flats. 

Strong winds and poor humidity had led to a dramatic increase in fire behavior, Cal Fire said in its Tuesday evening update. But fire crews were able to successfully protect structures including at Heavenly Ski Resort where snow blowers were used to increase humidity in the air. 

Some 491 homes and 12 commercial properties are confirmed destroyed and about 35,000 structures remain threatened. About 59,000 people are under evacuation orders, including 22,000 from South Lake Tahoe.

Click here for a map of the Caldor fire's progression.

Click here for the structure damage map launched by El Dorado County.

Caldor Fire - chair lift Flames surround a chair lift at Sierra-at-Tahoe Resort, a skiing area, during the Caldor fire in Twin Bridges, California, on Aug. 30, 2021. Photo: JOSH EDELSON/AFP via Getty Images

Caldor Fire - Ski Lift Flames surround a chair lift at Sierra-at-Tahoe Resort, a skiing area, during the Caldor fire in Twin Bridges, California on Aug. 29, 2021. Photo: JOSH EDELSON/AFP via Getty Images

California fire - caldor fire -- Echo summit Flames consume multiple homes as the Caldor fire pushes into the Echo Summit area in California on Aug. 30, 2021. Photo: JOSH EDELSON/AFP via Getty Images

Caldor fire- Tragedy Springs Dozer operator Todd McAuliffe monitors flames during the Caldor fire in Tragedy Springs, California, on August 29, 2021. Photo: JOSH EDELSON/AFP via Getty Images

Caldor fire - snow machine A snow machine blows water on a structure at Sierra-at Tahoe ski resort as the Caldor Fire moves through the area on Aug. 30, 2021, in Twin Bridges, California. Photo: Justin Sullivan/Getty Images

Caldor fire - lake tahoe - tragedy springs In this long exposure photograph, fire and smoke push into the Lake Tahoe region during the Caldor fire near Tragedy Springs, California on August 29, 2021. Photo: JOSH EDELSON/AFP via Getty Images

Caldor fire - Meyers A Cal Fire firefighter monitors trees while battling the Caldor Fire on Aug. 31, 2021, in Meyers, California. Photo: Justin Sullivan/Getty Images

Caldor fire- twin bridges Firefighters extinguish hot spots as the Caldor Fire moves through the area on Aug. 30, 2021, near Twin Bridges, California. The fire continues to threaten the South Lake Tahoe area. Photo: Justin Sullivan/Getty Images

Roads out of South lake Tahoe are clogged as thousands of the city's residents heed orders to flee the approaching Caldor Fire Miles-long traffic in South Lake Tahoe during a mass exodus Monday as thousands of residents evacuated the area. Photo: AFP / JOSH EDELSON

Mel Smothers rescued his violin when he was told he had to leave his home near Lake Tahoe Mel Smothers rescued his violin when he was told he had to leave his home near Lake Tahoe Photo: AFP / JOSH EDELSON

Caldor fire - RIVERTON Firefighters refill a water truck while battling spot flare ups from the Caldor Fire on Aug. 19, 2021, in Riverton, California. Photo: Allison Dinner/Getty Images

Caldor fire- GRIZZLY FLATS A partially burnt playground still smolders at Walt Tyler Elementary School on Aug. 18, 2021, in Grizzly Flats, California. Photo: Allison Dinner/Getty Images

Separately, the Dixie Fire, the largest wildfire California, has burned more than 807,000 acres and was 48% contained as of Tuesday.