Thousands of firefighters battling a wildfire in Northern California received some help from the weather Saturday hours after it exploded in size, scorching an area greater than the size of Los Angeles. The blaze was one of several tearing through the western United States and Canada, fueled by wind and heat. Cooler temperatures and an increase in humidity could help slow the Park Fire, the largest this year in California. Its intensity and dramatic spread led fire officials to make unwelcome comparisons to the monstrous Camp Fire, which burned out of control in nearby Paradise in 2018, killing 85 people and torching 11,000 homes. Paradise again was near the danger zone. The entire town was under an evacuation warning, one of several communities in Butte County. Evacuation orders were also issued in Plumas, Tehama and Shasta counties. An evacuation warning calls for people to prepare to evacuate and await instructions, while an evacuation order means to leave immediately. Craig Kielb, a volunteer firefighter joined forces with other firefighters to fight the blaze. He said he had lost his home before in the deadly Camp Fire incident in 2018. "Moved up here because we just love to live in the woods," Kielb said. "Now, in hindsight, I guess I second guess that. But I still will do it again." Billy See, an incident commander with the California Department of Forestry and Fire Protection, or Cal Fire, said at a briefing that the blaze had been advancing 8 square miles (21 square kilometers) per hour since its inception. But there was cautious optimism as weather conditions slowed it in some areas, and firefighters were able to plan and deploy additional personnel. Nearly 2,500 firefighters were battling the blaze, aided by 16 helicopters and numerous air tankers. The Park Fire has scorched 544 square miles (1,409 square kilometers) as of Saturday, with no containment, and was moving to the north and east. It has destroyed 134 structures since igniting Wednesday.