Tonight, California's largest fire so far this year. The park fire exploding in size in just four days. The flames meteoric march rapidly spreading to more than 300,000 acres. Now sprawling over multiple counties. A towering swirling fire NATO seen crossing this road. This home among more than 130 structures so far destroyed and at least 4000 more are threatened. Authorities believe the blaze was sparked by 42 year old Ronnie Dean Stout II spotted pushing a burning cardinal into a ravine. Now arrested on suspicion of arson. Overnight, new evacuations in multiple communities.

The fire department was like, you guys have to get out now. It's coming up and it's coming fast.

Including the entire town of paradise still reeling from the trauma left by the campfire. The deadliest and most destructive wildfire in California history killing 85 people, decimating the area.

Definitely is a lot of PTSD in.

This county and you can see the destruction in its wake. Homes in this area gutted and at its fastest, officials say it was moving at about 5000 acres per hour. Right now, the west is besieged by fire with more than 110 active fires covering nearly 3000 sq. Mi. In Idaho, harrowing video shows residents escaping through a tunnel of flames. In eastern Oregon, the pilot of an airtaker was found dead battling one of several fires consuming the state.

I've lived here all my life. Never, never seen it this way. Never.

And in Alberta, Canada, officials estimate half the historic town of Jasper was destroyed with thousands forced to evacuate. And as you walk through the wreckage here, something you immediately notice is this smell, is this smoke? Officials say poor air quality alerts for the rest of the week across the west.

Lester, thanks for watching. Stay updated about breaking news and top stories on the NBC News app or follow us on social media.