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already. >> reporter: tonight, the wildfires ravaging the west creating some of the worst conditions firefighters have ever seen. the beckwourth complex fire north of lake tahoe exploding. swirling winds forcing these firefighters to run to their truck for shelter. and nearly 90,000 acres and out of control, it's the largest fire burning in the state. >> if it jumps the fire line, we're going to skedaddle out of here. >> reporter: and it's the second fire to ravage the town of doyle in just the last eight months. >> i'm still kind of numb, i mean, after losing everything that i worked for and everything all these years -- it's gone. >> reporter: in mariposa county, the river fire growing by 4,000 acres in just seven hours overnight. now threatening a critical route into yosemite national park and forcing residents to flee. >> i hope everything is still there when i get back. >> reporter: the fires driven by the third record-breaking heat wave in less than a month. tonight, there are nearly 50 burning in six western states.