Wildfire in Montana explodes to 21,000 acres as heat wave continues

The historic heat wave in the West is not relenting -- and the heat may be contributing to a massive wildfire that's exploded in size.

The historic heat wave in the West is not relenting -- and the high temperatures may be contributing to a massive wildfire that's exploded in size. Las Vegas hit 116 degrees on Wednesday, breaking a daily record, while Grand Junction, Colorado, reached 105 degrees, an all-time June record. On Thursday, the heat moves into Northern California and the Plains. California residents have been asked to scale down their power usage to prevent a strain on the system, reported San Francisco ABC station KGO.