Officials are warning more Oregon residents should prepare to evacuate as the Bootleg Fire scorches more than 340,000 acres, with a national fire official warning it could take a major weather event to subdue the flames, reported CNN. There are currently 80 large wildfires raging in 13 states across the US, burning more than 1.1 million acres, mostly in western states, according to the National Interagency Fire Center (NIFC). Montana has reported the largest wildfires with 18 & Idaho is close behind with 17, the NIFC said. Nearly 20,000 wildland firefighters and personnel are assigned to the 80 large wildfires currently burning across the United States. After Oregon, the state's with the most acres burned are California, Idaho & then Alaska. Hot temperatures have been making the blaze harder to tackle. Fire spokesperson Katy O'Hara told CNN that weather conditions need to change in order for the fire to be extinguished. Watch the video to know more.