In just a few seconds, a spark can turn a forest into a rapidly spreading inferno of intense heat and suffocating smoke. Firefighters try to control the wildfire—a battle that might last for months. Water can be used to fight wildfires, but too much water can cause deadly floods. Floods reduce land to swamp and sweep away houses and bridges. In their wake, they leave food shortages, contaminated drinking water, and diseases like cholera and typhus. Follow the scorched trail of the worst wildfires ever, learn what causes flash floods, and discover the technology that helps predict these devastating disasters.