For the first time since we’ve been keeping track, two separate Category 4 hurricanes struck the mainland U.S. in the same year. It should come as no surprise, then, that the combined recovery cost of Hurricanes Harvey and Irma is expected to set a new all-time high for natural disasters. AccuWeather estimates the total economic impact to top out at a whopping $290 billion, or 1.5 percent of national GDP.