Found in the 2009, 2012, and 2015 editions of the International Residential Code (IRC) and the International Building Code (IBC), ICC 500 dictates that a storm shelter should be built in certain buildings such as: 911 call stations, emergency operation centers, fire, rescue, and ambulance satiations, police stations, and K-12 school buildings with 50 or more occupants. Storm shelters should be built in these types of buildings if they are located in areas where the wind speed reaches up to 250 mph. Most of these locations are found in the southeast and the central United States where the wind speeds and frequency of tornadoes are high.