A tornado is a narrow, violently rotating column of air that extends from a thunderstorm to the ground. Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes can be among the most violent phenomena of all atmospheric storms we experience. According to the Federal Emergency Management Agency (FEMA), the Midwest and the Southeast--which includes parts of Texas--have a greater risk of tornadoes.