Tornado Alert - Disaster Alert Author:Wendy Scavuzzo Ages 7 to 14 years. Tornadoes cause devastation wherever they touch down. Tornado Alert! is a breathtaking journey into the centre of these unpredictable and violent twisters. Some of the features included are: how supercell thunderstorms form and how they spawn tornadoes; where tornadoes most often occur, including Tornado Alley in the United S... more »tates; how to stay safe during a tornado, no matter where you are.« less