Tornado Picture (IMAGE) Columbia Climate School Caption The small size and complexity of tornadoes makes forecasting difficult. In 2008, a tornado hit Willmar, Minn., with barely any warning. Credit Steve Molenaar Usage Restrictions Credit required License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.