Storm Index Forecast

Storm Index is a special index for predicting the possibility of storms during the upcoming forecast period. The Storm index uses Lifted Index, Severe Index, Convection Index and Dewpoint in determining the index. A Storm Index value of 1-3 indicates an increasing possibilty for storms, and a value above 3 indicates a strong likelihood they will develop. The Severe Index indicates the forecasted severity of the storm. A Severe Index value of 4-5 indicates a likely thunderstorm. Severe Index values of 5 or greater indicate a thunderstorm that is possibly severe.