Spring storms sweep across the southern United States

Spring has a tendency to produce volatile weather across many parts of the world, and none more so than the southern United States , as every year severe thunderstorms leave a trail of damage. This week is no exception, as a line of severe thunderstorms work their way across Texas, Louisiana and Oklahoma in the Central Plains to Alabama and Georgia in the southeast, producing flooding rains, damaging hail and tornadoes. Thunderstorms are most likely in the spring and summer months, generally during the afternoon and evening hours with the heating of the day, but they can occur year-round and at all hours. Worldwide, there are an estimated 16 million thunderstorms each year and at any given moment, there are roughly 2,000 thunderstorms taking place. There are about 100,000 thunderstorms each year in the US alone and about 10 percent of them reach severe levels. A thunderstorm is classified as "severe" when it contains one or more of the following: hail 25mm or grea...