What is a derecho? An atmospheric scientist explains these rare but dangerous storm systems
Monday, June 15, 2020 - 08:30
in Earth & Climate
Thunderstorms are common across North America, especially in warm weather months. About 10% of them become severe, meaning they produce hail 1 inch or greater in diameter, winds gusting in excess of 50 knots (57.5 miles per hour), or a tornado.