Extreme heat is considered the deadliest weather-related hazard in the U.S., according to the Fifth National Climate Assessment. About 2,000 Americans die each year on average from extreme heat, ...

Unstable air that is hot and humid is supportive of derecho formation. Derechos can happen any time of year, but July and early August are the prime time for this type of extreme weather, said Izzi.

Find out what derechos are, how they form, where they occur in the US, their similarities to tornadoes, and vital safety tips to stay protected.