What is a derecho, and why is it so destructive?
In the right conditions, walls of wind made up of several thunderstorms can blow across hundreds of miles in just hours.
Derechos may not be as well known as hurricanes or tornadoes, but these rare storms can be just as powerful and destructive. Primarily seen in late spring and summer in the central and eastern United States, derechos produce walls of strong wind that streak across the landscape, leaving hundreds of miles of damage in their wake. On August 10, 2020, a derecho swept across the Midwest from South Dakota to Ohio, traveling 770 miles in 14 hours and knocking out power for more than a million people.
The term derecho—which means “straight ahead” in Spanish—was coined in 1888 by Gustavus Hinrichs, a physics professor at the University of Iowa who sought to distinguish these straight-moving winds from the swirling