What is a derecho?

Posted: 11:52 AM EDT Jul 28, 2011

A derecho is a widespread and long-lived windstorm that is associated with a fast-moving band of severe thunderstorms.

They can produce significant damage to property and pose a serious threat life, primarily by downburst winds.

To be classified as a derecho, the path length of the storm has to be at least 280 miles long, but the widths may vary from 50-300 miles.

Derechos are usually not associated with a cold front, but a stationary front.

They occur mostly in July, but can occur at anytime during the spring and summer.