Derecho Resources

Derecho, which is Spanish for "straight" is a wind storm that is associated with a band of rapidly moving thunderstorms that travel in a straight horizontal line. Derechos form due to the combination of low-level warm air advection and rich low-level moisture. They normally take on a bowing shape due to the strong rear in flow of wind, and have hurricane-like attributes such as having gusts greater than or equal to 60 mph, and affecting greater than a 240 mile radius. These "land hurricanes" also can lead to hail, flooding, and isolated tornadoes, but maybe the most alarming attribute of a derecho is that the storm often hits at night. Because people are unable to see, or sometimes even hear the storm nearing, derechos can arrive undetected. In these situations, it is important to constantly check the radio or television, and listen closely for neighborhood weather sirens.
 

 Derecho Preparedness

 
‚ÄčWhat Defines a "Particularly Dangerous Situation"?
A Particularly Dangerous Situation, or PSD, is a term normally used when long-lived, strong and violent tornadoes are possible. A PSD also can occur during a severe thunderstorm.  Find out why derechos can be so dangerous.
 
Facts About Derechos
The National Weather Service offers an indepth view of derechos, including: how they are formed, its strength
and damage risks, as well as explains the different derecho types.
 
What is a Derecho?
Meteorology 101: Step into the Weather Channel classroom and learn what a derecho is, the history of past derechos and what to expect from a derecho.
 
Derecho: "The Land Hurricane"
Strong winds, torrentiall rain, thunder and lightning - just how similar are derechos to hurricanes?
 
Survival & Emergency Preparedness: Mid-Atlantic Derecho
Ten useful tips to be prepared not only for derechos, but for any type of violent weather.