How to Know a Derecho

A Derecho (pronounced da-ray-cho) is like a tornado, but instead of the winds going in a circle they go straight. They can reach speeds up to 130 mph and can be 250 miles wide and 800 miles long. Derecho season runs from May to August and are most common in July.

Difficulty: Moderately Easy

Instructions

1. 
    

   Derechos can occur suddenly as dark clouds travel very quickly. What you think is a squall can actually be a Derecho, and unlike a tornado that goes by quickly, a Derecho can be 800 miles long. It will take it a long time to pass because it is so long.

2. Before a Derecho starts the atmosphere may appear dead or still. Keep watch and if you see a storm rising in the distance and the wind picking up to 60 mph it may be a Derecho. As the dark clouds rush in, you may confuse it with a thunderstorm or a tornado, so pay attention to how the wind is blowing.

3. People who are outdoors are the most at risk. The winds can cause tree branches to fall or tip over a boat that you are in. Power poles can come down and hit your vehicle and if the winds are strong enough can take shingles off of house roofs.

4. If you are on in a small boat it will be necessary to get to shore immediately. Your chances are very slim that you will be able to ride out the storm.

5. If you are in a mobile home get in the bathtub or under a table and protect your head. There is a possibility that your roof may get torn off because the wind is so strong.

[zahzel]

on 5/18/2009 Good article. Z

[pblanch]

on 5/17/2009 We don't have Derechos in Michigan, we have blizzards. But I leaned something today!

[Mitestarossa]

on 5/14/2009 Excellent storm advice.