Derechos are very powerful windstorms. They appear as bowed out squall lines and can travel for over 400 miles and produce upwards to 135 MPH Winds. Damaging Winds are the main threat with these, but they can contain large hail and isolated tornadoes.
There are types of Derechoes: Serial (a long bowed out squall line with supercells and many bow echos ex: Memorial Day Weekend 2004, and West Virgina Derecho of 1991, and April 2nd 2006 also produce the most tornadoes along with damaging winds), Progressive (a narrow bow echo or group of small bow echos but can travel for long distances es: July 13th 2004 and May 5th 1996 Derecho. This one we are under the threat is a progressive), and Hybrid( cross between both of them and quite rare Southern Great Lakes Derecho of 1998 and maybe Texas Boaters Derecho of May 1987).
They are dangers to boaters, people in moblie homes, and anyone outside because they can produce hurricane force winds.
There are some links.
http://www.spc.noaa.gov/misc/AbtDerechos/derechofacts.htm#types
http://www.crh.noaa.gov/pah/science/convection/may5/may51.php
Picture is from StormTrack Forums
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