Dust devils are Whirlwinds that are made of dust and have wind speeds between 15 and 160 mph ,paths may range 10 feet long to 1 mile long, path withs are between 3 feet wide to 300 feet wide and may last a few seconds to 20 minuets . All thought most dust devils are at the low end of the Dust devil scale on rare ocasons dust devils can case damge fimiliar to a F2 or F3 on the Fujita scale .