a tornado no obvious funnel upper clouds, although rotating dust cloud indicates strong winds @ surface. a tornado operates rotating, funnel-shaped cloud extends downward thunderstorm, ground, swirling winds have reached 300 miles per hour (480 km/h). wind speed might difficult imagine: traveling length of u.s. football field within 1 second (over 130 meters or 430 feet per second). damage paths have been in excess of one-mile wide (1.6 km) , 50 miles long (80 km). not tornadoes seen. tornado funnel can transparent until reaching area loose dirt , debris. also, tornadoes have been seen against sunlit areas, rain or nearby low-hanging clouds has obscured other tornadoes. occasionally, tornadoes have developed suddenly, rapidly, little, if any, advance warning possible. before tornado strikes area, wind has been known die down , air become still. cloud of debris has marked bottom of tornado when funnel not visible. tornadoes typically occur along trailing edge of thundersto...
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