In October 1859, the U.S. military arsenal at Harpers Ferry was the target of an assault by an armed band of abolitionists led by John Brown (1800-59).
A tornado appears as a rotating, funnel-shaped cloud that extends from a thunderstorm to the ground with whirling winds that can reach 300 miles per hour. Damage paths can be in excess of one mile wide and 50 miles long. Some tornadoes are clearly visible, while rain or nearby low-hanging clouds obscure others.t is not uncommon to see clear, sunlit skies behind a tornado. 1  Tornadoes cause an average of 70 fatalities and 1,500 injuries in the U.S. each year. 2  The strongest tornadoes have rotating winds of more than 250 mph.
It is not that simple as tornadoes don't occur at a very regular rate. The U.S. averages about 1200 tornadoes per years which works out to an average of about 3.3 per day. A â¦ ccurate global statistics are not available as many countries do not keep records of tornadoes.It is far from an even distribution, though.he U.S. averages about 1200 tornadoes per years which works out to an average of about 3.3 per day. A â¦ ccurate global statistics are not available as many countries do not keep records of tornadoes. It is far from an even distribution, though.