Tornadoes 27
Tornadoes 27 : These natural hazards are commonly described as violently rotating columns of air that are in contact with both the ground and an upper atmosphere cumulonimbus cloud. Tornadoes can reach wind speeds of up to 510 km/h and are known to be particularly destructive in terms of property, structures and the natural environment. One of the worst tornado incidents to strike the US occurred in 1925 and largely affected three states (Montana, Illinois and Indiana). No less than 689 people lost their lives, more than 2 000 were injured and the damages reached a shocking $16,5 million (for 1925!). (See article: "Extreme weather conditions")
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