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The oceans and the atmosphere convey around the globe the energy and react to climate dynamics. This is not regular and more there are seasons. The positions and extent of depressions and anticyclones and therefore the movement of hot and cold air, the weather can be extreme and surprise people. Living beings can suffer the vagaries of the weather : droughts and floods, warm and cold temperatures, thunderstorms, storms and blizzards, tornadoes and hurricanes ...

Comparison of meteorological risks by year

Countries	violent storms	Tornadoes	Violent winter storms	tropical hurricanes cyclones typhoons	undergoes floods
Germany	100	<10	10	0	10
Australia	500	<100	0	10	100
Canada	1 000	80	20	2	40
China	10 000	<10	5	20	500
United States	10 000	1 000	10	10	1 000
France	100	<10	10	0	10
Japan	500	<10	10	10	50
United Kingdom	100	10	10	0	10

This table shows the approximate number of severe
weather phenomena recorded annually in different countries

Data provided by NOAA (National Oceanic & Atmosphere
Administration) and the NWS (National Weather Service)