Hurricane in North America and in the Caribbean,
Typhoon in the South-East Asia,
Willi-willi in the Indian Ocean and in Australia.
On what bases itself one to name a hurricane
The hurricanes carry all of the different first names, like hurricane John, the Andrew hurricane, the Denise hurricane, etc
Several steps were successively adopted to name each hurricane. Very a long time ago, they were named in the honor of the saint of the day. Thereafter, they bore the name of politicians and their wife. One finally arrived from there, in 1979, to draw up a list of first names male and female, English, French and Spanish, in alternation.
The names used return at every 6 years. However, it happens that certain names are withdrawn if he represents a hurricane particularly devastator. It is in particular the case of Frederic in 1979 and Joan in 1988.
The hurricanes can produce several tornadoes at the time of their passage what returns them still more devastators. One could believe that the center (the eye) of the hurricane is an enormous tornado. It is not the case. The eye can reach several tens of kilometers whereas the tornadoes generally do not exceed 1000 meters in diameter.
The preceding graph shows only the average trajectories. Actually, a hurricane can have a trajectory much more irregular.
For the observer, the approach of a hurricane appears by arrived of very thick cirri which invade the sky. The cirri make then place with cirrostratus then altostrati. Then the cumuli congestus giving come downpours. These last are also not distributed around the hurricane. The downpours are presented in the form of bands in the spirals of the hurricane.
the presence of a tropical depression;
vigorous cumuli congestus or cumulonimbus;
moisture in great quantity in troposphere;
regular winds at all the altitudes.
The hurricanes are depressions of almost circular form of rather reduced size (much smaller than an average depression).
The central point of a hurricane is called the eye. In this zone reigns calm the almost flat one (wind of approximately 30 km/h). Close to this center (approximately 40 km) the winds are to their maximum i.e. approximately 270 km/h with gusts going up to 350 km/h.
The origin of the strong winds in the hurricanes is the great difference in pressure.
Between the center and the outside of the hurricane the difference in pressure can be 10 kPa in rare cases but 5 kPa on average.