They are found mostly in the western oceans in their intertropical area. They happen mostly during the late summer(September in the Northern Hemisphere and February / March in the South). In the North Atlantic hurricane season runs from July to November; Hurricanes number may change from year to year. We always give them a female name…
1)Origin
The first stage is the tropical LPS, it requires several points to establish. Sea's temperature should be more than 26 ° C on a depth of 50 meters at least, there must be a low pressure area on the surface. a weak altitude area of high pressure should be there, and the variation of wind between the surface and the altitude must be weak. Hurricane works like a chimney which inhales air from the surface to the high levels, this chimney must not be “cut” by too strong winds along its length. The Coriolis force must be strong enough(below 5 ° of latitude there are less chances to meet a cyclone).
2)How it works
Outskirts air is inhaled to the center of the tropical LPS and move like a spiral with Coriolis(in the northern hemisphere anticlockwise). Close to the ground winds come from all directions and rise, this place is the eye's wall of the hurricane where it is the most violent(into the center it's quiet). Hurricanes, even if they recall the shape of our LPS in temperate areas are different. They are smaller(500 to 1000km in diameter)and they move slower(5 to 15 knots roughly). The diameter of the eye is about fifty kilometers. This phenomenon can not occur on land or cold seas.
3)Some tricks
The dangerous zone during hurricane season is the area with the radius of 24 travel times of the hurricane. You can also divide hurricane in two parts(dangerous semicircle where the wind speed is in addition to the hurricane's wind, and the other half-circle):
Hurricanes are classified according to the Saffir-Simpson's scale in 5 steps, hurricane's intensity may grow from 64 knots(only!)in step 1 to at least 136 knots(guys open the Bible and good luck!)in step 5.