How and what causes hurricanes? (example hurrican dean)?

Question

What caaused hurricane dean?

Answer 1

Converging Winds Create Hurricanes
Converging winds near the surface of the water collide, pushing more water vapor upward, increasing the circulation of warm air, and accelerating the speed of the wind. At the same time, strong winds blowing steadily at higher altitudes pull the rising warm air away from the storm’s center and send it swirling into the hurricane’s classic cyclone pattern.

High-pressure air at high altitudes, usually above 30,000 feet (9,000 meters), also pull heat away from the storm’s center and cool the rising air. As high-pressure air is drawn into the low-pressure center of the storm, the speed of the wind continues to increase.

As the storm builds from thunderstorm to hurricane, it passes through three distinct stages based on wind speed:
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Answer 2

Dear Australia,

You have asked a very good question. The heat energy from the ocean surface and water vapor are essential elements in the genesis and sustenance of tropical storms. What we first see in the development of such storms are large unorganized areas of convective clouds which I have termed Convective Cloud Clusters. These are the incipient areas of storm development. The first thing we need to see for a storm to become organized is surface temperatures of at least 28C. This encourages large scale air flow into this region. As clouds then begin to grow, water vapor is condensed due to the lower pressure aloft and this releases a considerable amount of heat energy into the atmosphere and as long as there is no mechanism aloft such as strong shear which can remove this heat the surface pressure will begin to drop as this heat is added to the air. At this point another very important ingredient is necessary and that is southwesterly winds to the south of the cloud cluster which is embedded in the trade winds (easterlies). This wind structure leads to a counterclockwise or cyclonic circulation which brings surface air filled with water vapor toward a developing center of low pressure and circulation. This air then rises in the convective clouds and further supports the development of low pressure. Soon the cluster becomes a tropical depression, the first real stage in tropical storm life cycle. It is numbered at this point and aircraft flights are made into the depression for close up measurements by dropsonde instruments to record temperature and pressure down to the surface. The initial discovery of the storm is generally done by satellite data interpretation, but satellite data will be closely monitored throughout the life cycle of this storm. As the storm develops it next becomes a tropical cyclone and is now given a name. It may also develop an eye (about 25% do at this point in their history). The final stage of the storm is the hurricane. Throughout the life of this storm water vapor is "the" source of energy that is crucial to its life cycle so that when the storm finally moves over land and that energy source is cut off, the storm immediately begins to dissipate. The major damage from hurricanes is the surge or wall of water which precedes the arrival of the storm. This causes flooding especially if it coincides with high tides. Secondly there are high winds of course which generate flying objects. There are also severe thunderstorms with lightning and quite possibly a tornado. You should always listen to the authorities and evacuate if requested or ordered to. It is a good policy to be as far away from an arriving hurricane as possible. Hope this helps and if not then let me know.

Answer 3

The favourable conditions for the hurricanes to develop are as follows:
(a)Warm ocean surface(atleast 26.5 degree celcius)upto a depth of atleast 50 metres.(b)Steep lapse rate(decrease of temperature with height).That means the atmosphere over the place should be unstable.(c) warm,moist air upto a height of atleast 5 Kms.(d) A minimum distance of 600 Kms from the equator so that coriolis force can deflect the wind(e)A pre-existing disturbance near the surface with sufficient vorticity and convergence to trigger the development and (f) Absence of vertical wind shear(sudden change of wind direction with height.The energy of the hurricane is derived from the latent heat of condensation of the ascending moist air.Hence when they cross the shore ,the moisture source is cut off and the storm weakens.