how are hurricanes formed ?

Answer 1

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. 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. 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.

Answer 2

Hurricanes begin with intense convection of water over warm(above 26.5 degree celcius) seas.As the storm begins to spin,set in motion by the coriolis effect,the wind strengthens.When wind speed reaches 74 mph,the storm is classified as hurricane.Hurricanes can only form in areas more than 10 degree latitude from the equator,where the coriolis force begins to have influence.Hurricane derives its energy from the latent heat of condensation of the ascending moist air.

Answer 3

here is a site that tells u the exact way a hurricane is formed
i hope this helps
http://www.infoplease.com/ce6/weather/A0858707.html