how do hurricanes form?

Answer 1

the warmth and moisture of the ocean during late summer and early fall months energizes the pre storm conditions and leads to a thundre storm.

if thunderstorm persist and wind picks up to 40 miles per hour,
the tropical disturbance becomes a tropical storm.

then it gradullay begins to grow and grow forming a deadly hurricane. hurricanes can lead to tsunami on beaches of india or africa.
the hurricane can go on to destroying 160-16782 houses in a year.

Answer 2

Hurricanes usually form over oceans particularly along the inter-tropical convergence zone where the tropical airmasses from the both hemispheres meet.These airmasses are warm and humid and have favourable lapse rates up to great heights.
The important condition required for the formation of the hurricane is warm ocean surface with a surface temperature of atleast 26.5 degree celcius.In such a situation,initially a low pressure develops and winds from the sorrounding areas converge there resulting in a counter clockwise circulation of wind due to coriolis force.The wind lifts the already existing warm and humid air over the low pressure area.As the air is warm,convection also starts(due to buoyancy) and aids the process of lifting the air.This ascending moist air cools as it goes up and condensation of water vapour takes place resulting in the formation of huge rotating mass of clouds including thunder clouds.The addition of moisture by evaporation from the warm sea surface and the subsequent condensation of the moisture at higher levels releases the latent heat of condensation which supplies the required energy to the storm and powers them like giant heat engines.That is why when they cross the shore,this energy source is cut off and the storm weakens.They do not form within 7 degree latitude on both sides of the equator as the coriolis force is very weak here and do not deflect the wind into a whirling motion.

Answer 3

A tropical cyclone's primary energy source is the release of the heat of condensation from water vapor condensing at high altitudes, with solar heating being the initial source for evaporation. Therefore, a tropical cyclone can be visualized as a giant vertical heat engine supported by mechanics driven by physical forces such as the rotation and gravity of the Earth. In another way, tropical cyclones could be viewed as a special type of mesoscale convective complex, which continues to develop over a vast source of relative warmth and moisture. Condensation leads to higher wind speeds, as a tiny fraction of the released energy is converted into mechanical energy;[15] the faster winds and lower pressure associated with them in turn cause increased surface evaporation and thus even more condensation. Much of the released energy drives updrafts that increase the height of the storm clouds, speeding up condensation.[16] This provides the system with enough energy to be self-sufficient and causes a positive feedback loop that continues as long as the tropical cyclone can draw energy from its thermal reservoir, the warm water at the surface of the ocean. Factors such as a continued lack of equilibrium in air mass distribution would also give supporting energy to the cyclone. The rotation of the Earth causes the system to spin, an effect known as the Coriolis effect, giving it a cyclonic characteristic and affecting the trajectory of the storm.

Answer 4

cold air and hot air form together and make a uplift causing the twister like shape.

Answer 5

Some kid in Africa whistling in a western direction. Thats how they start anyway from there they just get bigger.

Answer 6

Ali this is a good question, to Learn More go to http://www.srh.noaa.gov/srh/jetstream/tropics/tc.htm#origin . the hurrican I.E. Tropical Cyclone is a warm-core, low pressure system without any "front" attached, that develops over the tropical or subtropical waters, and has an organized circulation. Depending upon location, tropical cyclones have different names around the world. In the:

Atlantic/Eastern Pacific Oceans - hurricanes
Western Pacific - typhoons
Indian Ocean - cyclones
Regardless of what they are called, there are several favorable environmental conditions that must be in place before a tropical cyclone can form. They are:

Warm ocean waters (at least 80°F / 27°C) throughout a depth of about 150 ft. (46 m).
An atmosphere which cools fast enough with height such that it is potentially unstable to moist convection.
Relatively moist air near the mid-level of the troposphere (16,000 ft. / 4,900 m).
Generally a minimum distance of at least 300 miles (480 km) from the equator.
A pre-existing near-surface disturbance.
Low values (less than about 23 mph / 37 kph) of vertical wind shear between the surface and the upper troposphere. Vertical wind shear is the change in wind speed with height.
Tropical Cyclone Formation Basin
Given that sea surface temperatures need to be at least 80°F (27°C) for tropical cyclones form, it is natural that they form near the equator. However, with only the rarest of occasions, these storms do not form within 5° latitude of the equator. This is due to the lack of sufficient Coriolis Force, the force that causes the cyclone to spin. However, tropical cyclones form in seven regions around the world. Atlantic basin
North Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea The Hurricane season is "officially" from 1 June to 30 November. Peak activity is in early to mid September. Once in a few years there may be a tropical cyclone occurring in May or December.
See the probabilities for the Atlantic Basin by month.
Northeast Pacific basin
Mexico to about the dateline A broad peak with activity beginning in late May or early June and going until late October or early November with a peak in storminess in late August/early September.
Northwest Pacific basin
From the dateline to Asia including the South China Sea Occur all year round regularly though there is a distinct minimum in February and the first half of March. The main season goes from July to November with a peak in late August/early September.
North Indian basin
Including the Bay of Bengal and the Arabian Sea A double peak of activity in May and November though tropical cyclones are seen from April to December. The severe cyclonic storms (>74 mph / 119 kph winds) occur almost exclusively from April to June and again in late September to early December.
Southwest Indian basin
From Africa to about 100°E Beginning in late October/early November, reaching a double peak in activity-one in mid-January and one in mid-February to early March, and then ending in May.
Southeast Indian/Australian basin
100°E to 142°E Beginning in late October/early November, reaching a double peak in activity-one in mid-January and one in mid-February to early March, and then ending in May. The Australian/Southeast Indian basin February lull in activity is a bit more pronounced than the Southwest Indian basin's lull.
Australian/Southwest Pacific basin
142°E to about 120°W Begins in late October/early November, reaches a single peak in late February/early March, and then fades out in early May.
One rare exception to the lack of tropical cyclones near the equator was Typhoon Vamei which former near Singapore on December 27, 2001. Since tropical cyclone observations started in 1886 in the North Atlantic and 1945 in the western North Pacific, the previous recorded lowest latitude for a tropical cyclone was 3.3°N for Typhoon Sarah in 1956. With its circulation center at 1.5°N Typhoon Vamei's circulation was on both sides of the equator. U.S. Naval ships reported maximum sustained surface wind of 87 mph and gust wind of up to 120 mph.

The seedlings of tropical cyclones, called "disturbances", can come from:
Easterly Waves: Also called tropical waves, this is an inverted trough of low pressure moving generally westward in the tropical easterlies. A trough is defined as a region of relative low pressure. The majority of tropical cyclones form from easterly waves.


West African Disturbance Line (WADL): This is a line of convection (similar to a squall line) which forms over West Africa and moves into the Atlantic Ocean. WADL's usually move faster than tropical waves.


TUTT: A TUTT (Tropical Upper Tropospheric Trough) is a trough, or cold core low in the upper atmosphere, which produces convection. On occasion, one of these develops into a warm-core tropical cyclone.


Old Frontal Boundary: Remnants of a polar front can become lines of convection and occasionally generate a tropical cyclone. In the Atlantic Ocean storms, this will occur early or late in the hurricane season in the Gulf of Mexico or Caribbean Sea.
Once a disturbance forms and sustained convection develops, it can become more organized under certain conditions. If the disturbance moves or stays over warm water (at least 80°F), and upper level winds remain weak, the disturbance can become more organized, forming a depression.

The warm water is one of the most important keys as it is water that powers the tropical cyclone (see image above right). As water vapor (water in the gaseous state) rises, it cools. This cooling causes the water vapor to condense into a liquid we see as clouds. In the process of condensation, heat is released. This heat warms the atmosphere making the air lighter still which then continues to rise into the atmosphere. As it does, more air moves in near the surface to take its place which is the strong wind we feel from these storms.

Therefore, once the eye of the storm moves over land will begin to weaken rapidly, not because of friction, but because the storm lacks the moisture and heat sources that the ocean provided. This depletion of moisture and heat hurts the tropical cyclone's ability to produce thunderstorms near the storm center. Without this convection, the storm rapidly diminishes.

The NASA image (left) is Hurricane Wilma in October 2005. Clicking the image will load a 2mb movie (provided by NASA) showing the life of the storm. The color of the ocean represents sea surface temperature with orange and red colors indicating temperatures of 82°F or greater.

As Wilma moves northwest, then eventually northeast, the water temperature decreases (indicated by the change to light blue color) after the storm passes a particular location. This is the result of the heat that is removed from the ocean and provided to the storm.

Therein shows the purpose of tropical cyclones. Their role is to take heat, stored in the ocean, and transfer it to the upper atmosphere where the upper level winds carry that heat to the poles. This keeps the polar regions from being as cold as they could be and helps keep the tropics from overheating.

There are many suggestions for the mitigation of tropical cyclones such as "seeding" storms with chemicals to decrease their intensity, dropping water absorbing material into the storm to soak-up some of the moisture, to even using nuclear weapons to disrupt their circulation thereby decreasing their intensity. Read about tropical cyclone myths. While well meaning, the ones making the suggestions vastly underestimate the amount of energy generated and released by tropical cyclones.

Even if we could disrupt these storms, it would not be advisable. Since tropical cyclones help regulate the earth's temperature, any decrease in tropical cyclone intensity means the oceans retain more heat. Over time, the build-up of heat could possible enhance subsequent storms and lead to more numerous and/or stronger events.

There has also been much discussion about the abnormally high number of storms for the 2005 Atlantic basin (27 named storms including 15 hurricanes). Compared to the age of the earth, our knowledge about tropical cyclone history is only very recent. Only since the advent of satellite imagery in the 1960's do we have any real ability to count, track and observe these systems across the vast oceans. Therefore, we will never know the actual record number of tropical cyclones in the Atlantic Oceans.