Hurricane (cyclone) cyclone storms form of tornadoes, an area of low pressure, decreasing the value of pressure where the parties toward the center So Mounkhvd also known as air. The greater the pressure difference between the center of the storm and limbs, the greater the depth and the greater its effectiveness. And moving air and wind toward the center of the hurricane in the movement of turbulence semi-circular cross lines of equal pressure are angled (20-30 degrees) in opposite orientation and movement of a clock in the northern hemisphere, and vice versa in the southern hemisphere (Figure 1). And is characterized by the hurricane activity is generally rise aerobic movements that are associated with it, with the attendant disruption in the atmosphere.
Cyclone genesis and types of
If the term hurricane is used to denote the stage at which the low air maximum intensity, with its accompanying high-speed winds, and major upheaval in the weather, but it is a result of coupling the cyclone low pressure, each of them is used to denote the other. However, some researchers prefer to use the term synonymous with Hurricane Hurricane Hurricane and tropical cyclones and subtropical other because of the wind speed class 12 according to the Beaufort scale Beaufort [t. Wind] speed 32.7 m / sec or more. When you look at most of the literature of climate to the hurricane as a synonym for low air, which can develop its effectiveness to reach the stage of the storm ff (14 m / sec and above, according to the Beaufort scale). And distinguish some researchers depressions mobile, referred to as cyclones, depressions of relatively stable and the vast extension (as low thermal depressions India seasonal, low-polar, low-Arctic air, low-septal).
If the promised any area of low pressure associated disorder with limited space in the air, is a region cyclone, the cyclone in the world can be classified into three main groups:
Large-scale hurricanes, cyclones and know the wave, or frontal depressions, are stationed in the Central Hotel.
Medium-sized hurricanes, known as tropical cyclones, based in low offers.
Hurricanes small size, which is known as Tornado Tornado (rotors) and offers abound in semi-tropical.
To avoid confusion between hurricanes Hotel Central (hurricanes frontal) and tropical cyclones, for their differences, not only in intensity, but in the way the origin and development, turn some of them to use the term low frontal (or wavelength) to refer to hurricanes Hotel Central to distinguish it from tropical cyclones.
Hurricanes differ among themselves in terms of its inception, and the mechanism of formation and development. Typhoons tropical cyclones Tornado is not yet clear details of the parameters of its inception, and ways to pose, but it is known that they build up in the areas of heating deep outside the Hotel Tropical which weaken the strength Korieuls Force (deflection of moving objects right in the northern hemisphere and left in the southern half of the globe) often to fade at the equator where the instability generated severe air, which rises as a result of the strongly upward in the movement of air turbulence around the center of the region where the pressure has been reduced greatly in comparison, including around. If the tropical cyclones formed over tropical seas only, the Tornado is formed in the presentations of tropical and Central America over the land, and formed over the sea, and both (tropical cyclone, and Tornado) composed of a homogeneous air mass in general, always hot. The frontal cyclones, consist of a result of a collision between two Hoaiitin Mokhtfatti heat and humidity, as generally occurs between latitudes 30-60 degrees north and south of the equator.
The tropical cyclones that defines the names of local areas occur (Alhorikan in the North Atlantic and eastern Pacific, the typhoon Typhoon in the Pacific Northwest, and the cyclone cyclone in the Indian Ocean, and Albagbo Baguio in the Philippines, and Weyl Willy Willy-Willy in the Australian and mentioned Hurricanes in the heritage books with different names according to the intensity and effectiveness, including the Dragon, dizziness, whirlpool and Whirlwind) does not form, never on land, but is confined posed in specific regions of the seas and tropical that increase the temperature of its surface water to 27 degrees Celsius, and be a force Korieuls are clear, as is the case between latitudes 50-20 degrees north and south of the equator, with the exception of the South Atlantic, which does not form, such as those in which hurricanes (Figure 2). Once they reach hurricane to land even take to fade, yet to spread devastation and destruction, as they fade and fade away if they moved over the surface water is cold, and getting dragged these cyclones with air traffic situation in the Hotel Tropical (belly-commercial) at the speed of 15-30 km / h . Although Qatar tropical cyclone ranging between 100 - 1000 km. However, the pressure drop in his position decreased significantly (up to 950 millibars and Madon) and this is evidence of the depth of the strong and highly effective, as the flowing air around the epicenter in the movement of turbulence at speeds exceeding 100 km / h at times to more than 300 km / hour. And discriminates in the tropical cyclone in three parts, the most calm center area known into the cyclone (diameter 10-50 km) circinate around a huge wall of thick clouds that increases beyond the horizontal to 100 km and distinct movements Bags vertical rising violent, and this represents the wall Part severe turbulence in the cyclone, and ends Hurricane margins of various aspects of at least worries about the area of the wall (Figure 3).
The most violent tornadoes Tornado ground. It seems to suppression of the outside of the bottom of the thunderstorm cloud (Mezni debris) up to the surface of the earth, consists in most cases in the mid-latitudes at the top of some cold fronts. And is characterized by limited horizontal spillover Tornado, as the diameter of generally no more than 0.5 km, and strongly rotational movement of air around the epicenter, which could reach a speed of more than 300 km / hour. And is accompanied by crossing Tornado down in a sudden air pressure amounts to about 25-50 millibars, with a consequent explosion of the buildings and crashing as a result of the pressure difference between inside and outside. Tornado occurrence and confined between latitudes 15-45 north of the equator and the south, especially in the basin of the Mississippi (United States) and east of the Andes (Argentina) and the Australian continent. Known as Tornado cyclones which form over the sea on behalf of Ahawaehg water spout of water which is very dangerous to marine transportation.
The mid-latitudes cyclones known frontal cyclones, or depressions wave Cruciform generally in the areas of air collision in mid-latitudes, and thus it is composed of different sectors of the air, one sector of the cold air, and the other from hot air. The warm and cold fronts the basic structure of the frontal cyclone (Fig. 4). If the old concepts attributed the emergence of hurricanes frontal to the ripples are formed and evolve along the surface of separation of frontal large Kaljbhp polarity between the air tropical and Arctic air complement its life in about three days, the modern concepts of linking hurricanes, frontal movements in the air top-shaped waveform which leads to the formation of centers of low air pressure at the surface to evolve according to the later stages of development known waveform. And frontal storms appear on the weather maps in the form of huge booths with elliptic shape (dimensions 1000 × 2000 km on average), and moving towards the east in groups within the scope of westerners Central offers a rate of speed ranges 30-50 km / hour. The wave of hurricanes varies from each other in their effectiveness, according to the degree of depth, so the intensity of air turbulence, and the increase in wind speed behind the cold front, may make it a storm of sometimes amount to the severity of this convergence of winds in tropical cyclones.
Hurricanes and a prominent role in the climate of areas that are exposed, as it leaves the direct effects on various aspects of the human environment. Typhoons wave Bomtarha Thelugea and a source of good and blessing, as it is a factor in the event of the destruction of the accompaniment of the violent storms of snow and rain Saliyah. The weather disturbance in most cases when a cold front passage of the hurricane. The cyclone roller (Tornado) charge the destruction of what anything in way over land and sea, as it uprooted trees, shattered buildings, flying cars several meters into the air, and escape from ships as well, and rarely go years without that common tropical cyclone devastation and destruction in the region or more of the world, and not due to sabotage their rotational wind speed only severe, but also to the heavy rains that caused massive flooding, and to the tsunami and its facilities, which raises the water eight meters. And examples of many tropical cyclones: Viasar Camille, which hit the coast of the states of Mississippi to Oiseanp (United States) on 17-18 August 1969 has killed 256 people, and the amount of material losses and a half billion dollars. The cyclone that hit Bangladesh on 11-12 October 1970 and led to the deaths of more than 300 thousand people and damaged material exceeding one billion dollars, as well as the cyclone that struck Bangladesh, also on 2-3 May 1991 and led to the deaths of more than 120 thousand people and the displacement of millions of people.
Hurricane opposite (anti Cyclone)
Cyclone-anticyclone called the opposite to any area with high atmospheric pressure at height, so is also known as air pressure is increasing the value of the parties towards the center, opposite a cyclone air system is usually much greater than the hurricane. Quietly and is characterized by its center, and the activity of the horizontal movement of air at the ends. And air movement might be beyond him and far between for the direction of cyclone centers. And takes the point of moving air and the approval of the destination Clockwise in the northern hemisphere, and the opposite in the southern hemisphere (Fig. 5).
There are two forms of adverse hurricanes:
Hurricane opposite relatively stable: the hurricane and know the opposite warm, because it has a warm center, and continue to warm as a result dynamic continuous decline in the air, and waxed strong in the opposite warm cyclone with height. An example of this model, semi-tropical high pressure.
Hurricane Mobile opposite: the opposite is known as cold hurricane. And be in fast motion, and short-term durability in general, as it is characterized Dhalth opposite opposite hurricane so warm. And is limited to hurricanes, the adverse cold in the presentations generally higher within the Arctic air or very cold, and examples are: Hurricane opposite the Siberian, and Canadian Hurricane opposite. The stretch of the year towards mid-latitudes in winter.
The hurricanes adverse headwaters of the blocks all the air. And is characterized by the atmosphere at a calm, stability, sovereignty and soberness, that the air movement within them downward, and the wind emanating from the edges light speed. However, it may be accompanied in some winter nights a fog, clouds and low-class, which sometimes result in the [/SIZE][/SIZE]precipitation in the spray