lin12345610
The tornado is a 涡旋 ： dragon air around the shaft to rotate rapidly, by a tornado center pressure was reduced to attract, dozens of a thin layer of air currents from all sides, by inhalation 涡旋 bottom. and then into the vortex of 轴心, the strong wind always cyclones, the centre of pressure around 10% lower than the pressure.The atmosphere of instability have a strong rising air currents, the current in the flow of traffic, it was further strengthenedIn a vertical, horizontal with the speed and direction are never get wind of interaction, rising air currents in the troposphere central began to revolve, forming scale necessitatedWith the scale necessitated to the development and progress, itself became fine and strengthened. meanwhile, a small area of increased support to that of the dragon born in the form, cyclones necessitated the same process and the formation of a tornado coreA tornado's whirling core and cyclones in, it was strong enough to make a tornado to the ground. when development reached the surface pressure, the ground with a sharp rise to form strom
pangdaxiang
Terrible tornado Tornadoes, we may have all heard, but everyone to the tornado familiar? Let me introduce! Tornadoes are vortex: air around the shaft spinning coil dragon, the dragon roll centre pneumatic extreme decrease attraction, near the ground dozen meters thick a thin layer of air inside, air is from all directions inhaled vortex bottoms. And immediately he turned around the axis of eddy current, the dragon roll up the wind always cyclones sex, the center of the air pressure can than surrounding low air pressure to 10 percent. Tornadoes power is strong, harmfulness is very big also. In 1995 in American Oklahoma adeimantus Moore city in a land tornadoes, heavy objects such as roof blown out of ten miles away. Most debris falls on land tornado channel of the left side, by weight ranged often have a well-defined landing zone. The lighter fragments could fly to more than 300 kilometers outside before landing. Dragon volumes of attack suddenly and violently, produce the wind is the strongest in the ground. In the United States, a tornado annually cause deaths after the thunder. It for building destruction is quite serious, often be devastating. In intense tornadoes, house roof as gliding like flying. Once the roof coiled left, other parts of the house will follow destruction. Therefore, building houses, if can strengthen the roof of the firm sex, will help to prevent tornadoes caused heavy loss during transit. When we encounter a tornado coming, we should take the following methods from a tornado attack: first, when a tornado coming, if we at home, you should immediately ran downstairs stair avoid tornados. Second, the United States is a tornado in most places, most foreign - 8pm, the time in had better not to travel to the USA. Three, tornado coming in driving bicycle should immediately discard all items, such as low into the subway of place. Fourth, in the wilderness meet tornado should find solid rock, and couldn't find words, should avoid a tornado in bridge. On the hillside should find a quick relatively big rocks from a tornado. Tornadoes which side, you should avoid in rock in the opposite direction, When a tornado after a rock, should immediately swap places, in the opposite direction to avoid it. Well, now you should have further understanding of tornado! When you're really in a tornado, they should take the above method to escape!tornadoes A tornado was a mystery for a long time, it is precisely because of this reason, so it is necessary to understand it. Tornadoes suddenly and violently, produce the wind is the ground the strongest. Because of its occurrence and dispersed all extremely sudden, so it is difficult to it effectively observation. What is a tornado Tornadoes are vortex: air around the shaft spinning coil dragon, the dragon roll centre pneumatic extreme decrease attraction, near the ground dozen meters thick a thin layer of air inside, air is from all directions inhaled vortex bottoms. And immediately he turned around the axis of eddy current, the dragon roll up the wind always cyclones sex, the center of the air pressure can than surrounding low air pressure to 10 percent. The formation of a tornado Tornadoes are the product of thunderstorms in the clouds. Specifically, a tornado is a small part of thunderstorm enormous energy in small area concentration release of a form. Tornadoes formation can be divided into four stages: (1) atmospheric instability produces strong updraft, due to the biggest airflow passing through the rapids influence, it is further enhanced. (2) due in vertical direction and speed and direction are shear wind interaction, of the troposphere updraft in central to begin to spin, forming the mesoscale cyclone. (3) with the mesoscale cyclone to ground development and upward extend, itself tapers and strengthening. Meanwhile, a small area of the enhanced auxiliary close, namely born dragon coils in cyclone is formed within the same process, generate cyclones, forming a dragon roll core. (4) dragon roll core of rotating and cyclone the different, its strength enough to make dragon roll extends to the ground. When the development of the vortex arrive ground height, the earth pressure drop dramatically and the ground wind has risen sharply. Formation dragon volumesTornadoes detection Tornadoes wind what size is it? Nobody really knows, as tornadoes occur to dissipate the short time, the effect area too small, so the existing detection instrumentation no sensitive enough to a tornado in accurate observation. Relatively speaking, doppler radar was effective and a common observational instruments. Doppler radar alignment tornado issued by microwave beam, microwave signal the tornado crumbs and after heavy rain reflected by radar receiver. If the tornado stays away from radar, reflected back to microwave signal frequency will be the low-frequency, Conversely, if a tornado getting closer to the radar is reflected back to high frequency signals will be direction. This phenomenon has been called the doppler frequency. Receiving signal after, radar operator can through the analysis of the data, and calculates the frequency shift of tornado speed and direction of movement.Tornadoes harm In 1995 in American Oklahoma adeimantus Moore city in a LiuLong volumes, such as roof heavy objects such blown out of ten miles away. Most debris falls on LiuLong roll channel of the left side, by weight ranged often have a well-defined landing zone. The lighter fragments could fly to more than 300 kilometers outside before landing. Dragon volumes of attack suddenly and violently, produce the wind is the strongest in the ground. In the United States, a tornado annually cause deaths after the thunder. It for building destruction is quite serious, often be devastating. In intense tornadoes, house roof like hang gliding like flying. Once the roof coiled left, other parts of the house will follow destruction. Therefore, building houses, if can strengthen the roof of the firm sex, will help to prevent tornadoes caused heavy loss during transit.
dianpingyao
Tornadoes——Nature's Most Violent StormsAlthough tornadoes occur in many parts of the world, these destructive forces of nature are found most frequently in the United States east of the Rocky Mountains during the spring and summer months. In an average year, 800 tornadoes are reported nationwide, resulting in 80 deaths and over 1,500 injuries. A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable of tremendous destruction with wind speeds of 250 mph or more. Damage paths can be in excess of one mile wide and 50 miles long. Once a tornado in Broken Bow, Oklahoma, carried a motel sign 30 miles and dropped it in Arkansas!so，what causes tornadoes?Thunderstorms develop in warm, moist air in advance of eastward-moving cold fronts. These thunderstorms often produce large hail, strong winds, and tornadoes. Tornadoes in the winter and early spring are often associated with strong, frontal systems that form in the Central States and move east. Occasionally, large outbreaks of tornadoes occur with this type of weather pattern. Several states may be affected by numerous severe thunderstorms and tornadoes.During the spring in the Central Plains, thunderstorms frequently develop along a "dryline," which separates very warm, moist air to the east from hot, dry air to the west. Tornado-producing thunderstorms may form as the dryline moves east during the afternoon hours.Along the front range of the Rocky Mountains, in the Texas panhandle, and in the southern High Plains, thunderstorms frequently form as air near the ground flows "upslope" toward higher terrain. If other favorable conditions exist, these thunderstorms can produce tornadoes.Tornadoes occasionally accompany tropical storms and hurricanes that move over land. Tornadoes are most common to the right and ahead of the path of the storm center as it comes onshore.
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