How is a tornado caused?

Edit the introduction of this paragraph.

Tornado [1] is a strong wind vortex accompanied by a high-speed rotating funnel-shaped cloud column, which is produced by the strong convection movement of two air streams in extremely unstable weather. Tornadoes have a strange appearance. Its upper part is black or thick gray cumulonimbus clouds, and its lower part is a drooping funnel-shaped cloud column shaped like an elephant's nose. The wind speed is generally 50 meters per second to 100 meters, and sometimes it can reach 300 meters per second. Because the air inside the tornado is extremely thin, the temperature drops sharply and the water vapor condenses rapidly, which is also an important reason for the formation of funnel cloud column. tornado

Strong cyclone produced by funnel-shaped clouds (tornadoes) extending from the bottom of thunderstorm clouds to the ground, with wind power of more than12m and maximum of more than100m per second, usually accompanied by thunderstorms and sometimes hail. Attracted by the extremely low air pressure in the center of the tornado, the air rotates rapidly around the axis of the tornado. In the thin layer of air tens of meters thick near the ground, the airflow is sucked into the bottom of the vortex from all directions, and then becomes a vortex around the axis. The wind of a tornado is always cyclonic, and the air pressure in its center can be 10% lower than that around it, generally as low as 400 hectopascals and as low as 200 hectopascals. Tornadoes have a great sucking effect, which can suck the sea (lake) water away from the sea (lake) surface, form a water column, and then connect with the clouds, commonly known as "dragon water absorption".

Edit this paragraph into a table.

Tornadoes are a natural phenomenon and the product of thunderstorms in the clouds. Specifically, a tornado is a form in which a small part of the huge energy of a thunderstorm is released in a small area. The formation of tornadoes can be divided into four stages: (1) the instability of the atmosphere produces a strong updraft, which is further strengthened by the influence of the maximum transit airflow in the rapids. (2) Due to the interaction with the wind with shear speed and direction in the vertical direction, the updraft starts to rotate in the middle of the troposphere, forming a mesoscale cyclone. (3) With the development and upward extension of mesoscale cyclone to the ground, it becomes thinner and stronger. At the same time, a small area to strengthen cooperation, that is, the primary tornado is formed inside the cyclone, and the same process of producing the cyclone forms the tornado core. (4) The rotation in the tornado core is different from that in the cyclone, and its intensity is enough to make the tornado extend to the ground. When the developing vortex reaches the ground, the ground air pressure drops sharply and the ground wind speed rises sharply, forming a tornado. Tornadoes often occur in thunderstorm weather in summer, especially in the afternoon to evening. The attack range is small, and the diameter of tornadoes is generally between ten meters and several hundred meters. The survival time of tornadoes is generally only a few minutes, and the longest is no more than a few hours. The wind is particularly strong, and the wind speed near the center can reach 100-200m/s, which is extremely destructive. Where tornadoes pass, trees are often pulled up, vehicles are overturned, buildings are destroyed, and sometimes people are sucked away, which is very harmful.

Edit the characteristics of this paragraph

outfall

Tornado is the strongest vortex phenomenon in the atmosphere. Although its influence is small, it is extremely destructive. It often destroys crops and tens of thousands of fruit trees in an instant, interrupts traffic, collapses houses and loses human and animal lives. The horizontal range of tornadoes is very small, ranging from several meters to several hundred meters in diameter, with an average of about 250 meters and a maximum of about 1 km. The diameter in the air can be several kilometers, and the maximum is 10 kilometers. The maximum wind speed can reach 150 km to 450 km per hour. Tornadoes usually last only a few minutes, and the longest is only a few minutes, but the disaster caused is very serious. Tornadoes often occur in thunderstorm weather in summer, especially in the afternoon to evening. The attack range is small, and the diameter of tornadoes is generally between ten meters and several hundred meters. The survival time of tornadoes is generally only a few minutes, and the longest is no more than a few hours. The wind is particularly strong. It is extremely destructive. Where tornadoes pass, trees are often pulled up, vehicles are overturned, buildings are destroyed, and sometimes people are sucked away, which is very harmful.

Edit this paragraph type

1. Real tornado (1) Multi-vortex tornado finger belt

Tornado (17 photo) A tornado with more than two whirlpools revolving around the same center. Multi-vortex structures often appear in violent tornadoes, and these small vortices often cause greater damage in the area where the main tornado passes. ② waterspout (or watersuput, English). It can be simply defined as a water tornado, usually referring to a non-supercell water tornado. Waterspouts may appear in oceans and lakes all over the world. In the United States, waterspouts usually occur on the southeast coast of the United States, especially in southern Florida and the Gulf of Mexico. Although waterspout is a kind of tornado by definition, its destructive power is less than that of the most powerful grassland tornado, but it is still quite dangerous. The hose will overturn the ship and destroy it. When it lands, it will do more harm and take away life. When waterspouts may be produced or are already visible in coastal waters, the National Weather Service often issues special maritime warnings or tornado warnings when waterspouts will move to land. Dragon absorbs water: another name for tornado. Tornado, named after it is very similar to Donghai Dragon in breaking the waves in ancient mythology, has many aliases, such as "dragon absorbs water", "dragon wags its tail" and "upside down dragon". Tornadoes are water-absorbing dragons, which are common tornadoes on land. Tornadoes are the flow of air, and air is invisible. We can only see it because the air pressure in the center of the tornado is very low and attractive. Attract dust, water vapor and other sundries. So we can see the outline of the tornado. If a tornado moves on the water, the center of the tornado will suck water into the sky like a syringe. Due to gravity, liquid water cannot stay in the air for a long time. So after the dragon absorbs water, the water sucked into the sky will fall down. It formed rain, which was a heavy rain. So the so-called dragon water absorption is a tornado. The dragon absorbs water, which vividly describes this phenomenon. Shenzhen Shekou Shuanglong water absorption

Dragon suction is a tornado that occasionally appears over warm water. Its upper end is connected with thunderstorm clouds, and its lower end directly reaches the water surface, rotating and moving at the same time. This is a vortex, and the air rotates rapidly around the axis of the tornado. Attracted by the extremely low air pressure in the center of the tornado, the water flow is sucked into the bottom of the vortex and then becomes a vortex around the axis. Tornadoes roll water from lakes or oceans into the air, forming a high water column. Like being sucked into the air, the water in the water column is commonly called "dragon water absorption" or "tornado water". From a distance, the water column swept into the air by a tornado is not only like a python dangling in the air, but also like the nose of an elephant that keeps swinging. On September 3, 2007, the "Dragon Sucking Water" spectacle appeared in Xingyun Lake in Jiangchuan, which was reported by the media and attracted wide attention from all walks of life. Villagers along the lake generally believe that "dragon absorbs water" is a common natural phenomenon, which has been rainy for many years, but there are also some mysterious phenomena that are difficult to explain. Li Jiangui, a villager from Shiyanshao Village, Luju Town, Jiangchuan County, started fishing at the age of six or seven. He is 47 years old. He told the author that he had seen too many phenomena of "dragons absorbing water", but such a magical landscape on September 3 was rare. On August 3, 2009, the landscape of "dragon absorbing water" appeared on Changchun Lake in Qixia City. On the same day 16, a towering water column suddenly rose on the lake in Changchun, and it rained cats and dogs instantly. At 7: 30am on June 4th, 2009, at 10, a spectacular sight of three dragons sucking water appeared in Bohai Bay. They suck a lot of seawater into the air, and then bring thunderstorms. Bohai bay dragon absorbs water

At 9: 30 in the morning of August 23, 2009, when I went to Erhai Lake, the weather suddenly changed, the water was covered with dark clouds, and a water column was connected between the sea and the sky like a black dragon. Due to the vigorous development of cumulus clouds over Erhai Lake, the up-and-down convection movement intensifies and the temperature difference increases, forming this spectacle. 20 10 at 9 o'clock in the morning on July 27th, a rare tornado appeared in the sea between Hong Kong and Shenzhen, forming three rare dragon-sucking landscapes on the sea surface. On the morning of September 6, 2065438+00, in the intermittent rain, a "dragon" fell into the lake from the boundless sky ... This story that sounds like a myth really happened in Qinghai Lake, which is located on the Qinghai-Tibet Plateau, with an altitude of 3200 meters. On September 1 day, the meteorological landscape of dragon water absorption appeared twice in Qinghai Lake, and the plateau Shenhu Lake added more exotic colors. (3) landspout (called dust tube tornado by the National Weather Service) is a term used to describe tornadoes unrelated to mesoscale cyclones. Tornadoes and waterspouts have some similar characteristics, such as relatively weak intensity and short duration, and funnel-shaped clouds formed by condensation often do not touch the ground. Although the intensity is relatively weak, tornadoes will still bring strong winds and serious damage. (4) Fire tornado, a very rare tornado, is a combination of tornado and flame. Brazilian tornado.

[2]2065 438+00 Brazil, located in the southern hemisphere, suffered from a rare drought and little rain, and many places in the country ignited mountain fires. On August 24th, a tornado blew at a fire spot in Sao Paulo, Brazil, forming a rare fire tornado landscape. The tornado rolled up a flame several meters high and spun like a giant fire dragon. This "Dragon Wind" was taken on the 24th. "Fire Dragon" flew several meters in the burning field, blocking a road. In order to put out this "fire dragon", local helicopters were dispatched. It hasn't rained for three months in the area with "Dragon Wind". Unusually dry weather and strong winds contributed to the fire here. Brazil's Global TV reported that the air dryness in Sao Paulo has caught up with the Sahara desert. 2. Tornado-like phenomenon (1) Gust Tornado (English: gustnado) is a small vertically rotating airflow related to gust front downburst. Because they are not strictly related to clouds, it is still controversial whether they belong to tornadoes. When the fast-moving dry and cold airflow overflowed by thunderstorm flows through the static warm and wet airflow at the overflow edge, it will cause the rotation effect (which can be explained by "cirrus cloud"). If the wind shear in the lower level is strong enough, this rotation will be horizontal (or oblique) and affect the ground, and the final result will be gust. The rotation direction of gust coil is not fixed, which can be clockwise or counterclockwise. (2) Dust storms are also columnar vertical rotating airflow, so they are very similar to tornadoes. However, they are produced in clear weather, and in most cases, they are weaker than the weakest tornado. When the temperature is high, if there is a strong updraft on the ground due to the high temperature and there is enough low-altitude wind shear at this time, the updraft may make a small-scale cyclone movement, and a dust roll will be formed at this time. Dust roll is not a tornado, because it is formed in sunny weather and has nothing to do with clouds. However, they occasionally cause great damage, especially in arid areas. Dragon water absorption, another name for tornado, is a strong wind vortex accompanied by a funnel-shaped cloud column rotating at high speed, which is produced by strong convection of air in extremely unstable weather. The wind speed near the center can reach 100 m/s ~ 200 m/s, and the maximum wind speed is 300 m/s, which is several times higher than that near the center of typhoon (generated at sea). It is extremely destructive. Dragon-sucking tornado forms "dragon-sucking water" above the water surface. A tornado is at sea.

In midsummer, when listening to the typhoon weather forecast, you can often hear the words "the wind force near the typhoon center is above 12". It seems that "12" is the best wind. Is there a stronger wind in nature? Yes, it was a tornado. Tornadoes, commonly known as "dragons suck water", may be named because their funnel-shaped cloud columns look like mythical "dragons" falling from the sky and sucking water into the air. In fact, it is a strong wind vortex with small range and strong wind force extending from the bottom of thunderstorm cloud to the ground or water surface. Tornado winds are very strong. Near the tornado center, the horizontal wind speed can reach more than 100 meters per second, and in extreme cases it can reach 300 meters. 12 wind speed is equivalent to more than 30 meters per second, which is naturally not as good as a tornado. The damage caused by such a rare huge wind force is amazing. When it touches the ground, it can throw people and animals into the air like a joke, and then throw them down. It can "pull up weeping willows", destroy buildings and even cut off a corner of a solid tall building like a sword. On September 24th, 1956, a tornado appeared in Shanghai. It actually lifted a three-or four-story 1 10 ton oil storage tank into the air of 15 meters, and then threw it away from 100 meters. During 1925, a powerful tornado occurred in the United States, causing more than 2,000 casualties. Why is the tornado so strong? The main reason is that a large amount of air escapes in the tornado, which makes the air in the center of the tornado very thin and the air pressure is very low, which is particularly different from the air pressure in the periphery. The air difference between the typhoon center and the periphery is 20 millibars per 100 km on average, while the air difference between the tornado center and the periphery is 20 millibars as long as it is 20 meters. The greater the pressure gradient, the greater the wind force. No wonder tornadoes are many times stronger than typhoons. The area covered by the tornado is very small. 1927 A tornado in North Carolina, USA, in which trees were uprooted within 15 square meters, is safe near the tornado. Ssangyong Suction 2011On May 3, a rare "Ssangyong Suction" landscape appeared in Honolulu Port, Hawaii. Two huge water columns extend from the sea to the sky, with lightning and thunder, and it rains cats and dogs. Many passers-by were attracted by the rare wonders of this sister tornado and stopped to watch. The bad weather caused floods, and electric shocks caused 60,000 households to lose power for 2 hours, but this did not cause casualties. Schonley Solomon, a student, said, "I saw lightning passing near my dormitory. It hangs in the sky like a purple rope. " The duration of these two tornadoes at sea is about 12 minutes, which is rare in Hawaii.

Wonders of water-absorbing tornado in Shuanglong, Hawaii, USA (5 photos) When cyclones appear in rivers, lakes or oceans, tornadoes will form. When the cold air mass in the atmosphere passes through the water body, the warm and humid gas rises upward, forming a huge water column-a "castle" composed of fog and condensate. When these magnificent water columns pass over the sea, they will leave traces of water vapor formation. The diameter of the water column varies from several feet to several hundred feet, and its length exceeds 1 mile (1.6 1 km), and it goes deep into the clouds. Tornadoes at sea are weaker than cyclones, and often only when they cross the land will they pose a threat to people. At about 5: 50 pm on the 3rd, the wonder of "Ssangyong Absorbing Water" appeared, then slowly moved westward for a while and then disappeared. As the sun sets, it rains harder and harder, and lightning gradually increases. It is said that hail the size of peas will fall in Maui. Honolulu county issued a flood warning. According to Honolulu Daily, firefighters answered about 12 calls from flood-affected families. A family in Wynai said that lightning struck their radio antenna, and current entered the room along the wires, causing sparks and explosions and burning out their speakers. According to John Bray, a meteorologist with the National Weather Service, unstable air masses will continue to appear on May 4th. He told Honolulu: "We will still see thunderstorms, but not as big as May 3rd." [3]

Edit this section of danger

1995 In a tornado in Admore, Oklahoma, USA, heavy objects such as roofs were blown dozens of miles away. Most of the debris falls on the left side of the tornado passage, and there are often obvious landing areas according to the weight. Lighter debris may fly more than 300 kilometers before landing. Under the attack of a strong tornado, the roof of the house will fly like a glider. Once the roof is swept away, the rest of the house will collapse. Therefore, if we can strengthen the stability of the roof when building houses, it will help to prevent the tornado from causing huge losses when crossing the border. The tornado struck suddenly and violently, and the wind force produced was the strongest on the ground. In the United States, the number of deaths caused by tornadoes is second only to lightning every year. Its damage to buildings is also quite serious, often devastating. 1626 (6th day of May, Ming Taizu Xi) At 9: 00 am on May 30th, a bizarre disaster suddenly broke out around Beijing Wang Gong factory (now Xuanwu Gate, Beijing). Tianbian Dibao, the official news publication of Ming Dynasty with important historical value, recorded the disaster in detail. Excerpts are as follows: "The east corner of Jizhou collapsed, with hundreds of rotten houses. On the tenth day, two people were dug out of the ground and still alive. Asked, the cloud:' drunk as a dream'. Dig another old man to live. " In the catastrophic disaster of Wang Gong factory, what force can make three people fly from Beijing to Jizhou 180 without dying? What power can strip people naked and send them hundreds of miles away without hurting people? Why don't naked people know how their clothes are taken off? There must be some inevitable factor at work, but can human beings recognize this inevitable factor in the future? Can this magical power be mastered, controlled and utilized by human beings in the future? 1On May 27th, 999, four counties in central Texas, including Austin, the capital, were hit by a huge tornado, killing at least 32 people and injuring dozens. It is reported that in jarrell, 40 miles north of Austin, more than 50 houses collapsed and more than 30 people were killed in the tornado. The damaged area is 1 mile long and 200 yards wide. This is another tornado area in the United States after Miami was hit by a tornado on May 3, 65438. Generally speaking, a tornado is a whirlwind. When it touches the ground, its diameter ranges from several meters to 1 km, with an average of several hundred meters. Tornadoes range from a few meters to dozens of kilometers, and things are robbed everywhere. The funnel-shaped center of tornado is composed of inhaled dust and condensed water vapor, which is a visible "dragon mouth". On the ocean, especially in the tropics, similar scenes are called sea tornadoes. Tornado in sandbar

Most tornadoes rotate counterclockwise in the northern hemisphere and clockwise in the southern hemisphere, with some exceptions. The exact mechanism of tornado formation is still under study, and it is generally believed to be related to the violent activities of the atmosphere. Since19th century, the accuracy of weather forecast has been greatly improved, and various disasters and storms such as tornadoes and hurricanes can be detected by weather radar. Tornadoes are usually extremely fast, and it is not surprising that the wind speed is 100 meters per second, even reaching more than 175 meters per second, which is five or six times larger than the typhoon 12. The range of wind is very small, generally the diameter is only 25~ 100 meters, and only in rare cases can the diameter reach more than one kilometer; It takes only a few minutes from occurrence to disappearance, at most a few hours. Tornadoes are also very powerful. There was a tornado 1956 in Shanghai on September 24th. It easily lifted a large oil storage barrel weighing 220,000 Jin to the altitude of15m, and then threw it away from120m. 1879 at 4 pm on may 30, two dark and thick clouds were merging over northern Kansas. After 15 minutes, a vortex was generated at the lower end of the cloud. The vortex has grown rapidly and become a huge pillar of indomitable spirit. Within three hours, it ran wild all over the state like a dragon, and no one was spared wherever it went. However, the strangest thing happened at the beginning, when the tornado whirled across a small river and met a cliff. Obviously, it is impossible to surpass this obstacle, so the vortex turns to the west, and there happens to be a newly built 75-meter-long railway bridge over there. The tornado vortex actually pulled it down from the stone pier, twisted it a few times, and then threw it into the water.

Edit the classification of this tornado.

Tornadoes are classified into 0-6 enhanced Fujita grades according to their damage degree, referred to as EF grade, which was proposed by Dr. Fujita of Vancouver University in 197 1 year. EF0 grade: 100 km/h- 140 km/h, which can blow away branches, chimneys and road signs, blow up lighter fragments and break glass. This level of tornado has less destructive power, so we call it a mild tornado. EF 1 Grade: 14 1km/ hour-190 km, which can roll away the roof, blow down the prefabricated houses and scrape the car off the road. Tornadoes of this level are moderately destructive, so we call them medium tornadoes. EF2 level: 65,438+0,965,438+0 km-260 km/h, which can blow the heavy licorice bag hundreds of meters away, overturn the car, uproot the trees, and blow away the roof and walls together. Tornadoes of this level are more destructive, and we call them large tornadoes. EF3 class: 2,665,438+0 km-320 km/h, which can take away roofs, walls, furniture and cars all off the ground, trucks, trains and trains all derail and take them away, and all trees are uprooted. Tornadoes of this level are seriously damaged, so we call them strong tornadoes. EF4 level: 32 1 km-430 km/h, a solid house was razed to the ground when the car was swept away. Tornadoes of this level are very serious, and we call them destructive tornadoes. EF5: 4,365,438+0 km-520 km/h, large buildings can be blown up, cars and trees can be blown away, and all furniture becomes deadly missiles. Tornadoes of this level are devastating, and we call them destructive tornadoes. EF6 level; 52 1 km-600 km/h, trains, trucks and trains were blown off, cars spewed out for several kilometers, and pavement asphalt was scraped off. The destruction degree of this series of tornadoes is doomsday, which we call doomsday tornadoes.

Edit this tornado "corridor"

brief introduction

The tornado corridor extends from the Rocky Mountains to the Appalachian Mountains. There are 1000 tornadoes every year here, and the wind speed reaches 500 km/h, which will destroy farmland, houses, people and animals along the way. Interstate 44 between Oklahoma City and Tulsa is called "I-44 Tornado Corridor", where more than 6,543,800 residents are used to the annual tornado season. Every spring, when the dry cold air from the Rocky Mountains crosses this lowland plain and meets the hot and humid air from the Gulf Coast, the tornado will arrive as scheduled.

Tornado "Corridor"-Historical Damage

Since 1890, more than 120 tornadoes have hit Oklahoma City and its surrounding areas. 1On May 3, 999, a tornado swept through the surrounding area of Oklahoma City, razing 1700 houses and damaging 6,500 buildings. Most areas along the same highway in northeastern Oklahoma City are also frequently hit by tornadoes. In Tulsa, a small town with a population of 590,000, 1950 suffered 69 tornadoes from 2006 to 2007. In addition, Tulsa is built on the Arkansas River, which is a plain alluvial by a series of streams, and it is also vulnerable to floods in the bad weather of heavy rain. 1974, 1976 and 1984 caused losses of several hundred thousand yuan.

Tornado "corridor"-a dangerous journey

July 5, 2065438+00 If you are tired of beach vacation and want to find a different experience this summer, I suggest you consider traveling to the Midwest of the United States. "Storm chasers" Roger Hill and Karin Hill provide services for adventurous tourists to chase tornadoes. They will take a team of 18 people and take three buses for a 10 day tour in the "tornado corridor" of the United States. The daily fee for tourists is $30. The Tornado Corridor extends from the Rocky Mountains to the Appalachian Mountains. There are 1000 tornadoes every year here, and the wind speed reaches 500 km/h, and the farmland, houses, people and animals passing by will be destroyed. Since 2000, the couple have taken nearly 65,438+0,500 people to the Midwest to watch tornadoes at close range.

The tornado "corridor" is getting wider and wider

20 10, 10 in February, American scientists found that many places in the southern States of the United States may be more prone to tornadoes than Kansas. By counting the incidence of tornadoes per square kilometer in 48 states except Alaska from 1950 to 2007, P. Grady Dixon, a geoscientist at Mississippi State University, and his colleagues determined that at least one tornado passes through 25 miles every year in some areas of south-central Mississippi and central Arkansas (areas indicated by orange and crimson in the figure). This ratio is similar to what happens in tornado hot spots on the great plains. Compared with many places that are traditionally considered to be located in the center of tornado corridors, the probability of tornadoes in some places in Smith County, Mississippi, which suffered the most in American history is higher, about 35%. The research team pointed out that expanding the tornado hazard map including these areas will raise public awareness and increase efforts to reduce the losses caused by tornadoes.

Tornado's road to death "corridor"

More than 65,438+0,000 tornadoes break out every year in the tornado corridor in the Midwest of the United States. There, a tornado with a speed of 500 kilometers per hour came madly. As long as you walk in here, you are likely to die because of a tornado, heavy hail from the sky or deadly weapons thrown by lightning with extremely high temperature. Therefore, it is best not to go to the tornado corridor.

Edit this paragraph to prevent

(1) At home, be sure to stay away from doors, windows and external walls of houses and hide in the wall or small room opposite the tornado. The safest place to avoid a tornado is the basement or semi-basement. Tornado, magical nature

(2) In case of emergency such as pole collapse and house collapse, the power supply should be cut off in time to prevent electric shock or fire. (3) When there is a tornado outside the venue, you should look for low-lying land nearby, but stay away from trees and telephone poles to avoid being smashed, crushed and electrocuted. (4) When the car encounters a tornado when going out, you must not drive to avoid it, nor do you avoid it in the car, because the car has almost no defense ability against tornadoes. You should leave the car immediately and avoid it in a low-lying place.

Edit this test

Tornadoes have long been a mystery, and it is for this reason that it is necessary to understand them. The tornado struck suddenly and violently, and the wind force produced was the strongest on the ground. Because of its suddenness and dispersion, it is difficult to observe it effectively. What is the wind speed of a tornado? No one really knows, because the time from the occurrence to the dissipation of tornadoes is very short and the area of action is very small, so that the existing detection instruments are not sensitive enough to accurately observe tornadoes. Relatively speaking, Doppler radar is an effective and commonly used observation instrument. Doppler radar aims at the microwave beam emitted by the tornado, and the microwave signal is reflected by the debris and raindrops in the tornado and then received by the radar. If the tornado is far away from the radar, the frequency of the reflected microwave signal will move to the low frequency direction; On the contrary, if the tornado gets closer and closer to the radar, the reflected signal will move to the high frequency direction. This phenomenon is called Doppler frequency shift. After receiving the signal, the radar operator can calculate the speed and moving direction of the tornado by analyzing the frequency shift data.

Edit this passage of American tornado disaster

2065438+02 [4] On March 2, Alabama and Tennessee in the southern United States were hit by tornadoes, and at least two tornadoes hit the northeastern part of the state that day. The two tornadoes hit Huntsville at about 9: 00 a.m. to 9: 30 a.m. local time, with an interval of about 10 minute. In Alabama, tornadoes damaged many houses, blew down many trees and injured at least four people. In Capshaw, 0/6 km from Hunts Viljo/Kloc-,the state prison in Lemstone, Alabama was also damaged by a tornado. The prison is a maximum security prison, holding more than 265,438,000 prisoners, about 200 of whom are HIV-positive and are held in isolation. Although Alabama prison was destroyed by a tornado, no prisoners escaped. Part of the outer wall of the prison and two prison houses were damaged, but the prison itself remained safe. In addition to Alabama, Chattanooga, Tennessee was also hit by a tornado, injuring more than 20 people. The local Hamilton County Sheriff's Office confirmed that many local people were injured due to extreme weather, and the Bradley County Government also confirmed that houses were damaged. A huge storm system is raging in the eastern, western and southern parts of the United States. This storm system has caused tornadoes in several states since February 28th, 20 12, and killed 13 people in Kansas, Missouri, Illinois and Tennessee.

2065438+On March 2, 2002, a tornado hit the southern United States (6 photos)