Íàçâàíèå: This Is America (Å. Ã. Ãðèøåíêîâà)
1 KEY WORDS
Match the vocabulary items with their definitions
2 FIND THE INFORMATION
Read the text as quickly as possible and answer the questions:
1. What is a tornado like?
2. How do tornadoes form?
3. What speed can tornadoes reach?
4. How many tornadoes are reported nationwide each year?
5. What part of the USA are tornadoes observed more often?
6. When do tornadoes strike most often?
7. When did the deadliest American tornado on record hit?
8. What place do experts recommend as the best during a tornado?
9. When was a system to rate tornados developed?
10. What is the goal of VORTEX2?
Understanding how tornadoes work
This week, we will tell about the science of tornadoes. Tornadoes have been observed in many parts of the world. But the storms are most often found in the United States.
Tornado season has begun in the United States. Violent storms struck several parts of the country last week. The National Weather Service said there were ten reports of tornadoes across the central and southern Plains states last Thursday.
A tornado is a violently turning tube of air suspended from a thick cloud. It extends from a thunderstorm in the sky down to the ground. The shape is like a funnel: wide at the top, narrower at the bottom.
Tornadoes form when winds blowing in different directions meet in the clouds and begin to turn in circles. Warm air rising from below causes the wind tube to reach toward the ground. Because of their circular movement, these windstorms are also known as twisters.
The most severe tornadoes can reach wind speeds of three hundred twenty kilometers an hour or more. In some cases, the resulting paths of damage can stretch more than a kilometer wide and eighty kilometers long.
With a tornado, bigger does not necessarily mean stronger. Large tornadoes can be weak. And some of the smallest tornadoes can be the most damaging. But no matter what the size, tornado winds are the strongest on Earth. Tornadoes have been known to carry trees, cars or homes from one place to another. They can also destroy anything in their path.
Tornadoes have been observed on every continent except Antarctica. But experts say they are most commonly seen in the United States. On average, eight hundred tornadoes are reported nationwide each year.
The National Oceanic and Atmospheric Administration keeps records of tornado sightings. It says tornadoes kill eighty people and injure one thousand five hundred others nationwide in an average year.
Tornadoes are observed most often in the central part of the United States, where the land is mostly flat. The area where the most violent tornadoes usually happen is known as “Tornado Alley.” This area is considered to extend from north central Texas to North Dakota.
Tornadoes can happen any time of the year. But most happen from late winter to the middle of summer. In some areas, there is a second high season in autumn.
Tornado seasons are the result of wind and weather patterns. During spring, warm air moves north and mixes with cold air remaining from winter. In autumn, the opposite happens. Cold weather moves south and combines with the last of the warm air from summer.
Tornadoes can strike with little or no warning. Most injuries happen when flying objects hit people. Experts say the best place to be is in an underground shelter, or a small, windowless room in the lowest part of a building.
People driving during a tornado are told to find low ground and lay flat, facedown, with their hands covering their head. People in the path of a tornado often just have minutes to make life-or-death decisions.
The deadliest American tornado on record was the Tri-State Tornado of March
18, 1925. It tore across Missouri, Illinois and Indiana. About seven hundred people were killed.
A "tornado outbreak" is often defined as six or more tornadoes produced by the same weather system within a day. But the outbreak of April 3 and 4, 1974, set a national record. It is remembered as the "Super Outbreak." One hundred forty-eight tornadoes struck during a twenty-four-hour period. More than three hundred people were killed and nearly six thousand others injured.
No two tornadoes look exactly the same. And no two tornadoes act the same way. Even a weak tornado requires the right combination of wind, temperature,
pressure and humidity. Weather experts can identify these conditions. And, when
they observe them, they can advise people that tornadoes might develop. But they are not able to tell exactly where or when a tornado will hit. Tornado warnings still depend in large part on human observations.
Usually a community will receive a warning at least a few minutes before a tornado strikes. But each year there are some surprises where tornadoes develop when they are least expected.
The tornado reporting system involves watches and warnings. A tornado watch means tornadoes are possible in the area. A tornado warning means that a tornado has been seen. People are told to take shelter immediately.
Yet tornadoes can be difficult to see. Sometimes only the objects they are carrying through the air can be seen. Some night-time tornadoes have been observed because of lightning strikes nearby. But tornadoes at night are usually impossible to see.
Tornadoes that form over water are called waterspouts. But tornadoes cover a much smaller area than hurricanes, which form over oceans.
Tornadoes can be measured using wind speed information from Doppler radar systems. Tornadoes usually travel in a northeasterly direction with a speed of thirty-
two to sixty-four kilometers an hour. But they have been reported to move in other directions and as fast as one hundred seventeen kilometers an hour.
In the United States, the force of a tornado is judged by the damage to structures. Scientists inspect the damage before they estimate the severity of a tornado. They measure tornadoes on the Enhanced Fujita scale or the EF scale.
Ted Fujita was a weather expert who developed a system to rate tornados in the
1970s. The EF scale is a set, or collection, of wind estimates. They are based on levels of damage to twenty-eight different kinds of structures and other objects.
Tornadoes that cause only light damage are called an EF-zero. Those with the highest
winds that destroy well-built homes and throw vehicles great distances are called an
Some people make a sport out of watching and following tornadoes. They are called tornado chasers or storm chasers. Their work can be seen in the extreme weather videos that are increasingly popular on television and on the Internet.
Some chasers do it just because it is their idea of fun. Others do it to help document storms and warn the public. Still others are part of weather research teams.
Recently, an international team of scientists completed a tornado research project called VORTEX2. More than one hundred researchers traveled throughout America’s Great Plains in 2009 and 2010. They used weather measurement instruments to collect scientific information about the life of a tornado. The goal of the project was to examine in detail how tornadoes are formed and the kinds of damage they cause.
A film about the VORTEX2 project opened at some theaters in the United States last month. The film includes never before seen images of tornadoes. To safely capture up-close film footage of tornadoes, some project participants traveled in a seven-ton, armored tornado intercept vehicle directly into tornadoes as they formed.
The National Weather Service says the United States gets more severe weather than any other country. For one thing, it is also bigger than most other countries. And it has many different conditions that create many different kinds of weather. There are seacoasts and deserts, flatlands and mountains. The West Coast is along the Pacific Ocean, which is relatively calm. The East Coast is along the Atlantic Ocean, which is known for its hurricanes. These strike mainly the southeastern states.
3 COMPREHENSION CHECK
Decide whether these statements are TRUE or FALSE
1. Tornadoes are also known as twisters.
2. Tornadoes have been observed on every continent.
3. Today experts are able to tell exactly where or when a tornado will hit.
4. Tornadoes are known to cover a much bigger area than hurricanes
5. Tornado chasers make videos of extreme weather conditions to sell them on the Internet.
6. VORTEX2 scientific team contributed greatly to the tornado research in the
7. According to the National Weather Service the US gets the most severe weather in the world.
4 VOCABULARY AND GRAMMAR EXERCISES
1) Match the beginning of the phrases with their endings to make expressions from the text
2) Fill in the gaps with the appropriate forms of the words
5 FOLLOW UP ACTIVITIES
1. Research weather patterns in our region/country.
2. Write an article which covers the most severe weather condition in our region/country.