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which of the following causes tornadoes

But archaeology is confirming that Persia's engineering triumph was real. It is a violently swirling column of air extending from a thunderstorm to the ground. 6.2M views 3 years ago #Tornadoes #Educational #NationalGeographic Tornadoes are some of the most destructive forces of nature. If your question is not answered below, check this excellent, comprehensive list of tornado FAQs from the NOAA Storm Prediction Center. And is there any way weather forecasters could give people right in their path a little more warning? of 105 g/L. As that happens, an updraft is created when the warm air rises. Statistically, tornadoes cause 1,500 injuries each year. IE reveals this too. A supercell is any thunderstorm with a mesocyclone (an updraft that rotates around a vertical axis) occupying its core. (405) 325-3620, NOAA National Weather Service Forecast Office, National Oceanic & Atmospheric Administration. The Fujita scale, or F-scale, measures the intensity of a tornado based on the damage it causes. Since tornadoes are basically air, they can be hard to spot until they create a condensation funnel of water droplets, dust, and debris. false. Additionally, if the wind shear is strong enough it can start the air rolling in what is called horizontal vorticity. , ar should Making the connection to tornadoes is the hardest of all.. Circumstantial evidence points to an increase in frequency, but its not a direct line of evidence, said Tippett. The 2013 El Reno tornado caused $3540 million worth of damage, killed 20 people, and was classified as an EF3 tornado. Rats invaded paradise. While every effort has been made to follow citation style rules, there may be some discrepancies. to people. Russia may have many tornadoes, but reports are not available to quantify their occurrence. Rare but deadly tornadoes have occurred in many other countries, including Bangladesh, China, and Argentina. In the United Kingdom almost all reported tornadoes are associated with vigorous convection occurring in advance of and along a cold frontal boundary. The widesttornado ever recorded was a multiple-vortex tornado. 120 David L. Boren Blvd. Between April and June 2011 tornadoes killed more than 580 people and caused over $21 billion dollars in economic damages. Depending on their proximity to populated areas and structures, this destructive weather phenomenon has the potential to cause significant damage and disruption to communities. -Florida has the most thunderstorms. It's hard to measure the winds in a tornado directly. All rights reserved. your question says of the following but their isn't any of the following ): But other than than that person right up above, This site is using cookies under cookie policy . April 2011 set the U.S. record for the most tornadoes in any month. A tornado is a violently rotating column of air that extends from a thunderstorm to the ground. It seems all very willy-nilly and makes you wonder why them and not us? Or, just why us?. There were 1,706 confirmed tornadoes that caused 553 deaths and about $25 billion in damages, with the Southeast (e.g., Alabama) hit the hardest. Fair-weather waterspouts occur in coastal waters. Also known as twisters, tornadoes are born in thunderstorms and are often accompanied by hail. Most tornadoes last for less than ten minutes, says Harold Brooks, a research meteorologist with the National Oceanic and Atmospheric Administration's (NOAA) National Severe Storms Laboratory (NSSL) in Norman, Oklahoma. This article describes tornado occurrence and formation as products of instability within the Earths air masses and wind systems. The National Weather Service introduced a scale known as the "Enhanced Fujita Scale" in 2007 to "score" tornadoes based on the damage a tornado caused. https://www.britannica.com/science/tornado, NOAA National Severe Storms Laboratory - Severe Weather 101 - Tornadoes, tornado - Children's Encyclopedia (Ages 8-11), tornado - Student Encyclopedia (Ages 11 and up), Tornado flips cars, damages homes in coastal Florida city, 'The damage is unbelievable:' Tornadoes kill 3 in Oklahoma, Teenagers in love among 5 lives lost in Missouri tornado, Was your home damaged in a tornado? *This scale was implemented as the standard scale of tornado intensity for the United States on February 1, 2007. The tornado was large, powerful, and traveled along the ground for many kilometers. For short, descriptive entries on closely related phenomena not covered in this article, see waterspout, whirlwind, and fire storm. The strong, intense tornadoes tend to last longer. Wind speeds in tornadoes can rip ordinary homes to shreds[+], There have been reports of tornadoes blowing dirt and creating a trench 3 feet deep, but it is very uncommon. The atmosphere has more fuel in it now, both in terms of heat and moisture. Certain conditions make tornadoes more likely. As the rotating updraft draws in more warm air from the thunderstorm, its rotation speed increases. The average width of a tornado is about 300 feet, but some can be as wide as 2.5 miles. Wind shear is a change in wind direction or speed over a short distance. With most weather events, even hurricanes, you know what to expect. Last month, a tornado in rural Mississippi devastated mobile . Almost all tornadoes create physical damage. The loss of a home or personal belongings can be traumatic, and rebuilding and recovering from a tornado can be financially burdensome. Sign up to keep reading and unlock hundreds of Nat Geo articles for free. In absolute numbers, the United States has the most tornadoes by far (more than 1,000 per year have been reported every year since 1990). Inside thunderclouds, warm, humid air rises, while cool air falls--along with rain or hail. 'Tornadic waterspouts,'often known as 'tornadoes over water,'can be created by supercell thunderstorms in a manner that is the same as land-based tornadoes- except they just happen over water. Tornadoes form when warm, humid air collides with cold, dry air. We also cover the various typesof tornadoes and what happens when one strikes. Click here to download this video (1920x1080, 139 MB, video/mp4). An unstable atmosphere is one in which the air is prone to rising and falling quickly. When the jet stream is strong and moves in the right direction, it can push the warm, moist air and cold, dry air together, creating the conditions needed for a tornado to form. Watch this video to learn about tornadoes! Learn how tornadoes form, how they are rated, and the country where the most intense tornadoes occur. Subscribe: http://bit.ly/NatGeoSubscribe#NationalGeographic #Tornadoes #EducationalAbout National Geographic:National Geographic is the world's premium destination for science, exploration, and adventure. That is what happened when a series of . These violent storms occur around the world, but the United States is a major hotspot with about a thousand tornadoes every year. Create Your Free Account or Sign In to Read the Full Story. replacing your wooden front door with a door made of glass For example, the passage of a very strong frontal boundary across the United Kingdom on November 23, 1981, produced 105 documented tornadoes. The five largest US winter tornado outbreaks have all hit since 1999. Records of tornado occurrences are fragmentary for many areas, making estimates of global tornado frequency difficult. The history of book bansand their changing targetsin the U.S. Here is a scale meteorologists use to describe tornado intensity based on damage. Tornadoes can reach wind speeds of more than 300 miles per hour. You live in Florida, and you have decided to prepare your home for hurricane season. Tornadoes have been known to strip asphalt pavement. This area is known as 'Tornado Alley,' and it includes Texas, Oklahoma, South Dakota, Louisiana, Kansas, Nebraska, and Iowa. Inside the huge thundercloud, warm and humid air is rising, while cool air is falling, along with rain or hail. All you need to know about 4 types of clouds, How much of the ocean has been explored? (a) Inside thunderclouds, warm, humid air rises, while cool air falls--along with rain or hail. Imagery from GOES-13 enabled weather forecasters to foresee the trouble that was about to hit Alabama. This separates the updraft and downdraft of the thunderstorm, preventing them from interfering with one another. They can be more than two miles (3.2, Copyright 1996-2015 National Geographic SocietyCopyright 2015-2023 National Geographic Partners, LLC. They are also better at understanding what's actually going on inside the cloud: what characteristics the cloud has that indicate a severe storm and how much lightning it produces. According to the American Meteorological Society, maximum tornado frequency follows the sun, the mid-latitude jet stream, and northward pushing maritime tropical air. Powerful tornadoes barrelled through five US states on Friday, levelling houses and factories and bringing down power lines. In Kentucky, the worst-hit state, one tornado alone followed an extraordinarily long and destructive path of more than 200 miles. rare cases, tornadic winds can reach over 300 mph. All rights reserved, Do Not Sell or Share My Personal Information. Want the full story? It was really a late spring type of setup in in the middle of December, Northern Illinois University meteorology professor Victor Gensini told Associated Press. Although this spinning column of air starts out horizontal, it can easily go vertical and drop down out of the cloud. STDs are at a shocking high. When this happens, the thunderstorm may start rotating. Copyright 1996-2015 National Geographic Society, Copyright 2015-2023 National Geographic Partners, LLC. In addition to physical damage, tornadoes can also have serious emotional and financial impacts on those affected. The denser cold air is pushed over the warm air, usually producing thunderstorms. The scale ranges from F0 (minor) to F5 (incredible). Tornadic waterspouts would also include a tornado that crosses from land to water. Create an account to read the full story and get unlimited access to hundreds of Nat Geo articles. But when a tornado falls outside the norm and collides with humans, it can cause severe damage and even death. When a cold front moves into an area with warm, moist air, it can create the conditions needed for a tornado to form. The little-known history of the Florida panther. This struckEl Reno, Oklahoma, on May 31, 2013, and is notable for claiming the lives of four tornado chasers- the first known deaths in storm-chasing history. They do not connect with any cloud-base rotation and are not tornadoes, but because gustnadoes often have a spinning dust cloud at ground level, they are sometimes wrongly reported as tornadoes. When winds of this magnitude strike a populated area, they can cause vast destruction and great loss of life, mainly through injuries from flying debris and collapsing structures. The first result is a large thunderstorm. GOES-R series satellites will be better at seeing what's actually going on inside the cloud: how much lightning it produces, cloud top properties and the motion of the clouds. Which of the following actions would least help you achieve your goal? The EF-Scale takes into account more variables than the original Fujita . Answer: The correct answer is option A, Wind Shear Explanation: The tornadoes are formed from the fast rotating air which develops into a funnel shape. Most tornadoes last for less than ten minutes, says Harold Brooks, a research meteorologist with the National Oceanic and Atmospheric Administration's (NOAA) National Severe Storms Laboratory. These are wind storm is meant to be twister, whirl wind and cyclone. The El Reno multi-vortex tornado, Oklahoma, U.S. A tornadic watersprout, Punta Gorda, Florida, U.S. Each year about 56 people are killed by tornadoes. When the atmosphere is unstable, it is more likely that a tornado will form. Does eating close to bedtime make you gain weight? We have circumstantial evidence, yes, but the key caveat is that favourable conditions do not guarantee that a storm occurs, Tippett said. This spinning air turns into a tornado when it comes into contact with the ground. . Will it ever leave? Oklahoma. Although the largest and deadliest tornadoes occur in supercell thunderstorms, many tornadoes also occur in non-supercell clouds and storms. In this article, Interesting Engineering (IE) explores what tornadoes are and the factors contributing to their formation. Each value is converted from miles per hour and rounded to the nearest whole number. The Short Answer: A tornado forms from a large thunderstorm. Many reports come from New South Wales, where there were 173 reported tornadoes from 1901 to 1966. A) condensation B) dry climates C) wind shear D) stationary fronts Get the answers you need, now! They write new content and verify and edit content received from contributors. This ancient marvel rivaled Romes intricate network of roads, For some long COVID patients, exercise is bad medicine, Radioactive dogs? These tornado are found to occuring in many shapes and size with formation of condensation funnel. A tornado, or twister, is a rapidly rotating column of air that stretches from clouds at the base of a thunderstorm to the ground. The winds inside the spinning column of some tornadoes are the fastest of any on Earth. They can be the most potent and destructive tornado type and are characterized by strong rotating updrafts. Get a Britannica Premium subscription and gain access to exclusive content. Where do these violent and unpredictable storms come from? It also has the most violent tornadoes, about 10 to 20 per year. These powerful storms can cause significant damage to buildings, homes, and infrastructure and disrupt essential services such as electricity and water. A typical lifetime for strong tornadoes is about eight minutes, while violent ones last about 25 minutes. If you were lucky, you and your family had a few seconds to find some shelter where you would not be picked up by the violent winds or seriously injured by large chunks of flying debris. Watch on the NOAA Weather Partners YouTube Channel, Compare this diagram of a thunderstorm with the next photo. Tornadoes occur most often in association with thunderstorms during the spring and summer in the mid-latitudes of both the Northern and Southern Hemispheres. Punta Gorda Police Department/Wikimedia Commons. [+], A gustnado is a small and usually weak whirlwind which forms as an eddy in thunderstorm outflows. Severe ones can also have emotional and financial impacts on those affected. The most powerful twisters have wind speeds of more than 300 miles (483 kilometers) per hour, which can rip buildings off their foundations. We discuss the meteorological conditions that must be present for a tornado to occur. Police and fire stations in Mayfield were destroyed, homes were flattened or lost roofs, giant trees were uprooted and street signs mangled. To save chestnut trees, we may have to play God, Why you should add native plants to your garden, What you can do right now to advocate for the planet, Why poison ivy is an unlikely climate change winner. forest fires, hurricanes, & tornadoes, No. In other words, a tornado is a funnel-shaped violent windstorm that whirls upwards rapidly with a tip touching the ground. 420 g Source: Modified from the Enhanced F Scale for Tornado Damage web page (http://www.spc.noaa.gov/efscale/ef-scale.html), produced by the National Oceanic and Atmospheric Association (NOAA). So, in that way, they are somewhat predictable. While scientists know the specific meteorological conditions needed for tornadoes to form, they are still researching exactly what triggers a tornado. This horizontal vorticity can then be turned vertical by a thunderstorm's updraft. Tornadoes are caused by the interaction of weather systems, which create large thunderstorms (the most powerful and long-lived type is called a supercell). . Some tornadoes are small and weak, while others are large and destructive. Please refer to the appropriate style manual or other sources if you have any questions. One minute it's just raining or hailing, and the next minute the roof or even the whole house is gone. The winds created by the growth and motion of these storms may create vortices (funnel clouds) that can descend to reach the ground, and move along the ground as tornadoes. Click here to download this video (1920x1080, 139 MB, video/mp4). Below, you can find some interesting tornado facts: Tornadoes are powerful swirling storms of violent air and can cause severe damage. reading assignment ch 10 #1. Most tornadoes are weak, lasting only about two to three minutes on average. Copyright 1996-2015 National Geographic Society, Copyright 2015-2023 National Geographic Partners, LLC. Explanation: The denser cold air is pushed over the warm air, usually producing thunderstorms. Although most tornadoes cause minimal injuries and fatalities, two tornado outbreaks in 2022 made NOAA's annual list of billion-dollar disasters, and both of those events happen in the spring. Tornadoes form when a mesocyclone, a part found in some They have been clocked at over 300 miles per hour! The Moon keeps drifting away from Earth. A tornado is a "rapidly rotating column" of air which is in the contact with both the surface of "earth and cumulonibus cloud". The violent nature of tornadoes can cause severe injuries and lead to loss of life. When it touches, it goes even darker as its ferocious whirling winds pick up dust, debris, andif the windspeeds are fast enoughcows, cars, roofs, mobile homes, trees, and anything else not well-anchored in the ground. Rats invaded paradise. (b) Create an account to read the full story and get unlimited access to hundreds of Nat Geo articles. Jennifer Francis, a senior scientist at Woodwell Climate Research Center, said climate change was making some of the ingredients needed to create an outbreak like this more likely. This ancient marvel rivaled Romes intricate network of roads, For some long COVID patients, exercise is bad medicine, Radioactive dogs? Biden has separately announced that he will ask the Environmental Protection Agency to examine what role climate change might have played in the storms. Answer: Tornadoes form when warm, humid air collides with cold, dry air. There are few tornado reports from either the Arctic or the equatorial tropics. Monette Manor Nursing Home (top) in Monette, Arkansas, and before the tornado on February 22, 2021. 2 hours of sleep? - One person was reported dead at the nursing home. So they are evaluated by the amount of damage they do. Sometimes the spinning column of air lifts off the ground, then touches down again some distance along its path. Ted Clifford. A tornado warning means that.? Heavy, dark clouds hang low, dumping buckets of rain and hail. A tornado is a narrow, violently rotating column of air that extends from a thunderstorm to the ground. Norman, OK 73072 What we can learn from Chernobyl's strays. Some scientists have been able to establish that the number of tornadoes in large outbreaks is on the rise and that the weather environments that produce severe storms are occurring more often. U.S. tornadoes cause 80 deaths and more than 1,500 injuries per year. Learn how tornadoes form, how they are rated, and the country. Create Your Free Account or Sign In to Read the Full Story. The average forward speed of a tornado is about 10 to 20 miles per hour. The updraft will begin to rotate if winds vary sharply in speed or direction. causes thunderstorms. Thunderstorms occur when denser, drier cold air is pushed over . All these measurements affect how likely the cloud is to produce a tornado. Averagely, 80 deaths as a result of devastating tornadoes are recorded each year. These precise windspeed numbers were guesses and have not been verified in science or engineering. Nature is unapologetically beautiful, with a tendency to get cruel from time to time. Opening windows during a tornado helps to balance air pressure and causes less damage. These satellites can more quickly monitor the motion of clouds to identify a severe storm as soon as it develops. In The term "non-tornadic" or "fair-weather waterspouts" refers to the vast majority of waterspouts, which are not connected to a supercell thunderstorm's revolving updraft. Without a thorough engineering analysis of tornado damage in any event, the actual wind speeds needed to cause that damage are unknown. Updates? Let us know if you have suggestions to improve this article (requires login). How this animal can survive is a mystery. Canada reports the second largest number of tornadoes (about 80 to 100 annually). To save chestnut trees, we may have to play God, Why you should add native plants to your garden, What you can do right now to advocate for the planet, Why poison ivy is an unlikely climate change winner. One of the reasons why tornado frequency is lower in Europe than in North America is east-west trending mountains inhibit the clash of warm and cold air For the U.S. as a whole, thunderstorm activity is most intense in July Which state, as a whole, experiences the highest frequency of thunderstorms in the U.S.? Who buys lion bones? he use? These figures point to the fact that tornadoes are life-threatening phenomenon that must be treated as a national disaster . GOES-16 imagery of a tornado-producing storm in southwest Iowa on June 28, 2017. USA These conditions can cause spinning air currents inside the cloud. These whirling atmospheric vortices can generate the strongest winds known on Earth: wind speeds in the range of 500 km (300 miles) per hour have been measured in extreme events. At least six people died in an Amazon distribution centre in Edwardsville in Illinois that was badly damaged. Weather Briefly: Tornadoes. The warm air rises through the colder air, causing an updraft. A strong tornado can pick up massive objects like trucks and drop them many miles away. The preparedness guide for thunderstorms, tornadoes and lightning suggests the following safety rules for tornadoes: Move to an underground shelter, basement or safe room. OR -Thunderstorms are common in the central and southern United States. Tornado cyclones, tornado families, and long-track tornadoes, The tornado core and the condensation funnel, 16 Questions About Earths Atmsophere and Weather Answered. You can specify conditions of storing and accessing cookies in your browser, How do nonpolar molecules dissolve in nonpolar solvents? the United States has more tornadoes than any other country in the world The signal detected by a Doppler radar is a radio wave reflected by precipitation Lightning may occur: all of these A line of thunderstorms that forms ahead of an advancing cold front is called a squall line In 2011, Alabama was struck particularly hard, with tornadoes rated EF-5 (the most intense) on the Enhanced Fujita scale hitting Hacklesburg and Birmingham. Which storm commonly has wind speeds up to 300 mph? Most Southern Hemisphere tornadoes occur in Australia. Each level in the Enhanced Fujita Scale is derived from three-second wind gusts estimated at the point of damage to 28 indicators (such as trees, buildings, and various types of infrastructure) and the degree of damage to each indicator. The rotation is especially strong in an updraft called a mesocyclone. A jet stream is a fast-moving current of air that flows high in the atmosphere. The updraft will begin to rotate if winds vary sharply in speed or direction. Rare but deadly tornadoes have occurred in many other countries, including Bangladesh, China, and Argentina. Scientists have been wary of attributing the frequency and intensity of convective storms that can produce tornadoes to climate change, in part because historical and observational data around tornadoes is relatively limited. If the storm intensifies rapidly enough, a relatively warm downdraft called a rear-flank downdraft or RFD can wrap around the bottom part of the mesocyclone. Feel free to improve my answer:). A landspout is a tornado with a small, rope-like condensation funnel similar to that of waterspouts that develops while the thunderstorm cloud is still forming. These conditions can cause spinning air currents inside the cloud. All rights reserved. The most deadly tornado in recent years occurred in 2011, when a storm that tore through Joplin, Mo., killed more than 150 people. The formation of tornadoes is complicated. It depends. We thought we knew turtles. How tornadoes form and how they die is not fully understood, yet scientists probing those mysteriesand aiming to improve warning systemshave pinpointed key risk factors. [+], The biggest threat to living creatures (including humans) from tornadoes is from flying debris and from being tossed about in the wind. Wind estimates vary with height and exposure. Please be respectful of copyright. A new discovery raises a mystery. The rating scale for tornadoes is based entirely on the damage they cause. This allows the storm to become stronger and last longer. Tornadoes form in unusually violent thunderstorms when there is sufficient (1) instability and (2) wind shear present in the lower atmosphere. Communities in five US states are picking up the pieces after a barrage of twisters. Please be respectful of copyright. A wedge tornado is characterized by a large, broad, relatively low-hanging funnel cloud that appears wedged into the ground. Only one ancient account mentions the existence of Xerxes Canal, long thought to be a tall tale. A gas leak has closed part of a road by the University of South Carolina campus in the downtown Columbia area Wednesday morning, officials said. If it is In contact with the ground it is a tornado; otherwise it is a funnel cloud. Scattered thunderstorms are possible Saturday . Some of the most common causes of a tornado include the following: Tornadoes need a source of warm, moist air to feed on. Tornadoes have been reported on all continents except Antarctica. Which of the following causes tornadoes? d) the thunderstorm has very strong updrafts causing the cloud to grow into the stratosphere. Giant, persistent thunderstorms called supercells spawn the most destructive tornadoes. Alcohol-free bars, no-booze cruises, and other tools can help you enjoy travel without the hangover. **Like the Fujita Scale, the Enhanced Fujita Scale is a set of wind estimates (not measurements of wind at the surface). (d) How this animal can survive is a mystery. 420 g/L Tornadoes are whirling, vertical air columns that form from thunderstorms and stretch to the ground and travel with ferocious speed. Who buys lion bones? Tornadoes are associated with violent and destructive windstorms occurring over land characterized by a funnel-shaped cloud extending towards the ground. The weather forecast will give you a few hours' warning and some idea of what is coming. When it touches the ground, it's a tornado . Also known as twisters, tornadoes are born in thunderstorms and are often accompanied by hail. In addition, South Africa and Argentina both reported 191 tornadoes from 1930 to 1979. (modern). Alcohol-free bars, no-booze cruises, and other tools can help you enjoy travel without the hangover. Florida (405) 325-3620, this excellent, comprehensive list of tornado FAQs, your local National Weather Service Office, Mobile Home Danger (NOAA Storm Prediction Center), Mobile Homes and Weather: Left to the Elements (WeatherZine), Federal Emergency Management Agency website, National Oceanic & Atmospheric Administration. However, tornadoes can occur in any state. Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. cool, dry air meeting with warm, moist air (APEX). A new discovery raises a mystery. By subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time. Heres how paradise fought back. This time there was. , osphere pressure when the gas was collected. Unauthorized use is prohibited. Corrections? Two people were killed and others were injured and trapped at the Monette Manor nursing home in Arkansas. Calculating which country has the most tornadoes per year depends on how this measurement is defined. About 20 tornadoes are reported in Australia each year, though the actual number is likely much higher. // have a great day // Advertisement Thunderstorms occur when denser, drier cold air is pushed over warmer, humid air, conditions scientists call atmospheric instability. Many storms occur in uninhabited areas, and so any tornadoes that they produce are undocumented. The greatest threat from tornadoes is typically in spring and summer, and although tornadoes can happen at any time of the year in the US, it is incredibly rare for twisters as destructive as those that struck on Friday to occur in December. There are few tornado reports from either the Arctic or the equatorial tropics. Tornadoes are most common on continents in the midlatitudes (between 20 and 60 degrees north and south), where they are frequently associated with thunderstorms that develop in regions where cold polar air meets warm tropical air. 2 hours of sleep? Inside South Africas skeleton trade. Giant, persistent thunderstorms called supercells spawn the most destructive tornadoes. In simple terms, thats due to fact that tornadoes are relatively small and can easily go unreported, said Michael Tippett, a professor of applied mathematics at Columbia University. The United Kingdom has the most tornadoes per land size, most of them weak. All these measurements affect how likely the cloud is to make tornadoes, and what kind of tornadoes it could produce. The greatest danger from tornadoes to people is wind-borne flying debris. On average, the U.S. gets about 1000 tornadoes each year. They can cause significant damage to structures and vegetation. . All rights reserved. Severe weather is in the forecast for parts of the Midlands Saturday night into Sunday morning, the National Weather Service said. How bad were the US tornadoes and what caused them? The history of book bansand their changing targetsin the U.S.

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which of the following causes tornadoes

which of the following causes tornadoes


which of the following causes tornadoes