A tornado is a violent, dangerous, rotating column of air which is in contact with both the surface of the earth and a cumulonimbus cloud Cumulonimbus is a type of cloud that is tall, dense, and involved in thunderstorms and other intense weather. It is a result of atmospheric instability. These clouds can form alone, in clusters, or along a cold front in a squall line. They create lightning through the heart of the cloud. Cumulonimbus clouds form from cumulus clouds (namely from or, in rare cases, the base of a cumulus cloud Cumulus clouds are a type of cloud with noticeable vertical development and clearly defined edges. Cumulus means "heap" or "pile" in Latin. They are often described as "puffy" or "cotton-like" in appearance. Cumulus clouds may appear alone, in lines, or in clusters. Cumulus clouds are often precursors of. Tornadoes come in many sizes but are typically in the form of a visible condensation funnel A funnel cloud is a funnel-shaped cloud of condensed water droplets, associated with a rotating column of wind and extending from the base of a cloud but not reaching the ground or a water surface. A funnel cloud is usually visible as a cone-shaped or needle like protuberance from the main cloud base. Funnel clouds form most frequently in, whose narrow end touches the earth and is often encircled by a cloud of debris In geology, debris usually applies to the remains of geological activity including landslides, volcanic explosions, avalanches, mudflows or Jökulhlaups, lahars, and lava eruptions. Geological debris sometimes moves in a stream called a debris flow and dust Dust is a general name for minute solid particles with diameters less than 20 thou . Particles in the atmosphere arise from various sources such as soil dust lifted up by wind, volcanic eruptions, and pollution. Dust in homes, offices, and other human environments consist primarily of human skin cells, but also contain small amounts of plant.
Most tornadoes have wind speeds between 40 mph (64 km/h) and 110 mph (177 km/h), are approximately 250 feet (75 m) across, and travel a few miles (several kilometers The kilometre , symbol km is a unit of length in the metric system, equal to one thousand metres and is therefore exactly equal to the distance travelled by light in free space in 1⁄ 299,792.458 of a second) before dissipating. Some attain wind speeds of more than 300 mph (480 km/h), stretch more than a mile (1.6 km) across, and stay on the ground for dozens of miles (more than 100 km).[1][2][3]
Although tornadoes have been observed on every continent except Antarctica, the vast majority of tornadoes in the world occur in the United States The United States of America is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the, and specifically, in the Tornado Alley Tornado Alley is a colloquial term most often used in reference to the area of the United States in which tornadoes are most frequent. Although an official location is not defined, the areas in between the Rocky Mountains and Appalachian Mountains are the areas usually associated with it region of the country.[4] They also commonly occur in southern Canada Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean. It is the world's second largest country by total area and its common border with the United States to the south and northwest is the world's longest, south-central and eastern Asia, the Philippines The Philippines officially known as the Republic of the Philippines, is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. To its west across the South China Sea is Vietnam. The Sulu Sea to the southwest separates it from the island of Borneo and to the south the Celebes Sea from other, east-central South America, Southern Africa Southern Africa is the southernmost region of the African continent, variably defined by geography or geopolitics. Within the region are numerous territories, including the Republic of South Africa ; nowadays, the simpler term South Africa is generally reserved for the country in English, northwestern and southeast Europe, western and southeastern Australia, and New Zealand.[5]
