Tornado - Wikipedia. A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.

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They are often referred to as twisters, whirlwinds or cyclones,[1] although the word cyclone is used in meteorology to name a weather system with a low- pressure area in the center around which winds blow counterclockwise in the Northern Hemisphere and clockwise in the Southern.[2] Tornadoes come in many shapes and sizes, and they are often visible in the form of a condensation funnel originating from the base of a cumulonimbus cloud, with a cloud of rotating debris and dust beneath it. Most tornadoes have wind speeds less than 1. The most extreme tornadoes can attain wind speeds of more than 3. Various types of tornadoes include the multiple vortex tornado, landspout and waterspout. Waterspouts are characterized by a spiraling funnel- shaped wind current, connecting to a large cumulus or cumulonimbus cloud. Watch Turner &Amp; Hooch Online (2017). They are generally classified as non- supercellular tornadoes that develop over bodies of water, but there is disagreement over whether to classify them as true tornadoes. These spiraling columns of air frequently develop in tropical areas close to the equator, and are less common at high latitudes.[6] Other tornado- like phenomena that exist in nature include the gustnado, dust devil, fire whirls, and steam devil.

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Tornadoes have been observed and documented on every continent except Antarctica. However, the vast majority of tornadoes occur in the Tornado Alley region of the United States, although they can occur nearly anywhere in North America.[7] They also occasionally occur in south- central and eastern Asia, northern and east- central South America, Southern Africa, northwestern and southeast Europe, western and southeastern Australia, and New Zealand.[8] Tornadoes can be detected before or as they occur through the use of Pulse- Doppler radar by recognizing patterns in velocity and reflectivity data, such as hook echoes or debris balls, as well as through the efforts of storm spotters. Watch Girl In Woods Putlocker# more. There are several scales for rating the strength of tornadoes.

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The Fujita scale rates tornadoes by damage caused and has been replaced in some countries by the updated Enhanced Fujita Scale. An F0 or EF0 tornado, the weakest category, damages trees, but not substantial structures.

An F5 or EF5 tornado, the strongest category, rips buildings off their foundations and can deform large skyscrapers. Watch Craigslist Joe Online Metacritic. The similar TORRO scale ranges from a T0 for extremely weak tornadoes to T1. Doppler radar data, photogrammetry, and ground swirl patterns (cycloidal marks) may also be analyzed to determine intensity and assign a rating.[1. A tornado near Anadarko, Oklahoma. The funnel is the thin tube reaching from the cloud to the ground.

The lower part of this tornado is surrounded by a translucent dust cloud, kicked up by the tornado's strong winds at the surface. The wind of the tornado has a much wider radius than the funnel itself. A tornado near Eads, Colorado.

Etymology. The word tornado is an altered form of the Spanish word tronada, which means "thunderstorm". This in turn was taken from the Latin tonare, meaning "to thunder".

It most likely reached its present form through a combination of the Spanish tronada and tornar ("to turn"); however, this may be a folk etymology.[1. A tornado is also commonly referred to as a "twister", and is also sometimes referred to by the old- fashioned colloquial term cyclone.[1. The term "cyclone" is used as a synonym for "tornado" in the often- aired 1. The Wizard of Oz. The term "twister" is also used in that film, along with being the title of the 1. Twister. Definitions. A tornado is "a violently rotating column of air, in contact with the ground, either pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud".[1.

For a vortex to be classified as a tornado, it must be in contact with both the ground and the cloud base. Scientists have not yet created a complete definition of the word; for example, there is disagreement as to whether separate touchdowns of the same funnel constitute separate tornadoes.[5]Tornado refers to the vortex of wind, not the condensation cloud.[1. Funnel cloud. This tornado has no funnel cloud; however, the rotating dust cloud indicates that strong winds are occurring at the surface, and thus it is a true tornado.

A tornado is not necessarily visible; however, the intense low pressure caused by the high wind speeds (as described by Bernoulli's principle) and rapid rotation (due to cyclostrophic balance) usually cause water vapor in the air to condense into cloud droplets due to adiabatic cooling. This results in the formation of a visible funnel cloud or condensation funnel.[1.

There is some disagreement over the definition of a funnel cloud and a condensation funnel. According to the Glossary of Meteorology, a funnel cloud is any rotating cloud pendant from a cumulus or cumulonimbus, and thus most tornadoes are included under this definition.[2. Among many meteorologists, the 'funnel cloud' term is strictly defined as a rotating cloud which is not associated with strong winds at the surface, and condensation funnel is a broad term for any rotating cloud below a cumuliform cloud.[5]Tornadoes often begin as funnel clouds with no associated strong winds at the surface, and not all funnel clouds evolve into tornadoes. Most tornadoes produce strong winds at the surface while the visible funnel is still above the ground, so it is difficult to discern the difference between a funnel cloud and a tornado from a distance.[5]Outbreaks and families.

Occasionally, a single storm will produce more than one tornado, either simultaneously or in succession. Multiple tornadoes produced by the same storm cell are referred to as a "tornado family".[2. Several tornadoes are sometimes spawned from the same large- scale storm system. If there is no break in activity, this is considered a tornado outbreak (although the term "tornado outbreak" has various definitions). A period of several successive days with tornado outbreaks in the same general area (spawned by multiple weather systems) is a tornado outbreak sequence, occasionally called an extended tornado outbreak.[1. Characteristics. Size and shape.

Most tornadoes take on the appearance of a narrow funnel, a few hundred yards (meters) across, with a small cloud of debris near the ground. Tornadoes may be obscured completely by rain or dust. These tornadoes are especially dangerous, as even experienced meteorologists might not see them.[2. Tornadoes can appear in many shapes and sizes. Small, relatively weak landspouts may be visible only as a small swirl of dust on the ground. Although the condensation funnel may not extend all the way to the ground, if associated surface winds are greater than 4. A tornado with a nearly cylindrical profile and relative low height is sometimes referred to as a "stovepipe" tornado.

Large single- vortex tornadoes can look like large wedges stuck into the ground, and so are known as "wedge tornadoes" or "wedges". The "stovepipe" classification is also used for this type of tornado if it otherwise fits that profile. A wedge can be so wide that it appears to be a block of dark clouds, wider than the distance from the cloud base to the ground. Even experienced storm observers may not be able to tell the difference between a low- hanging cloud and a wedge tornado from a distance. Many, but not all major tornadoes are wedges.[2. Tornadoes in the dissipating stage can resemble narrow tubes or ropes, and often curl or twist into complex shapes. These tornadoes are said to be "roping out", or becoming a "rope tornado".

When they rope out, the length of their funnel increases, which forces the winds within the funnel to weaken due to conservation of angular momentum.[2.