Although researched for about 140 years and intensively for around 60 years, there are still aspects of tornadoes which remain a mystery. , A waterspout is defined by the National Weather Service as a tornado over water. A tornado is also commonly referred to as a "twister" or the old-fashioned colloquial term cyclone. During this stage the shape of the tornado becomes highly influenced by the winds of the parent storm, and can be blown into fantastic patterns. The RFD also focuses the mesocyclone's base, causing it to draw air from a smaller and smaller area on the ground. If no sturdy shelter is nearby, getting low in a ditch is the next best option. Unless the tornado is far away and highly visible, meteorologists advise that drivers park their vehicles far to the side of the road (so as not to block emergency traffic), and find a sturdy shelter.  Unsettled conditions and weather fronts transverse the British Isles at all times of the years, and are responsible for spawning the tornadoes, which consequently form at all times of the year.  In Europe, several nations are organizing spotter networks under the auspices of Skywarn Europe and the Tornado and Storm Research Organisation (TORRO) has maintained a network of spotters in the United Kingdom since 1974. How Winter Fashion Has Changed in 100 Years (PHOTOS), Eerie Vintage Photos of People Battling the Flu.  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. , Some countries have meteorological agencies which distribute tornado forecasts and increase levels of alert of a possible tornado (such as tornado watches and warnings in the United States and Canada). In the middle latitudes, where most tornadoes of the world occur, the Rocky Mountains block moisture and buckle the atmospheric flow, forcing drier air at mid-levels of the troposphere due to downsloped winds, and causing the formation of a low pressure area downwind to the east of the mountains. 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. , Unlike audible signatures, tornadic signatures have been isolated; due to the long-distance propagation of low-frequency sound, efforts are ongoing to develop tornado prediction and detection devices with additional value in understanding tornado morphology, dynamics, and creation. In many cases, intense tornadoes and thunderstorms exhibit an increased and anomalous dominance of positive polarity CG discharges. More often than not, overall cloud-to-ground (CG) lightning activity decreases as a tornado touches the surface and returns to the baseline level when the tornado dissipates. Tornadoes are storm systems that form on land due to pressure differences. 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. This unique topography allows for frequent collisions of warm and cold air, the conditions that breed strong, long-lived storms throughout the year. , Solar storms similar to tornadoes have been recorded, but it is unknown how closely related they are to their terrestrial counterparts. , Storm spotters are trained to discern whether or not a storm seen from a distance is a supercell. Tornadogenesis is most likely at the interface of the updraft and rear flank downdraft, and requires a balance between the outflow and inflow. Most intense tornadoes (EF3 to EF5 on the Enhanced Fujita Scale) develop from supercells. The difference between a cyclone and a tornado is much more than whether they just occur over land or water. It can be very violent and destructive as it moves across land in a fairly narrow path, usually a few hundred yards in width. , The United Kingdom has the highest incidence of tornadoes per unit area of land in the world.  Electromagnetics and lightning have little or nothing to do directly with what drives tornadoes (tornadoes are basically a thermodynamic phenomenon), although there are likely connections with the storm and environment affecting both phenomena. They occur most commonly in the Florida Keys and in the northern Adriatic Sea. The convergence of warm air in the updraft and cool air causes a rotating wall cloud to form.  Tornadoes are focused in the right front quadrant of landfalling tropical cyclones, which tend to occur in the late summer and autumn. A tornado is a violent windstorm characterised by a twisting, funnel-shaped cloud. The same tornado, viewed with the sun at the observer's back, may appear gray or brilliant white. A tornado that affected Hallam, Nebraska on May 22, 2004, was up to 2.5 miles (4.0 km) wide at the ground, and a tornado in El Reno, Oklahoma on May 31, 2013 was approximately 2.6 miles (4.2 km) wide, the widest on record. This cyclone, which was one of the most powerful in the cyclonic history in Bay of Bengal, caused terrible cyclonic conditions and a storm surge in the areas directly crossed by the core of the cyclone. ", "Fact or Fiction? On the other hand, tornado develops over land. Tornadoes occurring in these conditions are especially dangerous, since only weather radar observations, or possibly the sound of an approaching tornado, serve as any warning to those in the storm's path. Temperature tends to decrease and moisture content to increase in the immediate vicinity of a tornado.. An F5 or EF5 tornado, the strongest category, rips buildings off their foundations and can deform large skyscrapers. Tornado. In addition to tornadoes, very heavy rain, frequent lightning, strong wind gusts, and hail are common in such storms. There is mounting evidence, including Doppler on Wheels mobile radar images and eyewitness accounts, that most tornadoes have a clear, calm center with extremely low pressure, akin to the eye of tropical cyclones. Use up and down arrows to change selection.  Tornadoes' opposite phenomena are the widespread, straight-line derechoes (/dəˈreɪtʃoʊ/, from Spanish: derecho [deˈɾetʃo], "straight").  NOAA's has a higher average 100 per year in Canada. , Tornadoes vary in intensity regardless of shape, size, and location, though strong tornadoes are typically larger than weak tornadoes.  By recognizing these radar signatures, meteorologists could detect thunderstorms probably producing tornadoes from several miles away. , Since many tornadoes are audible only when very near, sound is not to be thought of as a reliable warning signal for a tornado.  There are observed correlations between tornadoes and patterns of lightning. A tornado often occurs as this happens or shortly afterwards; first, a funnel cloud dips and in nearly all cases by the time it reaches halfway down, a surface swirl has already developed, signifying a tornado is on the ground before condensation connects the surface circulation to the storm. However, they form under clear skies and are no stronger than the weakest tornadoes. Occasionally, the old (occluded) mesocyclone and the new mesocyclone produce a tornado at the same time.  Waterspouts and tornadoes have been advanced as an explanation for instances of raining fish and other animals. 9 Ways to Tell the Difference. However, they can, on occasion, result in major damage. They originate near the equator, around 10 degrees away from it, in the sea. After briefly becoming Captain, his eyes turned dark. Cyclone vs Tornado. Various types of tornadoes include the multiple vortex tornado, landspout, and waterspout. , Tornadoes normally rotate cyclonically (when viewed from above, this is counterclockwise in the northern hemisphere and clockwise in the southern). A tornado is an air column rotating at immense speeds that is in contact with the earth’s surface and a cumulonimbus cloud. An F0 or EF0 tornado, the weakest category, damages trees, but not substantial structures. These spiraling columns of air frequently develop in tropical areas close to the equator and are less common at high latitudes. Waterspouts and landspouts share many defining characteristics, including relative weakness, short lifespan, and a small, smooth condensation funnel which often does not reach the surface. 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