A nor'easter is a strong extratropical cyclone, usually experiencing bombogenesis. Extratropical cyclones, also known as winter storms, are a meteorologically complex hazard with highly variable regional manifestations. Formation [edit] Approximate areas of extratropical cyclone formation worldwide An upper-level jet streak. Formation of Fronts: Mid-latitude cyclones or Temperate cyclones have a converging counterclockwise circulation pattern in the Northern Hemisphere. While this formation occurs in many places around the world, nor'easters are unique for their combination of northeast winds and moisture content of the swirling clouds. Origin and Development of Temperate Cyclones Polar Front Theory According to this theory, the warm-humid air masses from the tropics … • Extratropical cyclones tend to develop with a particular lifecycle . This article talks about Temperate Cyclones. Extra-tropical Cyclone Characteristics A low-pressure centre, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of … The four stages in the life cycle of an extratropical cyclone are: (1) the initial state, (2) the incipient stage, (3) the mature stage, and (4) the occlusion stage. • An extratropical cyclone tends to focus the temperature contrasts into ‘fron-tal zones’ of particularly rapid horizontal temperature change. • The low pressure center moves roughly with the speed of the 500 mb wind above it. Climate - Climate - Extratropical cyclones: Of the two types of large-scale cyclones, extratropical cyclones are the most abundant and exert influence on the broadest scale; they affect the largest percentage of Earth’s surface. AIR models help you assess the risk, whether from a single storm or storms clustered in space and time, including the most extreme events. The formation of this rapidly strengthening weather system is a process called bombogenesis, which creates what is known as a bomb cyclone. Where does the energy to produce these strong upper-level winds come from in an extra-tropical cyclone? Extra-Tropical Cyclone Formation and Energy Source Cross-sections of the April 2007 Nor'easter Back to maps of the April 2007 Nor'easter Back to starting page. DIV areas are regions of divergence aloft, which will lead to surface convergence and aid cyclogenesis. This wind flow pattern brings together cool air from the north and warm air from the south. The systems developing in the mid and high latitude (35° latitude and 65° latitude in both hemispheres), beyond the tropics are called the Temperate Cyclones or Extra Tropical Cyclones or Mid-Latitude Cyclones or Frontal Cyclones or Wave Cyclones. Difference from other extratropical storms. However, the diagram represents graphically the life cycle of an extra­tropical cyclone in the northern hemis­phere. Temperate cyclones are also known as Extra-tropical cyclones where the term “Extra-tropical” signifies that this type of cyclone generally occurs outside the tropics with a latitude range between 30° and 60°.
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