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Cyclogenesis is the development or strengthening of cyclonic circulation in the atmosphere (a low-pressure area). [1] Cyclogenesis is an umbrella term for at least three different processes, all of which result in the development of some sort of cyclone , and at any size from the microscale to the synoptic scale .
Diagram of a cyclone in the early stages of occlusion in the Northern Hemisphere. In meteorology, an occluded front is a type of weather front formed during cyclogenesis.The classical and usual view of an occluded front is that it starts when a cold front overtakes a warm front near a cyclone, such that the warm air is separated (occluded) from the cyclone center at the surface.
Tropical cyclogenesis requires six main factors: sufficiently warm sea surface temperatures (at least 26.5 °C (79.7 °F)), atmospheric instability, high humidity in the lower to middle levels of the troposphere, enough Coriolis force to develop a low-pressure center, a pre-existing low-level focus or disturbance, and low vertical wind shear. [3]
A low-pressure area is a region where the atmospheric pressure at sea level is below that of surrounding locations. Low-pressure systems form under areas of wind divergence that occur in the upper levels of the troposphere. [1] The formation process of a low-pressure area is known as cyclogenesis. [2]
The formation process of a low-pressure area is known as cyclogenesis. In meteorology , atmospheric divergence aloft occurs in two kinds of places: The first is in the area on the east side of upper troughs , which form half of a Rossby wave within the Westerlies (a trough with large wavelength that extends through the troposphere).
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The change in pressure needed to classify something as explosive cyclogenesis is latitude dependent. For example, at 60° latitude, explosive cyclogenesis occurs if the central pressure decreases by 24 millibars (0.71 inHg) or more in 24 hours. [10] [11] This is a predominantly maritime, winter event, [10] [12] but also occurs in continental ...
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