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Posted by weathergaines Many might wonder why there's no tropical cyclone at this point developing over WPAC to the point that Eastern Pacific already has 3 and Indian Ocean has 2 already with Atlantic already has 1 this month.... There are six main requirements for tropical cyclogenesis: 1. sufficiently warm sea surface temperatures. 2.Atmospheric instability 3.High humidity in the lower to middle levels of the troposphere 4.Enough Coriolis force to develop a low pressure center 5.A preexisting low level focus or disturbance 6.And low vertical wind shear. Basically at this point High vertical shear (averaging of up to 30kts with max of 60kts) contributes mainly despite of warm sea surface temperature for none formation of TC. Thunderstorms which occur in weak vertical wind shear usually have an erect appearance, thus if shear are high then most convection will deminish continuously. The vertical wind shear in a tropical cyclone's environment is also important. Wind shear is defined as the amount of change in the wind's direction or speed with increasing altitude. When the wind shear is weak, the storms that are part of the cyclone grow vertically, and the latent heat from condensation is released into the air directly above the storm, aiding in development. When there is stronger wind shear, this means that the storms become more slanted and the latent heat release is dispersed over a much larger area. To look for an actual vertical shear look for this site: http://cimss.ssec.wisc.edu/tropic/real-time/westpac/winds/wgmsshr.html
on June 16, 2007, 11:13 am
Message modified by board administrator June 16, 2007, 11:37 am
hi there...
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