UW-Madison ATMOCN 100 - More on Tropical Cyclones (5 pages)

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More on Tropical Cyclones

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More on Tropical Cyclones


A lecture continuing information about tropical cyclones.

Lecture number:
Lecture Note
University of Wisconsin, Madison
Atmocn 100 - Weather and Climate
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Atm Ocn 100 Edition 1nd Lecture 32 Outline of Last Lecture I Reminder II Current Weather III Basic reasons why Extratropical cyclones and Tropical cyclones exist IV Extratropical and Tropical Cyclone Configurations V Main Summary Points Outline of Current Lecture II Weather of the day III Some Review IV Hurricane Structure Current Lecture Wednesday class is optional it is a review session Today we will be finishing tropical cyclones Weather of the day There is a strong pressure system over Southern Canada We can see that there is a lot of precipitation here today Based on the fact that that there is a yellow line or the 540 thickness line is off to the east but is affecting us a lot It is going to keep snowing pretty much all day today This snow will not end till 3 am tomorrow morning We should expect about 2 3 inches of snow but could be more This morning said we could get up to 5 inches of snow Extratropical cyclones derive energy from a thermal contrast The low is made up of two air currents one going over the top and curving and another one from the north curving underneath As the cold air sinks downward it forms a vacuum above As it falls it lowers the pressure above which sucks in warm air When cold air is next to warm air the cold air falls and then produces pressure that sucks warm air The warm fluid is drawn over the top there is a sucking upward to bring in more air from behind As warm air over the cold air it is drawing air up from the south to fill void The low pressure is really an illustration of the sucking or low pressure The low pressure sucks warm air so it can rise Looking at warm air rising over the top of a falling cold air wedge A question about this is why does this occur in a small low pressure system that s rotating Some Review Why doesn t cold air everywhere slide to the south and then warm air go to the top of it What prevents that It has to do this in the form of extratropical cyclones because coriolis on the large scale holds that cold

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