UW-Madison ATMOCN 100 - Extratropical and Tropical Cyclones (5 pages)

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Extratropical and Tropical Cyclones



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Extratropical and Tropical Cyclones

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A lecture about the fundamental differences between extropical cyclones and tropical cyclones.


Lecture number:
31
Pages:
5
Type:
Lecture Note
School:
University of Wisconsin, Madison
Course:
Atmocn 100 - Weather and Climate
Edition:
1
Documents in this Packet

Unformatted text preview:

Atm Ocn 100 Edition 1nd Lecture 31 Outline of Last Lecture I Reminders II Weather of the day III Tropical Cyclone vs Midlatitude or Frontal Cyclone IV Hurricane Tracks V Parts and Weather of a Hurricane VI Wind and Storm Movement VII Initiation of Tropical Cyclones VIII Easterly Waves Outline of Current Lecture II Reminder III Current Weather IV Basic reasons why Extratropical cyclones and Tropical cyclones exist V Extratropical and Tropical Cyclone Configurations VI Main Summary Points Current Lecture Reminder Homework due Wednesday Current Weather Now it is a 75 chance that there will be an El Nino There is heavy rain developing in the south near Texas There are many subtropical jets not polar jets which is odd Vorticity is the curl of the wind It represents how much spin there is in the wind On the map we are looking at the red means positive cyclonic vorticity This is because curvature of the flow and because there is a little shear in there The blue is low vorticity its positive curvature it probably has negative shear which would make it turn the other way We will get about an inch of rain this weekend More Tropical Cyclones Basic reasons why Extratropical cyclones and Tropical cyclone exist The difference for their existence is that they are two fundamentally different phenomena in the atmosphere The sun when it shines on the earth heats the surface and moistens the surface in the tropics This is more than when it heats the surface at the middle latitudes because it shines more directly on the surface of the tropics In the tropics this creates a thermal gradient between the supper atmosphere and the lower atmosphere By heating the surface it becomes conditionally unstable The result of the shine shining on the surface is to create thermals that go up and down that transfer heat to the upper levels When all the thermals like cumulus clouds get together and have a party that s a tropical cyclone It is a swirl of clouds releasing latent heat into the atmosphere



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