UW-Madison ATMOCN 100 - Air Masses and Fronts and Extratropical Cyclones (5 pages)

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Air Masses and Fronts and Extratropical Cyclones



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Air Masses and Fronts and Extratropical Cyclones

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A lecture finishing up air masses and fronts and then discussing extratropical cyclones.


Lecture number:
34
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 34 Outline of Last Lecture I Review about Difference between Extratropical Cyclones and Tropical Cyclones Outline of Current Lecture II Reminders III Weather of the day IV Air Masses and Fronts a Illustration of different fronts V Extratropical Cyclones Current Lecture Reminders Homework due this Friday Cloud Project due December 14 Final is 2 weeks from today Review Friday next week Weather of the day It is pretty nice outside It looks like it is going to be nice for a while It is related to movement into a zonal pattern We have some cold air coming in though We are in the middle of the gradient as you spread out We will be in the middle of a high pressure system by midnight tonight We would expect for the weather to be clear skies with calm wind What is causing rain on the map We can see the thickness line or the mean temperature of the lower troposphere There is a wedge of cold air stationary along the gulf coast that is slanting upward and to the north The low pressure is drawing air up The wedge of cold air on the surface and the low pressure has circulation associated with it the air is raising semi parallel to the isobars As air progresses upward it is lifted and cools until it reaches cloud base and then it condenses water into precipitation forming ice aloft that then falls to the surface through the cold air and produces the rainfall Rainfall that is shown on the map is rainfall over the past 12 hours Precipitation with these systems is from lifting of air over fronts The fronts are the boundarys between the warm and the cold air Warm air is like a ramp air is driven up the ramp and the ramp is indicated by the radiant or decreasing thickness as you go north This means that air getting colder as you go north Does the low we are looking at have a warm front There is not a warm front drawn on the map The front is indicated on the map it is the boundary where the cold air reaches the surface There is a strong gradient of



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