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Fronts - PowerPoint PPT Presentation


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Fronts. Definition (Glossary of Meteorology). Front: …generally the interface or transition zone between two air masses of different density.

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PowerPoint Slideshow about 'Fronts' - ishmael-tyson


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Presentation Transcript
slide2

Definition (Glossary of Meteorology)

Front: …generally the interface or transition zone between two air masses of different density

Air Mass: …a widespread body of air that is approximately homogeneous in its horizontal extent, particularly with reference to temperature and moisture distribution…

slide3

Where’s the front? (easy question)

What kind of front is on this map? (tougher question)

How can you tell from the data what kind of front itis?(really tough question – or maybe not so tough)

slide5

This map has every major kind of front analyzed somewhere on it.

What are the frontal types and their symbols?

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Example of a very powerful front. What makes it strong? (Use the data and the definition : a “transition zone between two air masses of different density”)

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Typical symbols on a weather map. Note the cross section goes through the cold front.

Viewed along the cross section, these are typical clouds and precip types.

At a station, this is the sequence you’d expect with this cold frontal passage (front moving east to west)

slide10

Similar to the cold front, this is a typical weather map for a warm front.

Warm front cross sections have stratoform clouds and steady precip.

Here’s a typical weather sequence if the front is moving from south to north.

(Show time lapse FromClrtoLowovcst

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It works!

Proof!

slide17

Here’s the temperature trace.

At what time did that cold front reach Oneonta?

slide18

Same time, of course

Dewpoint trace

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Before you see the pressure trace, what do you expect to see, given what you know now about fronts?

Rapid pressure rise after front passes

Pressure falls before front arrives

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At 06Z, frontal passage is occurring in central NY with showers (on radar) but temperatures haven’t fallen yet.

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Here’s a small part of the 18Z surface map from Sept 11, 2014. Consider Albany to be in the light air and Oneonta to be just across the front in the dense air.

Here is Margules’ formula:

Assume the mean latitude is 42.5 N and g = 9.8 m/s. Use the wind shown at Oneonta (4 kts) as an estimate of the Geostrophic wind normal to the front. Estimate anything else you need from the observations. Calculate the angle this front made with the ground. What could one do with that number?