*** 20th Anniversary: 2003 to 2023 ***
More about meteorology.
The wind blows. It might carry a cloud of dust or smoke across the sky.
Similarly it can can transport a pool of warm or
humid air, or that defined by some other attribute. That's advection.
We forecast future weather over the short term by talking about advection of
gradients. A gradient is an abrupt of change in temperature or other property over a short distance. These boundaries exist near the edges of the warm or humid air masses and fronts, for instance.
What happens when such a front passes over? As Bob Dylan once said…
The Times They are a-Changin'
…at least they are when a gradient
moves across your region.
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Get with the changing times? Here's how I did it….
I still had to work at it, but it didn't seem like work.
http://buildit.sitesell.com/SBI-tv.html
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It's easier to tell when we don't.
Here is an example of upper winds advecting fronts.
Look at a map used to forecast weather. The pressure, the upper wind field would appear as a set of roughly concentric curves or swirls centered about some point.
At the same time the temperature field, if that is what we are examining, would be represented by a separate set of isopleths, called isotherms. They would surround a nearby spot.
Imagine the temperature gradient mentioned above as an arrow cutting straight across the isotherms and pointing
downstream. Naturally, you would expect the two sets of contours to cross each other at several points in this case.
As a science project idea to help you visualize this, sketch two bulls eye patterns near each other on a piece of scrap paper. Maybe similar to this design below. Where the lines cross, they should form several small-area parallelograms, little four-sided boxes.
#23
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