Weather topic...Lapse Rates Simplified.

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Weather topic...Lapse Rates Simplified.

Postby gracecab » Sat Feb 07, 2015 7:25 pm

http://youtu.be/RF8nnJoAlSQ

Pretty basic, but easy enough to get a picture of why we want unstable air, etc...
Chris Ballmer aka gracecab
Ventura, CA
UP Kantega XC2 / Gin Verso
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Re: comment

Postby sd » Wed Feb 11, 2015 10:17 am

A little slow and basic but well illustrated. Being basic, they left out some of the micro stuff, like heat puddles, and triggers that release like inverted snowballs rolling uphill, or inverted stalactites wicking off. Also, the wet adiabatic lapse rate varies quite a bit depending on temperature and altitude because it is dependent on the moisture mass. Cloud Suck is related to the latent heat releasing at cloudbase amplifying the temperature contrast and thus buoyancy. We usually fly in the middle zone between spontaneous instability and stable. We often refer to a poor lapse rate as inverted even when it's slightly positive. If it's actually inverted we aren't going up. If it's spontaneously unstable, it's usually raining.

I sometimes give the explanation that "heat" is the actual energy and "temperature" is a measure the energy density, so as we expand or contract a bubble the heat energy stays the same by the energy density changes. My analogy is technically not correct because temperature is actually the speed of the molecules, so you can have super high temperatures where the energy density is very low, but in the closed system we are looking at it the analogy is applicable.
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