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I believe he is referring to radiational cooling. For instance, if you pour salt on a table and stand directly over it and blow on it, its going to spread out into a circle. Picture the air over the southeast as the salt, and the atmosphere as the table, when the heated air hits the atmosphere, it spreads out, thus adding shear to 99L. Since the heated air has nowhere to go once it escapes the lower levels, it has go be distributed evenly. Hope that helped |