Re: [APML] OT: Water Vapor Image

["Bobby Middleton" <bobm@koyote.com>]

----- Original Message -----
From: Thomas W. Earle
> Water vapor is indeed a good tool to distinguish how "clear" the sky is
> above you.  Another interesting fact to keep in mind:  Those dark areas
> (sometimes red depending on the color table) that indicate a clear sky are
> also a good indicator of turbulence.  As a result, you might have really
> clear skies but the turbulence above my hinder your seeing significantly.

Yes that is many times the case; usually due to the passage of a cool front
with dry artic air and a screaming northern jetstream. The exception here in
east Texas is in summer and fall when high pressure areas settle in. They
sometimes show very dark areas with no upper air moisture in the GEOS-8
image I watch here:
http://www.ssec.wisc.edu/data/g8/latest_g8wv.gif
The high pressure usually means a stagnant upper air circulation and perhaps
excellent seeing.
Bobby Middleton


http://www.koyote.com/users/bobm/word.htm



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