Re: GPS/XM Weather Question

"Casey Wilson" <N2310D @ gmail.com> wrote in message
news:TSTBg.10080$l95.2392@xxxxxxxxxxx
Hmmmm, first, you are not going to see any clouds or water vapor with
the infrared -- they are transparent to the photon energy being emitted by
the stuff below.

You've written this twice, and I still don't believe it (with respect to
clouds). I see non-rain clouds in infrared satellite images all the time.
Right this moment, looking at the Northwest area radar images, I see a large
cell of light rain in the Yakima area, a smaller cell of light rain near
Hood River, and basically nothing else. Yet, on the infrared satellite
image, clouds obscure the entire middle third of the southern half of
Washington, the entire northwest corner of Oregon, with some spottier areas
in the northeast and southwest corners of Oregon. MUCH broader areas than
are shown on the radar.

This is just one example, but it is consistent with dozens of other
observations of the infrared satellite image (there'd probably be more, but
frankly I don't use that imagery very often anyway, so I don't bother to
look at it very much).

Note that ADDS presents an 11 micron wavelength infrared image, smack in the
range you claim won't show clouds. ADDS also specifically says that the 11
micron wavelength image shows clouds, just as the images there appear to do.

I'm curious if you have any reliable reference that supports the statement
that infrared in the 8-12 micron wavelength range will not show clouds. On
the face of it, the statement appears to be incorrect. I can believe that
*some* particularly thin clouds may not be visible in infrared images, but
it's clear to me that a general statement that clouds don't show up is
wrong. I see clouds on the infrared all the time.

Pete


.

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