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This was posted today to another list I subscribe to. I thought there
might
be some interest here, too.
Bev in AZ
>FREAK: RARE CLOUD -- WITH POSSIBLE WARNING -- SEEN OVER COLORADO
>
>High-flying clouds of ice crystals were spotted in the sky over Colorado
>Tuesday night, the first time they've been seen this close to the
equator.
>
>The cloud clusters are common closer to both poles of the Earth during
the
>summer. They had never been spotted in the U.S. south of North Dakota.
>
>"This could be a signal that something is happening to our upper
atmosphere,"
>Gary Thomas, a professor at the University of Colorado's Laboratory for
>Atmospheric and Space Physics, tells Firday's DENVER ROCKY MOUNTAIN NEWS.
>
>The NEWS' Charlie Brennan reports that Tuesday's sighting was recorded by
>three men in three locations: CU meteorology instructor Richard Keen near
>Boulder, Utah State University physics professor Mike Taylor in Logan,
Utah,
>and Mark Zeilcik, a noctilucent cloud researcher in Edmonton, Canada.
>
>There are diverse theories as to what caused the clouds to form at such a
>southerly latitude.
>
>"It could be an indication that we're polluting our atmosphere with
>greenhouse gases, or it could be part of a natural cycle of long- term
>trends," said Thomas.
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