On Fri, 14 Feb 2014 18:22:18 +0000
John Hall wrote:

In article ,
Martin Brown writes:
But how did the lore for the red sky in morning shepherds warning
get started - prevailing winds mean any cloud on the Eastern side
of us has already passed by and dumped whatever rain it was
going to.

I think the idea behind it is that when the sun rises the eastern
horizon is still clear, while cloud is already spreading in from the
west and has covered much of the sky, the sun thus illuminating its
under surface.

Similar argument applies in the adage that a rainbow is a good sign in
the afternoon but a bad one if seen in the morning.

--
Graham P Davis, Bracknell, Berks. Mail: 'newsman' not 'newsboy'.
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