On Wed, 26 Dec 2012 12:22:18 -0000, "Alastair McDonald"
wrote:
Yes, but the net the zonal flow must always be zero otherwise all
the air
would gather at one longitude.
That's not strictly true, as you are not taking into account vertical
motion.

I don't think a stratwarm
centred on Moscow would bring us snow.
In my earlier reply, I was actually going to add that there are
probably _bad_ places for it to occur - but when I wrote the sentence
it looked a bit patronising, so I deleted it. I agree with what you
are saying up to a point, but as I said before I think you are over
simplifying the dynamics.

--
Freddie
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Shropshire
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