On Sat, 22 Mar 2014 12:03:14 +0000, Graham P Davis
wrote:
Haven't looked at this set-up but that statement of yours describes
how
highs often retrogress. The high itself does not move west but
instead
gets eroded and replaced by one further west. That one progresses
east,
though not as far as the previous one, and gets eroded in turn and
replaced by another still further to the west. Although the
individual
highs all move eastwards, the average position of the main high
pressure area moves west.

Yes I know it's a bit of an optical illusion, the movement westwards
- but that didn't happen in this case. The old high was eroded from
the north, and a new one formed a long way (i.e. thousands of miles)
west. The upper pattern certainly wasn't one you would associate with
retrogression.

--
Freddie
Castle Pulverbatch
Shropshire
221m AMSL
http://www.hosiene.co.uk/weather/
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