I said that the models showed that the *anticyclone* would retrogress, which is exactly what has happened.

No, it hasn't.

Yes it has. The anticyclone, which moved as far East as to be centred to our east,
then moved SW and is now centred in the mid Atlantic, south of the
Azores.
Erm that's not what happened.

The high pressure, which was centred to our east before the weekend

No it wasn't - it was directly over us.

Yes it was. Look back over the charts and you'll see that the most easterly
point of its progressive journey left its centre to our east. Look
back at the charts.
I did look back over the charts - but only to double-check before I made my
assertions, as I follow them in real time too.

pulled back through the weekend and early this week

No it didn't. The original high decayed from the north, allowing a

westerly flow to sink south over the UK. A new anticyclone moving from

west to east was in mid atlantic at the start of the week.


Pressure fell from the North, giving the appearance of a "decay"
(not sure exactly what you mean by that, word, Freddie) as the
high pulled back SW. After a brief incursion. the high
re-built and then clearly regressed SW again.
That's exactly how highs decay - by pressure falling.

to sit where it currently is in the mid Atlantic

There isn't currently a high in mid Atlantic. There is a broad trough.

apologies from me. There is at our latitude. I was not specific
enough. Look to the south of the trough in mid-Atlantic. What
do you see?
That high is pretty much always there - it has been for the period
of the changes since you issued your forecast.

allowing the incursion of cooler, Atlantic air

This occurred when the westerly flow was sinking south over the UK at

the weekend.

We've had 20C in London on Monday and a 15C max every day in
some part of the UK. That is clearly not an incursion of
cold Atlantic air. I don't think we've had any hill snow
in that time - but we will have tomorrow and perhaps later
today.
I didn't say cooler - just a westerly flow, to differentiate our weather
from that of high pressure.

and the change to a more progressive pattern, from a blocked pattern;

This occurred when the original block was eroded from the north by

strong cross-Atlantic westerlies - last weekend.

Yes. That's why I said that this retrogression began
"at the weekend", but, by today, it hasn't led
to the incursion of cold Atlantic air that the
charts suggested would have happened, 10 days
ago. Although pressure has fallen, winds are
between south-west and west, rather veering more
NW, as the charts suggested would have happened
by today.
But it wasn't a retrogression. It was a replacement
of high pressure with a westerly flow by a
non-retrogressive method.

I'm open to learning here
Good.

--
Freddie
Castle Pulverbatch
Shropshire
221m AMSL
http://www.hosiene.co.uk/weather/
http://twitter.com/PulverbatchWx for hourly reports