On Thursday, March 20, 2014 2:24:46 PM UTC, Freddie wrote:
And where did I mention the pattern retrogressing?

My apologies. Badly worded. The pattern is not conducive to

anticyclones retrogressing is what I meant.

Accepted.

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.

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.


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.

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?

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.

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.

I'm open to learning here, if I am wrong, but that's certainly what I saw on the charts. Do look back, as I feel you have it wrong.


Freddie