On Jan 22, 6:36*pm, "Eskimo Will" wrote:
"Adam Lea" wrote in message

...

On 22/01/12 18:11, Stan wrote:
*indestrcible
azores high now trying to consume the uk.

Is this an example of a Bartlett high situation?

Absolutely not. A Bartlett high is a high that forms and then reforms under
a zonal WSW'ly flow with a jet stretching from *Newfoundland all the way
into Scandinavia. The meanders of this jet forms ridges behind travelling
depressions which then settle over near Switzerland. They are trhen
reinforced ad-infinitum by the pattern.

The high developping from the Azores you are seeing on the charts is an area
of rising pressure behind the disrupting upper trough. Many model runs link
this area of rising pressure with the Russian high which is now the more
permanent feature. It is the trough disruption process that is causing the
uncertainty at the end of next week, e.g. how fast, UKMO is relatively slow,
GFS is fast with the disruption hence the charts appear different but all
show rising pressure over the UK with a cold slab of air entrained. Will
upstream processes in teh Atlantic cause the Scandinavian block by then to
push west, that is where the 50-50 scenario comes from. All complex and
difficult to explain in words.

Will
--http://www.lyneside.demon.co.uk/Haytor/automatic/Current_Vantage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
---------------------------------------------

Funny you should mention Switzerland. Will be there for a week
starting next weekend. Base height of 1800m, skiing up to 3500m, so
also watching this evolve with interest, albeit from a slightly
different angle. I never thought I would say this, but I hope it won't
be too cold!