It all depends how you look at it, and what you mean by warm and cold in
this context. All surface high pressure areas are the surface manifestation
of a cold anomaly in the atmosphere above. In most cases this is at the top
of the troposphere and in the lower stratosphere, but over a cold
continental surface the lower troposphere can become cold enough to produce
a surface high, even if there is relatively low pressure aloft.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.btinternet.com/~wokingham.weather/wwp.html
"Simon S" wrote in message
m...
I don't remember ever seeing it but can a warm high such as the azores
high become and cold high if it is displaced for long enough? If it
happened would it get stronger or weaken in the same way a low does
when cold air goes all the way round. Some modells seem to be
suggesting that the Atlantic High (Displaced Azorse high) will move
north and combine with the Russian high as it moves west. Would mean
that the high would become a cold high?