On Dec 13, 9:52 am, Dick Lovett wrote:
On Dec 13, 8:59�am, Paul Hyett wrote:

I can understand why low pressure cells are deeper in winter - greater
temperature contrast, but what mechanism causes winter high pressure
cells to have higher central values than summer ones?
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

Its partly a case of what goes up must come down. The large amount of
rising air needed for a deep low descends somewhere to form an intense
high. Also the intense radiational cooling over the continents in
winter adds to the effect through the extra density of the cold
boundary layer air.

Sort of knock the theory about low pressure raising so many inches of
North Sea into a cocked hat doesn't it?

All it's got to do is cool down to affect all that hot air. So why
doesn't it strap all that high pressure instead of raising a tide?

Does it even suck in the right direction?