On Jan 25, 6:31�pm, Paul Hyett wrote:
On Fri, 25 Jan 2008 at 09:09:55, Will Hand
wrote in uk.sci.weather :

I noticed the air was surprisingly dry for a winter warm-sector airmass
- where did it originate?

It came from the polar regions. The polar maritime airmass that came
southwards across the UK on Thursday behind the cold front got well
south of 50 North, and so as the winds backed southwesterly during
Friday the polar origin air over Biscay and further to the southwest
began returning northeastwards across southern UK on the northern
flank of the anticyclone. Hence the still relatively low dew
points.There was no low level tropical origin air mass over southern
Britain on Friday.

Dick Lovett
Charlbury