On Wed, 06 Mar 2013 21:23:29 +0000
Martin Rowley wrote:

But /why/ the differing analyses needs more work. If one centre has
got a better handle on the initial state that should really be fed
through to other workers; given that all analyses are based on a
previous model iteration (often run several times to provide a
nominal 'base'), then it's almost a self-fulfilling process; better
analysis - better forecast - better 'background' for next cycle -
better assimilation of new data - better forecast etc.

Used to be that the ECMWF model didn't run until nearly 12 hours after
data time, about 9 hours after Met Office, so it would obviously have
more data. Don't know whether that's changed.

--
Graham P Davis, Bracknell, Berks.
Carlos Seixas, Sonata nº 1: http://www.youtube.com/watch?v=YXox7vonfEg
And for something completely different, Cumberland Gap:
http://www.youtube.com/watch?v=AsU-LTwx8Co