In article ,
Dave.C writes:
Probably a silly question but do all of the major models (ECM, GFS,UKMO etc)
obtain independent raw data to produce their model output or is there
some/lots of overlap and it's the programming that causes the differences?

It must be the programming, surely? I can't believe that all the data
isn't available to all the models?
--
John Hall
"Honest criticism is hard to take,
particularly from a relative, a friend,
an acquaintance, or a stranger." Franklin P Jones