If your talking about 3 days or longer why bother looking at just the *one*
operational run when *all* the other outputs\ information from that model is
available?
:-
http://217.160.75.104/pics/MT8_London_ens.png










"Dave.C" wrote in message
. uk...
People like to discuss the changes each new run of models bring but how
much
of this is pure conjecture? I saved the 18Z 500hpa chart from the 21st and
tonight's run is virtually identical. This indicates some good modelling
if
it stays the same right through the forthcoming "event" because in the
past
there have been some significant changes for impending "northerly
blasts"in
the same time frame.

Dave