On Dec 8, 12:03*pm, "Martin Rowley"
wrote:
"Martin Rowley" wrote ...

So, the analyst would look as these data - and want, say to
investigate why P16 was markedly colder than the rest, and view the
mslp (and perhaps other diagnostics) that are attached to that
particular outcome.

We don't (AFAIK) see these on the open 'web', so in a sense the
coloured 'P' lines/numbers aren't of high relevance.

We do - as well as the "postage stamps" Norman mentioned, you can see
each GFS ensemble member in detail at Meteociel.

http://www.meteociel.com/modeles/gefs_cartes.php

Click the numbers +1 to +20 where it says "Perturbations", or "Moy"
for the ensemble mean.