What do these Wx charts really mean/signify ?

[Puritan]

Sorry to appear thick but could somebody please explain some of the folowing:

What does the 'divergence' indicate ?: http://grads.iges.org/pix/euro5.72hr.gif

What do these charts indicate ? : http://grads.iges.org/pix/euro1.48hr.gif

and

http://grads.iges.org/pix/euro4.24hr.gif

I've a fair idea on some/most of them, but I'd really like to know a lot more about these - laymans terms please.

Ah well, thanks in advance folks..........

Nb. the Home page for the all the above is at: http://grads.iges.org/pix/euro.fcst.html