"RST Engineering" writes:

But AGAIN, how do you read these charts. You say the grey bands indicate
wind speed. How? They all look the same grey to me. How do you
differentiate between the jet stream wind velocities?

It is pretty hard to see the gradient. I streteched and it is a bit clearer in
this version:

http://www.longhands.org/jetstream_pac_init_00.gif

Dan.