Originally Posted by snaps
If im not asking a stupid question, what do the different colours mean in that 1st chart?
I'm still trying to figure out the general themes of the charts, but usually there's a legend of some description on the charts. In this one, the title at the top of the chart is "Wind speed/direction" at 850hpa (not sure myself yet what this bit means) and the side has the colour coding.
I've seen a good few references to 850hpa in the threads here over the last while. It sounds like it's a pressure, but is it related to altitude or anything?