GreenPat said...I think inverting the colour of the arrows might be appropriate across the board for that sort of graph.
Proposed new colour scheme (for those who love wind):
0-10: black - as in stay inside and sleep
10-20: amber - as in got to the pub and drink it
20-30: green - get there!
30-40: yellow - as in what will be in your wetsuit
40+: brown - see above ;-)
