Len
I think it's your eyes!
I would say the colour of the warm front is quite close to poppy red.
The free app ColorPic that I use says it R=254, G=50, B=0.
What bugs me is that they lay the fronts on top of the isobars, which means there is never any degree of troughing of the isobars when they meet cross a front or trough.
Bruce.