To close the gap between the “classical” representation of model data and your site I think a 2nd layer, which visualizes the numerical data as a contour plot, would be a general solution. With an independent z layer every user can combine 2 arbitrary model values (for example 850hpa temperature as colours and the sea level pressure as contour lines).

A second improvement would be the possibility to disable the color gradients. So it’s easier to detect cold fronts on the 850hpa temp map.

Thanks and keep on your great work!