@mparkay Yes, we know about it and we are thinking of completely new way of coloring the geopotential height. We will display difference of forecasted geopotential height and ISA geopotential height. It will allow us to have the same coloring in all levels. For example: purple color will stand for -30m ISA diff. So if there is low pressure system, it will have the same color in all levels. It should work well when moving the level slider, because you will be able to visually compare vertical changes of atmosphere.