What does grey mean displayed on CLOUD BASE map (there is no height displayed)

[peterevans]

Hello,
I am looking at the CLOUD BASE map and see areas coloured according to the key. But there are large areas that are GREY and show no height when moused over (see image below)

What does GREY mean in this situation?

Thanks for your brilliant service.
Peter Evans (hang gliding and paramotoring)

[Rivermedic]

Did you ever get a answer to your question?
I’d like to know as well

[idefix37]

@Rivermedic
Where there is NO CLOUD, there is NO CLOUD BASE = grey ! It’s that simple.