@idefix37 thanks for the explenation.

You may try it.
I started with the following choice of colours:
Green: the best conditions for sailing. Enjoy wind and sea.
Orange: conditions becoming tougher. Be careful
Red: hard conditions for a standard 30’ - 40’ cruising boat. Better to stay sheldered.
The result is may be not artistic but efficient.
I like to explain the Beaufort scale also with this table from F.Singleton, with a little humour :

0_1543477981973_88E42211-666E-4883-A140-133CED40A3E3.jpeg

https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/wea.153

@oliverevans96
On Windy.com (not in the phone App) you can modify the colormaps as you like.
Go to Settings -> Modify layer colors
https://community.windy.com/topic/6455/colors/2
The modification will be applied to your phone App.

Here is a lot of examples of modified colors
https://community.windy.com/topic/7036/version-2-windy-customized-graphics