A new version of LuckGrib has been released, macOS v3.3 and iOS v1.4, and this version comes with much improved support for ensemble models.
Here is a pair of teaser images:
This new ensemble information is available in three models, two upgraded and one new.
A tutorial is available which describes the images above, along with many more details.
If you are interested in studying long range forecasts, such as sailors do during departure planning, you should check this out.