Blending weights calculation overwrites weights of other ensemble members

[RubenImhoff]

In the current blending weights implementation, the weights of other ensemble members can be overwritten, nor are weights calculated for each member individually. To fix this, it requires the worker states to explicitly account for the weights per member.

[ladc]

Hi both, I'm working on something related #552. So maybe best to check this out before we work on the same in parallel :)

[RubenImhoff]

Hi @ladc, that is great! We can make it part of #552 . Will changes also work if we don't calculate in parallel? In other words, are we storing the states per member anyway? Then that would fix this issue, too. :)

[ladc]

Hi @RubenImhoff, I just realised that my "solution" doesn't work anyway if you have multiple STEPS members blended with the same NWP member. I will propose a less brittle solution. In any case, I would recommend storing the different model weights in different directories. Do you agree?

[RubenImhoff]

Yes, that works for me! :) Let me know if you need any help / review from us.