Precip accumulations as part of UI

[kaedonkers]

Precip visualisation would likely need accumulation features as this is a common usecase
iris rolling window function would be a good function to implement for this

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[andrewgryan]

I think this is a much needed extension to the UI. I'm about to start building convenient features into the UI

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.