Originally Posted by
Jim59
When a Regional QNH (UK) is given how is that determined and obtained by approach controllers?
Hopefully, never, since approaches are not based on what is a rough and ready forecast (UK IAIP defines a Regional Pressure Setting as for use only when an appropriate airfield QNH is not available).
In practice the Met Office disseminate Regional Pressure Settings as their forecast for the current hour and the next hour - originally via Afpex, most of us see them nowadays on the Met Office Aviation Met site.