1. Long-range forecast verification
Several organizations/groups involved at the WMO level:

2. Long-range forecast verification
And coordination working groups at the WMO level:

3. Long-range forecast verification
Several organizations/groups involved:
Joint Working Group on Forecast Verification Research of the WWRP and WGNE:

4. Long-range forecast verification
Several organizations/groups involved JGWFVR:
Joint Working Group on Forecast Verification Research of the WWRP and WGNE:

5. Long-range forecast verification
Tools:
R verification: