The prototype of the Country Hydromet Diagnostics (CHD) was developed in 2020 as a priority action of the Alliance for Hydromet Development and under WMO leadership and with guidance from a multi-party Working Group. The 2022 update reflects lessons learned and feedback from the CHD road-testing with 16 countries that took place in 2021, further consultations with Working Group members, WMO Secretariat staff and members of the Alliance for Hydromet Development. Grateful thanks are extended to all of those involved in the original process and in the preparation of this update.