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When you try to register a user account on you get this message:


This is a common issue for users based in China.

This is because the ECMWF registration page contains a Captcha served by Google, which is blocked by most ISPs in China, so you see the registration page, but not the Captcha.

When you click 'Register', our system complains that the Captcha is not filled in.



  1. Connect through a VPN service for the purpose of registration. Then you will see the Captcha and can complete the registration.
  2. If you can not go through a VPN, contact us, confirming that you agree to the ECMWF Terms and Conditions, and we can create an account on your behalf.