A scheduled essential maintenance of the Cloud infrastructure is planned on Monday 22nd September 2025, from 11 UTC for a maximum time of 2 hours (time window subject to change).
During this period, access to the following services will be disrupted significantly:
- Atmosphere Data Store (ADS), Climate Data Store (CDS) and CEMS Early Warning Data Store (EWDS)
- CAMS and C3S websites
- ECMWF Forum
We advise users to monitor our ECMWF Service Status page to check the Data Stores status and other ECMWF services.
Access to the affected services will be restored as soon as the maintenance session will have successfully completed.
Should the timing of the session be changed, we will post an update in this tred.
We apologise for the inconvenience this may cause.
ECMWF Support