As a follow up event of the system upkeep on last 19th May 2026, there is another planned maintenance session on the Data Stores underlying infrastructure on Monday 15th June 2026, from 11:30 to 14:30 UTC which may potentially be disruptive to some users e.g. impact on request queues, running of applications, API downloads etc. Access to MARS-stored datasets (e.g ERA5, CERRA, Seasonal Forecast data, EFAS, CAMS global forecast, S2S, TIGGE etc) is expected to be disrupted.
Should users encounter difficulties, we recommend in the first instance to please check the ECMWF Service Status page for the latest information available with respect to ongoing system sessions.
To avoid disappointment, we recommend users to refrain from submitting requests as long as “Data Stores” is not showing in green (all clear) status on the ECMWF Status page.
We thank our users for their patience.
ECMWF Support