| Start date | End date (short events) | Event type | Affected data | Description |
|---|---|---|---|---|
| 06/01/2021 | 08/01/2021 (~22UTC) | Data outage | ADS-C aircraft data | |
| 12/01/2021 | Data selection update | in-situ data | Monthly update of in-situ data selection | |
| 12/01/2021 | Land surface data selection update | Surface variables: T2M, RH2M and snow |