...
06 UTC run on 22 Feb 2022
No action will be required by users, this This fix will go into operations and be available as part of the operational output from this run onward. Users should be aware that this fix also includes an upgrade of the GRIB 2 Master Tables Version from 27 to 28. This change will be transparent in terms of ecCodes usage but might affect those checking the tables version explicitly.
This fix to the model physics addresses these occasional spurious oscillatory low-level q/t structures (low RH and superadiabatic layer) in thick fog conditions in the lowest 150 m of the atmosphere, to ensure realistic well-mixed structures are retained whilst keeping the rest of the model atmosphere untouched. This was technically not a bug, but an occasional instability that was uncovered in Cycle 47r3.
...