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There are (and probably always will be) some problems with NWP modelling including the IFS.   IFS output is constantly monitored for bias or inconsistency between forecast and observed values.  A list of inconsistencies is maintained and dynamically updated with a view to rectification of the problems.  Keep up-to-date with known IFS forecasting issues.  Note, those issues that have been marked as resolved (indicated by grey text in the link) will still be relevant when inspecting historical data.

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