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In either case, the subsequent evolution of the forecast should be carefully monitored, or even treated with suspicion, as the instability in the structure of the IFS atmosphere transferrs downstream.  In some cases there can be jumpiness in the forecast conditions for several days later at locations well away from the initial differences.  For this reason it can help to inspect the analysis increment data before comitting committing to a forecast.

Large increments in many variables are also sometimes noted where observational data has become available in the vicinity of a vigorous pressure system (e.g. dropsondes in the vicinity of a hurricane).  These indicate there were shortcomings in the background forecast of the feature that the analysis system is trying to reduce.

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