Multiannual changes in the mean annual number of days with (left) thunderstorms and (right) severe thunderstorms, computed as a difference between mean annual values in 1979–97 and 1998–2017, based on ERA-Interim. Hatched gray polygons denote areas where ERA-Interim (and/or the metrics used to derive TDs) has been shown to considerably overestimate TDs (Fig. 3), so results obtained within these areas should be interpreted with caution. The definitions of a thunderstorm and a severe thunderstorm
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