Three of five identified summer weather regimes have significant frequency trends: declining cyclonic Northern European conditions (WR1), declining Atlantic-anticyclonic/southeastern-European-cyclonic conditions (WR2), and increasing Mediterranean/Central European anticyclonic conditions (WR3). Their occurrence changes are associated with regional dynamic hydroclimate trends.

Evidence (1)

European summer drying largely driven by atmospheric circulation changes since the 1980s — Partitioning post-1980 hydroclimate trends between circulation and thermodynamic forcing

The WRs show a clear imprint on the spatial patterns of hydroclimatic variables

https://doi.org/10.1038/s41561-026-02050-w#unit-3-p9

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