This diagram shows daily probabilities for four types of Euro-Atlantic weather regimes over ...

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**Note:** In **June 2023** ECMWF implemented a **major upgrade ...**

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The air flow is not the same at all levels and can be very different in strength and direction when associated with vigorous weather systems...

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Uncoloured areas (relative humidity < 65%) are likely to be free of cloud. Coloured areas (relative humidity > 65%) show where moisture is likely to be available for cloud development...

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