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The EAWR system is characterized by two poles with either negative or positive surface pressure anomaly centers located over the northwestern Europe and the Caspian region. The positive winter EAWR pattern involves decreasing surface pressures from west to east with a low pressure anomaly center over the Caspian Sea region and a high pressure anomaly center over the northwestern Europe.The Black Sea-Eastern Mediterranean system is then affected by arctic air masses providing colder and drier than normal conditions, similar to those observed in the positive NAO years. The alternative EAWR winter pattern involves a positive surface pressure anomaly center over the Caspian region and a negative anomaly center in the northwestern Europe. The Black Sea is then accompanied by warmer and wetter than normal conditions as in the case of the negative NAO index