Spring rolled on freezing

On May Day in Central Europe established an unusually cold weather. In Warsaw and Prague daily maximum is less than + 5 °, and at night and does marked freezing. In the central provinces of Poland temperature drops to -7 °. Second night of freezing observed in the Kaliningrad region. Nightly lows are close to record levels. This is the first frost after 2007. A significant anomaly is due to a combination of two factors: a deep Zatoka air from Greenland and lowering tropospheric cold

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