A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

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The jet stream — a band of strong winds high above Earth’s surface — can shift and create opposing summertime climate conditions in northwest and southeast Europe. Tree-ring data reveal that the jet ...

The jet stream, or any wind, is the result of differences in surface temperature. In simple terms, warm air rises, creating low pressure, and cold air sinks, creating high pressure. Wind is the ...