Observed at 12:00, Friday 18 April BBC Weather in association with MeteoGroup, external All times are Alaska Daylight Time (America/Anchorage, GMT-8) unless otherwise stated.

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A sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation ...

As climate change melts ice sheets and glaciers, water is being redistributed across the globe — and could end up moving the ...