Scientists say the polar vortex is weakening weeks ahead of schedule. Meteorologists warn the unprecedented early disruption could increase the risk of cold spells across the Northern Hemisphere, while its impact on the coming winter remains uncertain; winter temperatures may be less severe as a result.
Reporting from 2 identified publishers across this event arc.
These publishers contributed reporting to the broader event history. Not every source addresses the specific development described above.
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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