18 Hrs
Source:
USA TODAY
Polar vortex increases winter uncertainty
A strong polar vortex and an intense El Niño are likely to influence this winter's weather in the United States. While the polar vortex initially appeared record strong, it has since weakened slightly, and forecasters believe a combination of these factors could result in a generally milder winter for many regions. However, disruptions to the vortex could still lead to periods of cold weather, and interactions between El Niño and the vortex remain uncertain. Climate change provides an overarching background that may modify typical winter patterns.
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