The 2013-2014 polar vortex adds data points to the books – Climate Change: Vital Signs of the Planet
Analysis: Polar Vortex collapse causes heavy winter for North America and the Nordics - Kjeller Vindteknikk
When will the US feel the impact of the polar vortex? | kare11.com
Over 20 dead in US polar vortex, frostbite amputations feared
Weakened 'polar vortex' blamed for N. American chill
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What is a polar vortex and how to protect your home | HomeServe USA
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The polar vortex, briefly explained - Vox
Polar vortex could bring rare May snow to U.S. East | PBS NewsHour
Arctic Weather Plunges into North America
Weakening polar vortex may yield longer, harsher winters in North America
What Is A Polar Vortex? Your Freezing Cold Questions Answered : NPR
Polar Express: Arctic outbreak to invade parts of US
What's the polar vortex? – DW – 01/08/2014
When will the US feel the impact of the polar vortex? | kare11.com
US weather latest: USA death toll rises as polar vortex delivers snow and extreme cold | Weather | News | Express.co.uk
What is the 'polar vortex'?
US polar vortex: extreme cold weather heads to east coast – live | US news | The Guardian
What is the Polar Vortex?
In pictures: Polar vortex strikes North America - BBC News
Polar vortex' makes 187 million in US shiver
What Is the Polar Vortex? | NOAA SciJinks – All About Weather
Polar vortex 2022: What is it and how does it affect winter weather
