The The Old Farmers Almanac Reports

Another polar vortex has hit the United States!

This time you don’t have to worry about waking up to snow, but you might have to dig out your sweater!

Weathermen use this term to indicate a drop in temperature that is unusual for the time of year.

To see the cause and effects of the summer polar vortex, check out:http://www.almanac.com/blog/weather-blog/when-jet-streams-wiggle

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Photo Credit: NASA