A student needs to edit the draft of an essay on weather trends.

Extreme weather is not new to scientists. A polar vortex is a large-scale cyclone located near either of the earth's geographical poles, it is a strong area of low-pressure. Polar vortices are weaker during the summer and stronger in the winter. Counterclockwise winds around the vortex sometimes push waves of extremely cold air into the United States of America. Could last for a week or more. Staying out of the cold is recommended during extreme weather conditions, such as those created by a polar vortex.

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