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Last Updated: Monday, 12/21

We’re down to less than a week until Santa loads up his sleigh and heads out to deliver presents around the world. But what can Jolly Old Saint Nicholas expect from Mother Nature when he arrives in the U.S.? Of course, Santa isn’t the only one who needs to worry about the weather. For all of you that have shopping, travel or other festive activities planned on Christmas Eve and Christmas Day, here’s your MORECAST outlook:
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We’re all familiar with rivers of water on Earth’s surface, but rivers of a different kind also exist in the sky. Atmospheric rivers are flows of airborne moisture that are thousands of miles long and hundreds of miles wide. Each of these moisture flows can transport more water at any given time than the entire Amazon river, the largest river on Earth.
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According to the heavens–more specifically, the Sun–astronomical winter is about to get underway in the Northern Hemisphere. Also known as the Winter Solstice, the new season will begin at 4:49 Universal Coordinated Time on December 22nd, which is Monday night, December 21st in North America, and Tuesday morning, December 22nd in Europe. That is when the sun will be at its southernmost point in relation to the equator. The first day of astronomical winter is also the shortest day of the year in terms of daylight in the Northern Hemisphere.

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People who live in such different locales as New Orleans, Louisiana, Chicago, Illinois, and Banda Aceh, Indonesia have at some point faced massive, deadly swells of water. In a crisis mode they may not have known or cared to know about the technical term or cause of their imminent destruction. However, the three superficially similar phenomena that devastated those communities originated from completely different causes with different implications for predictability.

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