Why is "2013–14 North American winter" trending?

Wikipedia Overview

The 2013–14 North American winter was extremely active, deadly, record-breaking and bitterly cold for the United States and North America as a whole, due in part to the collapse of the polar vortex in November 2013, which allowed very cold air to travel down into the United States, leading to an extended period of very cold temperatures. The pattern continued mostly uninterrupted throughout the winter and numerous significant winter storms affected the Eastern United States. The Weather Prediction Center (WPC) tracked a total of 27 significant winter storms from November to May, underlining the hyperactivity during the winter months. Several of these events included a massive storm complex that affected most of the country and Canada before Christmas, two separate blizzards that affected the Northeast during the month of January with up to 1 foot of snow, and a rare Gulf Coast winter storm. The most notable of these events ended up being a powerful winter storm and nor’easter that dumped ice and snow in the Southeastern United States and the Northeastern United States in mid-February. Most of the cold weather abated by the end of March, though a few winter storms did affect the Western United States towards the end of the winter.