Why is "2012–13 North American winter" trending?

Wikipedia Overview

The 2012–13 North American winter was a very active winter weather season by metric of the amount of storms rated on the Regional Snowfall Index (RSI), with 19 storms being rated on the scale. The season started out somewhat early, as the remnants of Hurricane Sandy brought heavy snow to the mountains of West Virginia in late October. Later, a strong nor'easter affected the weary Northeastern United States, hampering storm recovery efforts and dropping several inches of snow. The rest of the winter featured several other notable events, such as a Christmas winter storm that affected most of the Eastern United States, and the most notable event occurring in early February, when a powerful blizzard struck the Northeast and brought record snow to some areas. Overall, the majority of the continent, more specifically the central parts of the United States, experienced a persistently wintry and cold pattern that extended into the months of April and May, a theme that would be repeated the following winter on a larger and more widespread scale. During the winter, a weak El Nino was expected to influence weather conditions across the continent.