In Upstate NY, 60 miles east of Niagara Falls, the cold snap didn't amount to much. Coldest part of the winter so far, upper teens, low 20s for the highs, single digit lows, but this has been one of the warmest, least wintery winters I can remember. Little to no snow/snow cover until a week and a half ago. Jet stream is pushed way south in the midwest along the east side of the Rockies and returns North about halfway between Rochester and Buffalo. Jet Stream doesn't CAUSE the weather, but allows/pushes the cold air masses south.