Wish I kept records back then…anyway, we had a snowfall in the morning up here, I want to says something like 6”-8” in bitter cold temps before the warm front blasted through changing it over to plain rain. Then that evening the arctic front barreled through changing the rain over to snow and everything froze. At the time NYS was trying to save money and NYSDOT had cutback on night and holiday plowing. As a result the roads became blocks of ice that were impassable for days rock salt was pretty much ineffective during the cold snap that followed. NYSDOT then developed a policy that the plow should be dropped if there is any snow between the white lines on the road. This link talks about the dramatic temp swings that occurred in NYC https://thestarryeye.typepad.com/weather/2012/02/new-york-weather-highlights-1994.html