BUFFALO, N.Y. – A dangerous lake-effect snowstorm paralyzed parts of Western and Northern New York on November 18. As much as six feet of snow had accumulated and the storm was blamed for the deaths of two people stricken while clearing snow. The storm’s severity varied widely due to the peculiarities of lake-effect storms, which are caused by frigid winds picking up moisture from the warmer lakes and dumping snow in narrow bands.