This week, 225 years ago, marked the start of "The Long Winter." Snow and bitter cold began on Christmas in the Chesapeake region. Thomas Jefferson recorded morning lows of zero in Annapolis for four days, followed by mornings too cold to register on his thermometer. Baltimore harbor froze Jan. 2 and did not reopen until an ice cutter arrived March 25. The bay froze, too, and many ships were lost.