On October 28, 1991, a extratropical cyclone that developed along a cold front that had moved off the north east coast of the U.S. Part of it started over the Great Lakes as a typical mild low-pressure system moving from Chicago to New England. Meanwhile, a cold high-pressure system emerged in Canada and moved south. The low pressure very quickly deepened and became an important highlight in the western Atlantic. When these two systems came together in the North Atlantic they formed a very strong Nor'easter over the ocean. At the same time Hurricane Grace, which had formed on October 27 from a pre-existing subtropical storm and was initially moving northwestward, made a sudden turn to the east. It continued to go northeastward up the coast toward New England, but even though it was weakening, it finally swirled directly into the path of the existing storm, creating a completely huge...