美国寒潮从华盛顿到波士顿？

今年美国寒潮很多，不经意看到下面的信息：
Across the southeastern U.S. Wednesday, hundreds of thousands lost power in their homes and businesses as a winter storm clobbered the region and prepared to head north along the eastern seaboard to drop inches of snow from Washington to Boston.

地址如下：

好奇怪喔，寒潮不是从北边 加拿大 那边来的吗，怎么是向北走啦，从 华盛顿到波士顿，奇怪了。

求大神解答。。