* Glaciers that covered the northern hemisphere?
* The Laurentide Ice Sheet was the largest, covering much of North America during the last glacial period.
* The Cordilleran Ice Sheet covered western North America.
* The Inuitian Ice Sheet covered northern Canada and Greenland.
* The Fennoscandian Ice Sheet covered much of northern Europe.
* The Barents-Kara Ice Sheet covered parts of northern Russia.
* Glaciers that specifically flowed south from a northern starting point?
* The Laurentide Ice Sheet flowed south, reaching as far as the Ohio River Valley.
* The Fennoscandian Ice Sheet flowed south into central Europe.
* Glaciers that currently exist in the northern hemisphere?
* There are many glaciers in the Arctic (e.g., Greenland, Iceland, Svalbard).
* There are also glaciers in the Rocky Mountains, the Alps, and other mountain ranges.
Please clarify your question so I can provide a more specific answer!
