fyi 45 degrees latitude forms the US/Canadian border for Vermont and Canada. So it'd be like having large icebergs floating by Maine. Probably won't happen so long as the Gulf Stream is flowing.
49 degrees is the US/Canada border beginning in Minnesota and going west.
Interestingly enough, the Titanic's coordinates are about the same latitude as I am and we all know it was sunk by an iceberg. This is probably due to currents (the Labrador one?). Of course, probably no where near the size of the ones you show either and that's the truly amazing thing for me. I tried adding the Google Earth KMZ but the forum doesn't like it. See attached for a JPG picture.