What is the flow of weather in the US and Canada called?
If you mean what was the hurricane called
Then i know
It was called HURRICANE SANDY
Since this question is posted in "Movies", I am guessing that you are asking about the Continental Divide or so-called Great Divide which more or less follows the Rocky Mountains through Canada and the US, and continues down through Mexico. It divides the river systems that flow toward the Pacific Ocean from those that flow toward the Atlantic Ocean (or, in the north, those that flow into the Arctic Ocean).
There are several nations with a National Weather Office, including New Zealand, the UK and Canada. While each country's weather office has slightly different roles, their basic function is analogous to the US National Weather Service. They issue national weather forecasts, keep records of weather and climate data, alert the public to potentially hazardous weather conditions and provide education on weather phenomena.