The northern branch of the jet stream features a blocking ridge extending from northeast Siberia eastward across Alaska into northwest Canada. And the polar vortex over northeast Canada and Greenland. This is a mild/cool weather pattern for Canada. The southern branch of the jet features a trough extending from the Gulf of Alaska southeastward to the west coast of the US. A trough over the northern Plains and Prairies. A weak trough over the Ohio River Valley. And a ridge along and off the east coast of the US. Subtropical high pressure is located over the western atlantic.