The northern branch of the jet stream features a blocking ridge over Alaska. A trough over northwest Canada. A blocking ridge over northeast Canada and a weak trough over Greenland. This is a warm pattern for western Canada, mild/cool central and east. The southern branch of the jet features a trough in the western Gulf of Alaska. A trough in the eastern pacific extending into the western U.S. A weak ridge over the Rockies and Plains and a trough in the eastern U.S. Subtropical high pressure is located over the northwest Gulf of Mexico and northwest Mexico.