The northern branch of the jet stream features a blocking ridge over Alaska and western Canada. The polar vortex over central and eastern Canada. And a blocking ridge over Iceland and eastern Greenland. This is a cool/cold pattern for most of Canada. The southern branch of the jet features a trough in the eastern pacific/Gulf of Alaska. A weak ridge over the western U.S. A migratory trough over the Rockies and Plains. A ridge over the interior eastern U.S. And a trough in the western atlantic. Subtropical high pressure is located over Central America and the Caribbean.