The northern branch of the jet stream features a weak blocking ridge over eastern Siberia. A weak trough over western Alaska. A weak blocking ridge over northwest Canada. And the polar vortex over central and eastern Canada. This is a mild pattern for western Canada, cool/cold over central and eastern Canada. The southern branch of the jet features a ridge in the eastern pacific. A migratory trough over the interior western U.S. A trough over northeast Mexico and south Texas. And a weak ridge over the southeast U.S. Subtropical high pressure is located over the western Caribbean.