The northern branch of the jet features a trough over Alaska and the polar vortex extending across northern Canada into Greenland. The center of the vortex is over north-central Canada. This is a mild/cool pattern for western Canada, cool/cold over central Canada and mild/warm over eastern Canada. The southern branch of the jet features a ridge in the eastern pacific extending into the western US. A trough over the Plains and western Midwest. A strong blocking ridge over the eastern US. And a trough in the western atlantic.Subtropical high pressure is located off the southwest coast of Mexico.