Part 3/8:
The primary impact of a La Niña event in North America is the shift in jet stream trajectories. During La Niña winters, the jet stream tends to dip southward over the United States, bringing colder air and storm systems to certain regions while leaving others warmer or drier.
- Pacific Northwest and Northern States: These areas often experience cooler than normal conditions due to the jet stream's positioning. The cooler Pacific waters influence the flow of weather systems, resulting in chillier weather and increased chances of storms.