What impacts do El Nio and La Nia have on tornado activity across the country?
Since a strong jet stream is an important ingredient for severe weather, the position of the jet stream helps to determine the regions more likely to experience tornadoes. Contrasting El Nio and La Nia winters, the jet stream over the United States is considerably different. During El Nio the jet stream is oriented from west to east across the southern portion of the United States. Thus, this region becomes more susceptible to severe weather outbreaks. During La Nia the jet stream and severe weather is likely to be farther north.
