News Finding: This prompts a commensurate anomaly east of the Philippine Islands, which, in turn, results in a strengthening or weakening of the jet stream in the Northern Hemisphere, having a direct influence on the amount of rain that falls on California between November and March.
Paper Finding: This mechanism allows for maintenance and propagation of the SST anomalies from the northwestern Pacific to the northcentral Pacific ( Supplementary Fig.
News Context: "Knowing how much rain to expect in the coming winter is crucial for the economy, water security and ecosystem management of the region." This prompts a commensurate anomaly east of the Philippine Islands, which, in turn, results in a strengthening or weakening of the jet stream in the Northern Hemisphere, having a direct influence on the amount of rain that falls on California between November and March. "With the New Zealand Index, we can predict from late summer the likelihood of above- or below-normal winter precipitation in the southwestern U.S., with a correlation in the order of 0.7 -- compared to the El Nino-Southern Oscillation technique, which has a correlation around 0.3 to 0.4," said lead author Antonios Mamalakis, a UCI graduate student in civil & environmental engineering.
Paper Context: The SST anomalies affect the atmospheric pressure in the US west coast and strengthen the regional jet stream which brings more winter storms in the SWUS; b Late-summer positive SST anomalies (red shading) in the NZI region deflect the jet stream to the north, leading to dry conditions over the SWUS As soon as the cascade to the northern hemisphere has occurred, SST anomalies in the northwestern Pacific persist through boreal winter (see Supplementary Fig. This mechanism allows for maintenance and propagation of the SST anomalies from the northwestern Pacific to the northcentral Pacific ( Supplementary Fig. 8 ).