Ocean temperatures in the equatorial Pacific are showing signs that an old acquaintance is about to return.Sea surface temperatures have warmed across the Pacific’s midsection during the Spring, and more importantly, a large pulse of subsurface warmth has propagated from west to east.
El Niño conditions have a variety of impacts around the globe, although every event is different. Typically, upper-level westerly winds intensify, a circumstance that could suppress the development of some Atlantic hurricanes this summer. During winter, the North Pacific jetstream flattens its trajectory and moves farther south, which usually brings more warm winter storms across Southern California and Southeastern US. The Pacific Northwest often experiences warmer and drier winters.