el nino 2015-2016

[ljgeoff]

From Dr. Jeff Masters wonderful weather blog:

What can we expect this summer?
Because it's quite rare to have intensifying El Niño conditions at this time of year, it's difficult to glean a confident signal from past events on how El Niño might affect U.S. summer weather. The global effects of El Niño arise from a shifting of showers and thunderstorms into the central and eastern tropical Pacific, which causes a reverberating sequence of atmospheric waves that tend to enhance precipitation in some areas and reduce it in others. In midlatitudes, these relationships, called teleconnections, are usually strongest in the winter hemisphere; for example, Australia often falls into drought when El Niño is developing in Jun-Jul-Aug (see Figure 6). If a strong El Niño does develop and persists into northern winter, the likely U.S. impacts would be more clear-cut, including wetter-than-average conditions across the southern half of the country, from California through Texas to Florida. This month could be seen as a sneak preview of sorts, with soggy conditions prevalent across the central and southern Plains and two unusually-wet-for-May systems reaching southern California, one last weekend and another now on its way. There is some hope for drought relief in the Golden State, given that the odds of an wetter-than-normal California rise sharply for the strongest El Niño events, but by no means would a wet winter be guaranteed. The strong El Niño of 1987-88 (which happened to be the second year of a two-year event) produced a drier-than-average winter from California to Washington.

Given that El Niño tends to suppress hurricane formation in the North Atlantic, the odds of a quiet season in that basin are growing by the month. However, a season with few storms doesn't necessarily translate into a low-impact year: the anemic 1992 season included the catastrophic Hurricane Andrew. And it's possible (though unlikely) to have a busy Atlantic hurricane season even during El Niño. Right in the middle of the weak-to-moderate two-year El Niño event of 1968-70, the Atlantic produced its most active season in 36 years, with a total of 18 named storms, 12 hurricanes, and 5 major hurricanes--including the horrific Hurricane Camille.

So, the feeling I get is "expect the unexpected." For me in Michigan, I'm seeing very mild, warm spring weather. The garden is doing great.