Friday, May 27, 2016

NOAA: `Near Normal' Atlantic Hurricane Season Expected


With the caveat that it just takes one major land falling storm in a populated region to make for an epic hurricane season, today NOAA announced their prediction for this year’s Atlantic hurricane season.  

First their statement, after which I’ll have a bit more.

70 percent likelihood of 10 to 16 named storms

May 27, 2016 NOAA’s Climate Prediction Center says the 2016 Atlantic hurricane season, which runs from June 1 through November 30, will most likely be near-normal, but forecast uncertainty in the climate signals that influence the formation of Atlantic storms make predicting this season particularly difficult. 
NOAA predicts a 70 percent likelihood of 10 to 16 named storms (winds of 39 mph or higher), of which 4 to 8 could become hurricanes (winds of 74 mph or higher), including 1 to 4 major hurricanes (Category 3, 4 or 5; winds of 111 mph or higher). While a near-normal season is most likely with a 45 percent chance, there is also a 30 percent chance of an above-normal season and a 25 percent chance of a below-normal season. Included in today’s outlook is Hurricane Alex, a pre-season storm that formed over the far eastern Atlantic in January. 

“This is a more challenging hurricane season outlook than most because it’s difficult to determine whether there will be reinforcing or competing climate influences on tropical storm development,” said Gerry Bell, Ph.D., lead seasonal hurricane forecaster with NOAA’s Climate Prediction Center. "However, a near-normal prediction for this season suggests we could see more hurricane activity than we’ve seen in the last three years, which were below normal.”

Bell explained there is uncertainty about whether the high activity era of Atlantic hurricanes, which began in 1995, has ended. This high-activity era has been associated with an ocean temperature pattern called the warm phase of the Atlantic Multi-Decadal Oscillation or AMO, marked by warmer Atlantic Ocean temperatures and a stronger West African monsoon. 

However, during the last three years weaker hurricane seasons have been accompanied by a shift toward the cool AMO phase, marked by cooler Atlantic Ocean temperatures and a weaker West African monsoon. If this shift proves to be more than short-lived, it could usher in a low-activity era for Atlantic hurricanes, and this period may already have begun. High- and low-activity eras typically last 25 to 40 years.

In addition, El Niño is dissipating and NOAA’s Climate Prediction Center is forecasting a 70 percent chance that La Niña — which favors more hurricane activity — will be present during the peak months of hurricane season, August through October. However, current model predictions show uncertainty as to how strong La Niña and its impacts will be.

(Continue . . .)

While these outlooks can give us an idea of what kind of season to expect, long-range forecasting is still fairly crude, and the number of storms matters less than where the storms that do form end up going.

Below average hurricane years - such as we've seen for the past three seasons - are always welcome, but they don't necessarily turn out uneventful.

The outlook in 1992 was for a `below average' year, and with only 4 hurricanes and 3 tropical storms, it certainly met that mark. 

And were it not for the first hurricane of that year - a CAT 5 monster named Andrew that devastated a large swath of South Florida - there would be little reason to remember it.

Andrew was the last land falling CAT 5 storm to hit the US mainland. Before that, you'd have to go back to Camille, which struck the Gulf coast in 1969.

It's been more than 10 years since the last major (CAT 3+) storm has hit the United States (Wilma in 2005), and hopefully we'll avoid that again this year.

But the smart money is on preparing as if we won't get that lucky. 

Last Sunday, in Hurricane Preparedness 2016,we looked at many of the steps you and your family need to do to prepare for this year's hurricane season.

And lastly, when  it comes to getting the latest information on hurricanes, your first stop should always be the National Hurricane Center in Miami, Florida. Those on Twitter should also follow @FEMA, @ReadyGov. @CraigatFEMA, and @NHC_Atlantic  or  @NHC_Pacific.

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