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#496309 - 10/01/14 12:32 PM Quietest Atlantic Hurricane Season Since 1986
Marty Online   happy

Jeff Masters

The traditional busiest month of the Atlantic hurricane season, September, is now over, and we are on the home stretch. Just three weeks remain of the peak danger portion of the season. September 2014 ended up with just two named storms forming--Dolly and Edouard. Since the active hurricane period we are in began in 1995, only one season has seen fewer named storms form in September--1997, with Category 3 Hurricane Erika being the only September storm. Between 1995 - 2014, an average of 4.3 named storms formed in September. With only five named storms so far in 2014, this is the quietest Atlantic hurricane season since 1986, when we also had just five named storms by the beginning of October. In terms of Accumulated Cyclone Energy (ACE), activity in the Atlantic up until October 1 has been only about 43% of the 1981 - 2010 average.

Figure 1. Tracks of Atlantic named storms in 2014. Note how all of this year's hurricanes (tracks in red) have occurred well north of the tropics, north of 24N latitude--a testament to how hostile for development conditions have been in the tropics, due to dry, sinking air. Image credit: National Hurricane Center.

Forecast for the remainder of hurricane season
Looking at climatology, since 1995, we have seen an average of 3.6 named storms form in the Atlantic after October 1. Two of those years--2006 and 2002--saw no storms form after October 1. The most post-October 1 storms was eleven, which occurred in 2005--no surprise there! The latest 2-week forecast from the GFS and European models show a continuation of the basic atmospheric pattern we've seen over the tropical Atlantic this season, with plenty of dry, sinking air. These conditions should lead to lower than average activity into mid-October, which is when historically, Atlantic hurricane activity begins to drop sharply. I expect we'll see at least one more named storm in the Atlantic this year, with two a more likely number. It's unlikely we'll get three or more post-October 1 named storms.

During October, the focus of Atlantic tropical cyclone genesis shifts to the Western Caribbean, Gulf of Mexico, and the waters between the Bahamas and Bermuda. The Lesser Antilles typically see very few tropical cyclones after October 1, and I expect their hurricane season is over. Sea Surface Temperatures over the Caribbean are currently 0.2C above average, and 0.4C above average in the Gulf of Mexico.

Figure 2. Atlantic hurricane activity begins to fall off sharply around mid-October.

Figure 3. Vertical instability over the Caribbean in 2014. The instability is plotted in C, as a difference in temperature from near the surface to the upper atmosphere. Thunderstorms grow much more readily when vertical instability is high. Normal instability is the black line, and this year's instability levels are in blue. The atmosphere has been dominated by high pressure and dry, sinking air since June, which has made it difficult for tropical storms to develop, and no tropical depressions or tropical storms have been able to form in the Caribbean this year. Image credit: NOAA/CIRA.

#496310 - 10/01/14 12:47 PM Re: Quietest Atlantic Hurricane Season Since 1986 [Re: Marty]
elbert Offline
You'll wake the Sahara.
The Dive Shops Daily Blog

#496312 - 10/01/14 03:09 PM Re: Quietest Atlantic Hurricane Season Since 1986 [Re: Marty]
Katie Valk Offline


Me saying the same thing. Quiet
Belize based travel specialist

#496379 - 10/03/14 09:07 AM Re: Quietest Atlantic Hurricane Season Since 1986 [Re: Marty]
Marty Online   happy
me too.... some folks aren't superstitious at all i guess. hard to believe... i could barely even post that...

#496380 - 10/03/14 12:37 PM Re: Quietest Atlantic Hurricane Season Since 1986 [Re: Marty]
Katie Valk Offline
Belize based travel specialist


Click for excellent scuba lessons with Elbert Greer!

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