Atlantic May Spawn New Tropical Systems Into Next Week

By By Alex Sosnowski, AccuWeather.com senior meteorologist.
September 19, 2015, 9:07:09 AM EDT

While Tropical Depression Nine is likely to diminish on Friday, Tropical Depression 10 formed Friday morning.

Another system has the potential to develop in the tropical Atlantic into next week.

The next names on the list of tropical storms in the Atlantic are Ida and Joaquin. There is a very good chance that at least one new tropical storm will be named into next week.

As of 11 a.m. EDT Friday, Tropical Depression Nine was about 955 miles east-northeast of the Lesser Antilles.

The system has missed its chance to become a tropical storm.

According to AccuWeather Hurricane Expert Dan Kottlowski, strong wind shear will cause this system to degenerate further.


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Current sustained winds with the system are 30 mph.

A system that has developed circular motion with showers and thunderstorms must have sustained winds of 39 mph or greater to be dubbed a tropical storm.

Steering winds will cause the system to drift to the north into over the central Atlantic. As a result, the system is not a threat to the United States or the Caribbean.

A second system located southwest of the Cape Verde Islands has become Tropical Depression 10 on Friday morning.


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According to AccuWeather Meteorologist Becky Elliott, "This system will track farther west than Tropical Depression Nine."

Tropical Depression 10 is also expected to curve northward and wind up over the middle of the Atlantic.

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"As it moves farther north, it will encounter stronger wind shear," Kottlowski said.


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The area of disturbed weather near Florida contains some of the leftover moisture from Grace.

Environmental conditions around Florida are not favorable for development in the short term.

"This system will be over warm water but under the influence of strong wind shear. This wind shear could prevent this system from becoming better organized at first," Kottlowski said.


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This feature could slowly organize as it drifts off the East coast of the United States later this weekend into next week, provided it can overcome strong winds aloft or the winds aloft decrease.

"If the shear were to relax as suggested early next week, it might have the chance to evolve into an organized tropical system," Kottlowski said.

The area off the East coast of the U.S. will remain a spot for potential tropical development through next week.

"It's possible the system might wind up enough to create rough and dangerous surf over the upper Florida east coast to the Outer Banks of North Carolina," Kottlowski said.

"So far, nine tropical systems have developed in the 2015 Atlantic Hurricane Season," Elliott said. "The most recent system [to acquire a name] was Henri, which brought rain and wind to western Europe as a tropical rainstorm this week.

Throughout the tropical Atlantic and over much of the western part of the basin, waters are warm enough to support development.

AccuWeather will continue to provide updates across the Atlantic and all other basins.

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