The tropics are still roiling even as the hurricane season nears an end.

A mass of showers and thunderstorms northeast of the Leeward Islands has become Tropical Storm Sebastien.


The late-season boil is no threat to the U.S. and is expected to get caught up in a frontal system as it moves northwestward through the open Atlantic.


National Hurricane Center forecasters had given the system an 80 percent chance of forming Tuesday morning.


Tropical Storm #Sebastien has formed in the central Atlantic - the 18th named storm of the 2019 Atlantic #hurricane season to date. 2019 is the 9th Atlantic season on record with 18+ named storms. Others are: 1887, 1933, 1969, 1995, 2005, 2010, 2011 and 2012. pic.twitter.com/vrHy2ZYXQd

— Philip Klotzbach (@philklotzbach) November 19, 2019

Sebastien is the 18th named storm of the season.


Colorado State University hurricane expert Phil Klotzbach said 20 Atlantic basin storms have earned names after November 17 in the satellite era.


The most recent was Otto in 2016, which formed Nov. 20. Otto grew to a Category 3 hurricane before making landfall in Southern Nicaragua.


Sebastien has 45 mph winds and is 275 miles northeast of the Leeward Islands. It’s traveling at 8 mph.


Tropical storm-force winds extend up to 105 miles from Sebastien’s center.


The last time a storm season reached the S named storm was in 2012 with Hurricane Sandy became a tropical storm Oct. 22.