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Subtropical Depression One Forms in the Atlantic Ocean

19 Apr 2017, 10:26 am

The first tropical system of the season has formed in the Atlantic Ocean, according to the National Hurricane Center. Subtropical Depression One is located in the Central Atlantic, 890 miles west-southwest of the Azore Islands and roughly 1200 miles east of Bermuda.

Showers and thunderstorms continue to spin around the closed circulation, with warming noted on satellite imagery near the center of the storm. Subtropical Depression One is expected to stay well away from any land areas in the Central Atlantic.

The storm has formed in an area of lighter wind shear, but winds aloft are expected to increase as a front approaches from the west. Water temperatures in the area are cold as well, so intensification is not anticipated.

The storm is expected to drift to the north. A cold front moving in from the West near Bermuda will approach the storm in the next 24 hours. The front may absorb the storm, merging it into the line of showers and storms. The life span of Subtropical Depression One is expected to be short.


A subtropical low has characteristics of both a tropical system and regular extra-tropical low pressure center. Subtropical lows requires thunderstorms near the center and warm temperatures in the middle levels of the atmosphere. A fully tropical low would have warming near the center at all levels. Common low pressure systems (extra-tropical) have cold temperatures at their core.

April tropical activity is rare. There have only been four April tropical systems on record, the most recent Tropical Storm Ana in 2003. The other three were tropical depressions in 1992, 1981 and 1973.

For WeatherNation: Meteorologist Mace Michaels

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