Subtropical Depression Forms Far Off the U.S. Coast

Subtropical Depression Forms Far Off the U.S. Coast

The National Hurricane Center has been watching a circulation of thunderstorms in the mid-Atlantic for several days and this morning classified the system as Tropical Depression One.

Forecasters said the depression will remain weak and be absorbed Thursday by a larger low pressure system.

The 2017 Atlantic tropical storm and hurricane names list starts with Arlene and ends with Whitney. They think there will be 11 named storms, of which, four will become hurricanes, and two will become major hurricanes (Category 3 or stronger).

The depression known as Subtropical Depression One was moving slowly north in the open ocean, not expected to strengthen, impact land, or last for more than 24 hours.

Eleven to 15 tropical storms and hurricanes will form in the Atlantic basin including the Gulf of Mexico and Caribbean Sea, said Lian Xie, a professor of marine, earth and atmospheric sciences. This is rare event but not unheard of.

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Speaking in terms of climatology, if it were to achieve a name, it would be the first named April system in the Atlantic since 2003.

The storm had peak winds of 35 miles per hour.

Subtropical systems tend to be less organized, and lack the tell-tale shape of a tropical storm or hurricane.

Water temperatures are warmer than average near the storm.

Two named storms formed before the official start in 2016: Hurricane Alex in January and Tropical Storm Bonnie in May. Maximum sustained winds are also much farther from the center, while the strongest winds in a tropical storm are close to the center. Unlike tropical cyclones, subtropical cyclones are generally cold-core in the upper troposphere, often being associated with an upper-level low or trough.

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