Hurricane season is June 1st to November 30th, however, on April 19, 2017 Subtropical Depression One formed in the Atlantic Ocean. Maximum sustained winds of the system are at 35 mph located in the eastern Atlantic moving North at 12 mph.
Even though a subtropical depression looks like a typical tropical depression, the two are very different. Like a tropical cyclone, a subtropical cyclone is a closed, non-frontal low pressure system that forms over water. Unlike a tropical cyclone, subtropical cyclones lack a dense overcast and have a cold core. In a subtropical cyclone, the heaviest thunderstorm activity is away from the center of circulation unlike a tropical cyclone where the heaviest thunderstorm activity is circulating the center.
The National Hurricane Center is not expecting this system to intensify to a tropical storm. The subtropical depression is expected to stay over open water in the eastern Atlantic. The discussion from the National Hurricane Center is as follows:
At 500 PM AST (2100 UTC), the center of Subtropical Depression One
was located near latitude 32.4 North, longitude 40.0 West. The
depression is moving toward the north near 12 mph (19 km/h), and
this motion is expected to continue tonight and early Thursday.
Maximum sustained winds are near 35 mph (55 km/h) with higher gusts.
Little change in strength is anticipated tonight, and the
subtropical depression is forecast to become absorbed by an
approaching extratropical low on Thursday.
The estimated minimum central pressure is 996 mb (29.42 inches).
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ⓒ Meteorologist Brandie Cantrell