Subtropical depression strengthens into Subtropical Storm Ernest

Tropical Storm Lane 2-day graphical weather outlook. PC NOAA  NHC

Tropical Storm Lane 2-day graphical weather outlook. PC NOAA NHC

That's why the odds of this wave becoming a tropical system sit very low at 10%.

Hurricane-force winds extend 25 miles from the center of the storm, while tropical-storm-force winds extend outward up to 105 miles. Additional strengthening is possible this week.

New named storms have formed far out over the Atlantic and Pacific, though neither poses a threat to land.

Met Service said the system is expected to become a post- tropical cyclone Thursday night or early Friday, and merge with a frontal zone near Ireland and the United Kingdom on Saturday.

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A subtropical storm has characteristics of a mid-latitude cyclone (those winter storms that hit the midwest and east coast that can bleed into spring) and a tropical system with a warm core. Dust from the Sahara Desert across much of the Atlantic and Caribbean as well as stronger-than-usual wind shear have prevented major development thus far this season. Typically, the wind field on a sub tropical storm is wider than a tropical storm.

Ernesto is the fifth named storm of 2018 and the fourth storm to be called subtropical at some point this year.

We are near the peak of the season, but the rest of the Atlantic is expected to be quiet for the next week or so.

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