This is not Subtropical Storm Ana, but Atlantic hurricane season is on its way. (Tania A / Shutterstock)

(Bloomberg) — Subtropical Storm Ana has stalled off the U.S. East Coast after forming overnight, arriving more than three weeks before the official start of the Atlantic hurricane season.

The system, about 170 miles (274 kilometers) south- southeast of Myrtle Beach, South Carolina, had sustained winds of 45 miles per hour and is stationary, according to an 8 a.m. advisory from the National Hurricane Center in Miami. A tropical storm watch is in effect from Cape Lookout, North Carolina, to Edisto Beach, South Carolina.

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