MIAMI (AP) - Subtropical storm Andrea, the first named storm of the Atlantic season, has formed hundred miles (kilometers) southwest of Bermuda.

The National Hurricane Center on Monday tweeted that Andrea had a "well-defined center" with maximum sustained winds of about 40 mph (64 kph). It said in an advisory Monday evening that the storm is centered about 335 miles (540 kilometers) southwest of Bermuda in the western Atlantic and moving northward at 14 mph (22 kph).

Although there are no coastal watches or warnings in effect, the Miami-based center says people in Bermuda should monitor the storm's progress for the next few days. Meteorologists say the storm could strengthen a little overnight but is expected to weaken late Tuesday and dissipate on Wednesday.

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