A new tropical storm, Darby, has formed off the coast of Mexico, US weather forecasters said Wednesday.

The Miami-based National Hurricane Center said that Darby at 0900 GMT was about 335 miles, (540 kilometers) south-southeast of Salina Cruz, Mexico.

The storm had maximum sustained winds of 40 miles (65 kilometers) per hour, and was moving in a northwesterly direction at about nine miles (15 kilometers) per hour.

The storm is the second one churning off the coast of Mexico, with Hurricane Celia some 770 miles (1240 kilometers) off the southern tip of Baja, California.

Celia, with maximum sustained winds of 85 miles (140 kilometers) per hour, was moving west at 10 miles (17 kilometers) per hour, the NHC said.

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