updated 9/18/2009 10:11:29 AM ET 2009-09-18T14:11:29

Tropical Storm Marty is weakening as it moves over the Pacific off the coast of Mexico.

Marty's maximum sustained winds have decreased to 40 mph early Friday. And the tropical storm is expected to continue weakening.

Marty, the 13th named storm of the Eastern Pacific hurricane season, is centered about 330 miles west-southwest of the southern tip of Mexico's Baja California peninsula and moving northwest near 6 mph.

The National Hurricane Center in Miami said the storm should fall back to tropical depression status later Friday.

The current forecast track has the storm drifting farther out to sea in the next few days.

The Pacific Ocean has been far busier this year than the Atlantic when it comes to storms. Of 16 tropical depressions that have formed so far in the eastern Pacific, six became hurricanes and seven became tropical storms.

The Atlantic, meanwhile, has seen seven tropical depressions. Of those, two became hurricanes and four became tropical storms.

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