updated 8/14/2008 10:21:48 AM ET 2008-08-14T14:21:48

Tropical Storm Iselle gained a little strength as it swirled Thursday off Mexico's southern Pacific coast.

According to the National Hurricane Center in Miami, the storm's maximum sustained winds have increased to near 50 mph, a slight increase from when the storm formed Wednesday. But little change in strength is expected over the next few days.

Iselle's center was located about 355 miles south-southeast of the southern tip of Baja California, Mexico.

The storm is moving toward the west-northwest near 8 mph, taking it farther out to sea.

The storm was expected to move over cooler waters and weaken late in the week.

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