(October 13, 2008)--The 14th tropical storm of the 2008 hurricane season was downgraded to a tropical depression Monday morning, just hours after being named a tropical storm.

Tropical Depression Nana was located about a thousand miles west of the Cape Verde Islands.

Forecasters at the National Hurricane Center expect Nana to weaken completely Monday night or Tuesday as it moves slowly west-northwest over the open waters of the central Atlantic Ocean.

Meanwhile, a new storm was brewing in the Caribbean Sea.

Tropical Depression Fifteen was located about 350 miles southwest of Puerto Rico Monday afternoon, and meteorologists say it could soon strengthen to become the season's 15th named tropical storm, Omar.

A tropical storm watch was posted Monday for Puerto Rico and the U.S. Virgin Islands, the British Virgin Islands, and a portion of the Dominican Republic.

The storm was nearly stationary, but forecasters expected the storm to accelerate to the northeast on Tuesday.