Tropical Storm Vance, which formed Thursday in the Eastern Pacific, is forecast to continue strengthening, according to the National Hurricane Center in Miami.
The storm, which is circulating 45 mph winds and moving toward the south-southwest around 3 mph, is currently about 475 miles south of Acapulco, Mexico. Vance could be upgraded to a hurricane by Sunday.
Tropical storm-force winds currently extend outward up to 60 miles.
National Hurricane Center officials in May predicted 14 to 20 named storms and seven to 11 hurricanes — including three to six major hurricanes — to form this year in the Eastern Pacific Basin. Overall, they gave the 2014 season a 50 percent chance of being above normal, 40 percent chance of being near-normal and a 10 percent chance of being below normal.
The Eastern Pacific averages 15 named storms, eight hurricanes and four major hurricanes each year, according to the center.
The Eastern Pacific hurricane season began May 15 and ends Nov. 30.