Hurricane Vance is expected to begin weakening Mondays, according to the National Hurricane Center in Miami.
The storm, which is circulating 105 mph winds and moving toward the north-northwest around 12 mph, is currently about 490 miles west-southwest of Manzanillo, Mexico.
Vance is expected to make a turn toward the north Monday night followed by a turn toward the north-northeast on Tuesday. Weakening was forecast to commence Monday.
Hurricane-force winds current extend outward up to 15 miles while tropical storm-force winds outward up to 125 miles.
Forecasters are also monitoring disorganized showers and thunderstorms located several hundred miles south of Acapulco, Mexico. The showers and thunderstorms are associated with a broad area of low pressure.
Environmental conditions are expected to be somewhat conducive for gradual development during the next 48 hours while it moves west-northwestward or northwestward. Upper-level winds are forecast to become less favorable on Wednesday and development after that time is not likely, according to forecasters.
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.