With just about a month left in the eastern Pacific’s hurricane season, Mexico is once again the target of a tropical system on its western coast. The latest system, Tropical Storm Vance, was drifting west in the Pacific Ocean with top winds of 40 miles (64 kilometers) per hour yesterday, the National Hurricane Center in Miami said. The projected track raised the possibility Mexico will take another tropical hit in the next week. “It isn’t out of the question, it is going to take a loop to get there,” said Tom Kines, a meteorologist at AccuWeather Inc. in State College, Pennsylvania.