Miami - The government of the Netherland Antilles issued a tropical storm watch for St. Maarten, Saba and St. Eustatius on Saturday as Ana raced west through the Atlantic.

Meanwhile, Tropical Storm Bill, the second named storm of the Atlantic season, formed further to the east and forecasters said they expected it to strengthen.

The National Hurricane Center said Saturday evening that Ana had maximum sustained winds near 40 mph and was moving west near 17 mph. It was about 730 miles east-southeast of the Leeward Islands.

The Hurricane Center said residents there and in the Virgin Islands and Puerto Rico should monitor Ana's progress. The tropical storm watch for the Netherland Antilles meant tropical storm conditions were possible, probably within 36 hours.

Tropical Storm Bill also had maximum sustained winds near 40 mph and was moving west near 16 mph. It was expected to get stronger within the next day or so and was about 820 miles west-southwest of the Cape Verde Islands.

Meanwhile, Hurricane Guillermo was still swirling in the open Pacific but had weakened to a Category 2 storm with winds near 110 mph. Guillermo was expected to weaken further as it headed over cooler waters. It was moving west-northwest near 14 mph and was about 1,605 miles west of the southern tip of Mexico's Baja California peninsula.