U.S. weather forecasters are tracking two Atlantic storm systems.

The U.S. National Hurricane Center in Miami, Florida says a tropical depression named Ophelia is expected to strengthen into a tropical storm Wednesday. Ophelia, located east of the Leeward Islands, has top sustained winds of 55 kilometers-per-hour and is expected to turn northward as it strengthens over the next several days.

Far out in the Atlantic, the hurricane center is monitoring Tropical Storm Philippe as it continues to weaken. Philippe has top winds of 65 kilometer-per-hour. No coastal watches or warnings have been posted. Phillippe is expected to be downgraded to a tropical depression Wednesday.

In the Pacific, Hurricane Hilary has slightly weakened as it swirls off Mexico's Pacific coast. The storm is expected to gradually lose power and be downgraded to a tropical storm by Thursday.

The National Hurricane Center said Tuesday that Hilary had weakened to a category 2 storm on the five-point scale of hurricane intensity, with winds of 165 kilometers per hour.

The storm is not expected to make landfall, and no coastal watches or warnings are in effect.

However, forecasters warn that swells generated by the hurricane are affecting portions of the southwestern coast of Mexico and the southern Baja California region. Forecasters say these swells are likely causing life-threatening surf and rip current conditions.