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* Ernesto expected to make landfall in Mexico
* May reach hurricane strength by mid-week
* Tropical Storm Florence fading in eastern Atlantic (Adds detail on location and wind speed of Ernesto and Florence)
By Michael Connor
MIAMI, Aug 5 (Reuters) - Tropical Storm Ernesto kept on a westerly course in the Caribbean Sea on Sunday and was expected to strengthen slowly over the coming 48 hours while heading towards Mexico's Yucatan, U.S. forecasters said.
Wet and windy conditions were felt in Jamaica on Sunday which caught the outer rain bands of Ernesto, according to Jamaica's emergency management office.
Ernesto's winds and rain failed to dampen the spirits of many Jamaicans who gathered in large street parties in the capital Kingston to watch their star sprinter Usian Bolt race to victory in the 100 meters track final at the Olympics Games.
The U.S. National Hurricane Center in Florida said tropical storm conditions were possible along the coast of Honduras by late Monday. A tropical storm watch advisory was also issued for Grand Cayman.
Ernesto was following a predicted track that should keep it at sea until a forecast landfall, possibly at hurricane strength, over Mexico's Yucatan peninsula on Wednesday.
The storm was 235 miles (375 km) east of the coast of Honduras at around 11 p.m. EDT (0300 GMT) on Sunday, moving west at about 15 mph (24 kph) with maximum sustained winds around 50 mph (85 kph).
Heavy rains were experienced throughout Sunday in Hispaniola and Puerto Rico. Three to 6 inches (7.6 to 15.2 cm) were predicted in Jamaica and authorities warned of flooding in low-lying areas along the south coast. Showers and thunderstorms, sometimes severe, were possible on the islands of Aruba, Curacao and Bonaire off Venezuela's northern coast.
"Some strengthening is forecast as Ernesto moves over the northwestern Caribbean Sea on Monday and Tuesday," the U.S. forecasters in Miami said.
Ernesto will be deemed a hurricane if its winds reach 74 mph (119 kph).
Forecasters expect Ernesto to move into the southern part of the Gulf of Mexico by Thursday but they said it was too early to know whether it could disrupt oil and gas operations in the gulf.
The National Hurricane Center forecasters said another tropical storm, called Florence, formed on Saturday in the eastern Atlantic and was moving west in open waters. As of early Sunday, forecasters said Florence was about 925 miles (1,485 km) west of the Cape Verde Islands.
With maximum sustained winds of 40 mph (65 kph), Florence was the sixth named storm of the Atlantic-Caribbean hurricane season, but it faded on Sunday as it moved west-northwest at 13 mph (20 kph).
"Additional weakening is expected ... and Florence is forecast to become a tropical depression on Monday," the Hurricane Center reported.
August and September are usually the most active months of the Atlantic-Caribbean hurricane season, which runs from June 1 to Nov. 30. (Additional reporting by David Adams; Editing by David Brunnstrom)