Shower and thunderstorm activity associated with an area of low pressure over the western Caribbean Sea could turn into a tropical storm or hurricane during the next week, according to the National Hurricane Center.
"Some development of this low is possible during the next couple of days while it moves northwestward at around 10 mph," the Hurricane Center said at 2 p.m. EDT.
Forecasters gave it a 30 percent of becoming a tropical storm during the next 48 hours, and a 50 percent chance of developing during the next five days.
"Upper-level winds are expected to be marginally conducive for development when the disturbance moves over the southern Gulf of Mexico later this week," the Hurricane Center said.
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Locally heavy rains could affect parts of Jamaica, Cuba and the Cayman Islands during the next day or two, the Hurricane Center said.
Meanwhile, Tropical Storm Jerry is weakening as it swirls over the Atlantic.
The U.S. National Hurricane Center says the storm's maximum sustained winds early Tuesday have decreased to near 45 mph (75 kph). But forecasters say some fluctuations in strength are possible over the next two days.
The storm is centered about 1,310 miles (2,110 kilometers) east of Bermuda and is nearly stationary. A slow, erratic motion is expected during the day.
Jerry is the 10th tropical storm of the Atlantic season.