JACKSONVILLE, Fla. -

Tropical Storm Jerry weakened in the open Atlantic Ocean on Tuesday morning, but an area of disturbed weather in the Caribbean is becoming more organized and forecasters give it a 50 percent chance of becoming something tropical by the weekend.

The U.S. National Hurricane Center says the Jerry's maximum sustained winds early Tuesday decreased to near 45 mph, but forecasters say some fluctuations in strength are possible over the next two days.

The 10th named storm of the season is centered about 1,310 miles east of Bermuda and is nearly stationary. A slow, erratic motion is expected during the day.

Closer to land, development of a low pressure system over the western Caribbean is possible during the next couple of days while it moves northwestward at around 10 mph.

Locally heavy rains are likely in over Jamaica, Cuba and the Cayman Islands over the next two days.

National Hurricane Center forecasters give this disturbance a 30 percent chance of becoming a tropical system within 48 hours and a 50 percent chance over the next five days.

Some computer models develop this system into a tropical storm by Friday, bringing into the panhandle of Florida. If this storm does get a name, it would be "Karen."