The highest risk tropical storm is located over South Florida and has a 90 percent chance of cyclone formation in the next five days.
These showers and thunderstorms are moving westward to west-northwestward at 10 to 15 miles per hour and could be a concern for the eastern Caribbean islands over the weekend and into the work week. A tropical depression could form before moving away from the East Coast, north through the Western Atlantic.
There are no coastal watches or warnings in effect. It is expected to become Tropical Storm Dorian late Saturday night or early Sunday morning.
The Weather Channel meteorologist Jim Cantore urged residents in the Bahamas to keep an eye on this disturbance.
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The weak area of low pressure is causing heavy rain in the Bahamas and will increase rain chances in southern Florida.
The system east of the Lesser Antilles has now become tropical depression 5.
It is a very small system so despite some wind shear it is expected to strengthen through the next few days as it moves toward the far eastern islands of the Caribbean. This will boost our rain chances as we head through the weekend and into the start of next week. The system has changed little in organization since this afternoon, but environmental conditions are expected to be conducive for gradual development, and a tropical depression is likely to form over the weekend.