Forecasters have an apparent better understanding of a tropical disturbance system approaching the Leeward Islands in the Caribbean Sea.
At 4 p.m. EDT, the National Hurricane Center reported that data from an Air Force Reserve Hurricane Hunter indicated the the circulation associated with the small low pressure area is "poorly defined."
"The aircraft did, however, find a small area of tropical-storm-force winds on the northeast side of the low.
"Environmental conditions are expected to be conducive for some development during the next day or so, and a tropical depression or tropical storm could still form while the system moves west-northwestward at around 20 mph across the Lesser Antilles," the Hurricane Center said.
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The mountains of Hispaniola could limit development during the first part of the week, "but conditions are expected to become more conducive for development by Sunday when the system is forecast to move near or over the Bahamas," the Hurricane Center said.
Regardless of possible formation, gusty winds and heavy rain were expected to fall across portions of the Lesser Antilles, Puerto Rico and the Virgin Islands through Friday, and over Hispaniola late Friday and Saturday.
Some earlier models had the system heading towards Florida, but the latest map of "spaghetti models" at WUnderground.com projected the system heading to the northeast after passing north of Puerto Rico.
The Hurricane Hunter is scheduled to investigate the system again Friday afternoon.
The chance of formation remains at 50 percent over the next 48 hours, and 70 percent over the next five days, according to the Hurricane Center.