Update as of 8 AM Monday:
Thunderstorms have become better organized with a tropical wave about 150 miles east of Barbados. The National Hurricane Center says a tropical depression is likely to form later Monday or Monday night as it approaches the Lesser Antilles.
Original story as of 9:30 PM Sunday:
At least two tropical waves are showing signs of developing into a depression or storm in the next five days. One of them is on track to reach Puerto Rico by Tuesday, then possibly the Florida Straits or Bahamas by week's end.