NHC now has added the potential broad area of low pressure that I posted about early this morning:

Active Systems: The National Hurricane Center is issuing advisories on Tropical Storm Lisa, located over the western Caribbean Sea, and Tropical Storm Martin, located over the central North Atlantic. 1. Southwestern Atlantic: A broad area of low pressure is expected to develop over the weekend across the southwestern tropical Atlantic or the eastern Caribbean. Slow development of the system is possible as it moves generally northward this weekend. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 5 days...low...20 percent.