 On October 20, following modest organization, the National Hurricane Center (NHC) assessed a high potential for it to become a tropical cyclone within 48 hours, tagging it "Invest 99L".By the next day, the convection had decreased, although barometric pressures in the area remained low, a trademark of development.Convection gradually increased as the day went on, while the system slowed and became nearly stationary over the western Caribbean.