Hurricane Isaac (2006)
The SHIPS models predicted that the system would become a hurricane with maximum sustained winds of 88 knots (150 km/h) after 120 hours.  However, the system was slow to organize and a Tropical Cyclone Formation Advisory was not issued by the National Hurricane Center (NHC) until four days later. The NHC, however, decided the convection was too ephemeral to justify classification as a tropical depression and the TCFA was discontinued. Three days later, on September 27 another TCFA was issued, announcing the formation of the ninth tropical depression of the Atlantic season.