National Hurricane Center
On October 11, 1970, satellite images indicated that a tropical depression developed north of Hispaniola. However, according to post-analysis, a subtropical depression actually formed on October 12 at 1200 UTC. The depression slowly intensified over the next few days, and became a subtropical storm on October 12, thought this was operationally unnoticed by the National Hurricane Center. By October 13, satellite imagery indicated that convection associated with the depression merged with a weak stationary front. As a result, the National Hurricane Center no longer considered it purely tropical and classified the system as a "subtropic storm" on October 14. Later that day, the National Hurricane Center began issuing special bulletins for the storm, indicating the possibility of the system acquiring tropical characteristics.