Tropical Storm Grace came from a large extratropical cyclone that formed on September 27, 2009, to the east of Newfoundland. It began to show signs of becoming a tropical cyclone. By October 1, convection began to form near the center of the storm. The next day, the convection began to disappear, and the National Hurricane Center (NHC) stopped watching it. The storm moved in a loop near the Azores for the next two days. During October 4, convection formed again near the center of the storm. It became a tropical storm near São Miguel Island. However, the NHC first thought it did not become a tropical storm until later.