It developed in the eastern Atlantic Ocean, an unusual region for late-season tropical cyclogenesis.

Nonetheless, the system was able to generate a well-defined centre convecting around a warm core on 4 October.

The subtropical nature of this unnamed system was determined several months after the fact, while the National Hurricane Center was performing its annual review of the season.

[1] Early on 4 October, convection increased as the surface low organized itself, and the system became a subtropical depression.

[2] Around the same time, the depression turned northeast into a warm sector ahead of an oncoming cold front and strengthened into a subtropical storm.

The system continued to track northeast and strengthened slightly, reaching its peak intensity of 85 km/h (53 mph) as it approached the Azores that evening.

[5] Satellite imagery suggested that the system was briefly a tropical storm as the warm core was found; however, the widespread wind field and the presence of an upper-level trough confirmed that it was only subtropical.