Michael started on October 15 as a subtropical depression, and it moved slow at first.

Felapi turned back to the southeast as a subtropical depression.

The system gradually became better organized and was classified a subtropical depression on November 2.

The watch was discontinued after Andrea weakened to a subtropical depression.

Convection over the new system was poorly organized, and it became a subtropical depression late on June 24.

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

It moved west, and the next day it became into a subtropical depression.

Later that day, the storm had become sufficiently organized to be classified as a subtropical depression.

As the subtropical depression drifted westward, it became further organized.

Dry air caused Allison to become a subtropical depression.