After further organization, the system developed into a tropical depression on February 26.

By July 19, the disturbance developed into a tropical depression.

Early on December 21, the system developed into a depression.

The following day, the system developed into a depression as it moved slowly northwestward.

Moving westward, it developed into a tropical depression on the morning of October 15.

Remaining nearly stationary, it gradually developed into a depression two days later.

The system moved westward and developed into a tropical depression on August 30.

The system moved westward and developed into a tropical depression on the 30th.

The system developed into a tropical depression late on August 16.

This can even develop into a clinical depression requiring treatment.