The depression quickly developed into a tropical storm later that day.

It developed into a tropical storm the following morning.

Later that day, it developed into a tropical storm.

It tracked west-northwestward, and developed into a tropical storm the following day.

As we suspected, she has already developed into a dangerous storm.

The system turned northward, developing into a tropical storm.

The system drifted north-northwest, developing into a tropical storm that night.

The system developed into a tropical storm on August 20.

In the course of the afternoon the weather deteriorated and developed into a full storm.

The system developed further into a cyclonic storm on May 29 as it moved to the north.