The system intensified fairly quickly, going from a minimal tropical storm to hurricane status in a 24 hour period.

It became a minimal tropical storm before hitting central Japan on the night of August 4.

Abby rapidly weakened to a minimal tropical storm a few days thereafter.

By the morning of May 20, the system had weakened to a minimal tropical storm and turned due west.

The cyclone remained a minimal tropical storm for most of its lifetime.

Calvin then moved over cooler water and subsequently weakened to a minimal tropical storm.

It continued to weaken, and was only a minimal tropical storm by the afternoon of August 21.

It headed north and peaked as a minimal tropical storm on October 1.

The system briefly weakened to a minimal tropical storm before strengthening again.

It became a minimal tropical storm during this acceleration.