On the following day, the system intensified into a tropical storm, which was named Calvin.

The system intensified to a tropical storm 24 hours after forming.

By September 26, the system had developed strong outflow and was intensifying.

Over the following days, the system quickly intensified as it began moving slowly westward.

Further rains fell as the system intensified and neared the country.

The system slowly intensified, eventually becoming a major hurricane by September 24.

It is unknown if the system intensified into a tropical storm.

The system gradually intensified as it moved slowly towards the west.

Early on September 6, the system intensified into a typhoon.

Over the following two days, the system tracked generally northward and quickly intensified.