The system maintained minimal typhoon status as it developed a large, ragged eye by July 17.

At this time, the system began to lose strength and was downgraded from super typhoon status.

Doug further intensified and attained typhoon status about 18 hours later.

An eye was becoming visible as Doug attained typhoon status.

It weakened below super typhoon status after being at that intensity for five days.

The storm yet again strengthened reaching typhoon status by the 28th.

It moved to the northwest and attained typhoon status on the 16th.

The weather continued to deteriorate and by 26 September had reached typhoon status.

This was because 11 of the 33 storms in the season reached super typhoon status.

Conditions favored strengthening, and Joan reached typhoon status on the 11th.