Joan formed from a surface center to the northeast of Guam on August 23, in which Japan Meteorological Agency began to track and classify the system as a tropical depression on the next day.

[1] Shortly afterwards, Joan attained peak strength as a Category 5 equivalent super typhoon on the Saffir–Simpson hurricane scale with winds of 165 knots (190 mph) before making landfall in Taiwan as a 160 knots (180 mph) typhoon, which was according to JTWC is the strongest landfall in the recorded history at the time.

Extratropical remnants of Joan quickly traversed through South Korea and Japan before being last noted on 18:00 UTC, September 2.

In South Korea, Joan caused several rivers on the Korean peninsula to overflow their banks, killing 17 people and injuring 21.

[1] In the next six hours before making landfall, Joan attained the peak strength as a Category 5 equivalent typhoon on the Saffir–Simpson hurricane scale with winds of 170 knots (200 mph), while the pressure rises up into 900 millibars (27 inHg).

Shortly after reaching peak strength, Joan made landfall near Hualien City, Taiwan with the winds of 160 knots (180 mph).

On September 2, extratropical remnants of Joan traversed through central Japan before being last noted at southeast of Tokyo in 18:00 UTC of the same day.

The counties of Nantou and Pingtung bore the brunt of crop damage, with significant losses reported to banana, papaya, and rice.

[5] Rainfall from Joan caused several rivers on the Korean peninsula to overflow their banks, killing 17 people and injuring 21.