In China, dikes and dams were damaged severely, multiple public buildings collapsed, and destroyed large swaths of farmland.

In early June, a trough extended from Taiwan to the South China Sea, and a small circulation was found at the southwestern part of it.

[1] The Japan Meteorological Agency (JMA) designated the system as a tropical depression on June 2, with a pressure reading of 1,000 hectopascals (30 inHg).

[1] By 1800 UTC of June 4, Mary slowly began turning northward near the Paracel Islands, and had intensified slightly to 75 km/h (45 mph).

Mary peaked at 0600 UTC on June 8, just offshore of Hong Kong, with winds of 150 km/h (90 mph),[4] and JTWC estimated the pressure was 975 hPa (28.8 inHg).

[1][4] Mary soon reemerged back to the ocean later than day, began restrengthening,[1] and was found to have 110 km/h (70 mph) winds, recorded by the U.S. Navy.

[4] Another reconnaissance aircraft flew into Mary again at 2330 UTC, reporting that there was no eyewall in the storm and recorded winds up to 65 km/h (40 mph).

[1] Mary continued to weaken until June 12, when JTWC and JMA declared the storm had become extratropical southeast of Tokyo.

[7] Meanwhile, a joint military exercise by the South Korean and American Marines were delayed by one day due to the storm.

10 warning signal was not strictly justified according to international procedures, since sustained surface winds of 119 km/h (64 kn) were not observed.

Landslides, and other fallen debris blocked roads,[1] and weak refugee shacks in the hills, made out of tin and tar paper, quickly collapsed.

[13] About 260 kilometres (160 mi) southeast of Hong Kong,[6] the cargo ship Sheng Lee sank during the typhoon.

[6] Off the coast of Mainland China, in the Matsu Islands, many fishing boats were damaged by the heavy seas and the torrential rainfall.

[7] In Taiwan, downtown Taipei received significant flooding, and some rice crops on the south part of the island were damaged.