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.
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).
JTWC reported it had winds of 55 km/h (35 mph) during that time.
On the next day at 1200 UTC, JTWC began tracking the storm as a tropical depression.
The system was upgraded to a tropical storm at 1800 UTC, with winds of 65 km/h (40 mph), and was given the name Mary by the warning center.
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).

On June 5, JMA recorded Mary's lowest pressure reading at 980 hPa (29 inHg).
Two days later, the storm had intensified to 110 km/h (70 mph), and was traveling faster towards Hong Kong.
On June 7, at 0600 UTC, Mary quickly strengthened to a typhoon, with winds up to 130 km/h (80 mph).
Mary peaked at 0600 UTC on June 8, just offshore of Hong Kong, with winds of 150 km/h (90 mph), and JTWC estimated the pressure was 975 hPa (28.8 inHg).
Twelve hours later, the storm made landfall on Hong Kong northwest of Kowloon.
Inland, the typhoon slowly weakened to 90 km/h (55 mph) by June 10, back to a tropical storm.
The system gained speed as it traveled through Guangdong and Fujian provinces.
Mary soon reemerged back to the ocean later than day, began restrengthening, and was found to have 110 km/h (70 mph) winds, recorded by the U.S. Navy.
The storm briefly became a typhoon at 1800 UTC, and reconnaissance aircraft recorded winds just above typhoon strength, although the circulation did not have eyewalls.
It was downgraded to a tropical storm on June 11 at 1200 UTC.

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).
Mary continued to weaken until June 12, when JTWC and JMA declared the storm had become extratropical southeast of Tokyo.
JMA continued to track the extratropical cyclone until it reached the International Date Line on June 18.
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. 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). JTWC reported it had winds of 55 km/h (35 mph) during that time. On the next day at 1200 UTC, JTWC began tracking the storm as a tropical depression. The system was upgraded to a tropical storm at 1800 UTC, with winds of 65 km/h (40 mph), and was given the name Mary by the warning center. 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).
On June 5, JMA recorded Mary's lowest pressure reading at 980 hPa (29 inHg). Two days later, the storm had intensified to 110 km/h (70 mph), and was traveling faster towards Hong Kong. On June 7, at 0600 UTC, Mary quickly strengthened to a typhoon, with winds up to 130 km/h (80 mph). Mary peaked at 0600 UTC on June 8, just offshore of Hong Kong, with winds of 150 km/h (90 mph), and JTWC estimated the pressure was 975 hPa (28.8 inHg). Twelve hours later, the storm made landfall on Hong Kong northwest of Kowloon. Inland, the typhoon slowly weakened to 90 km/h (55 mph) by June 10, back to a tropical storm. The system gained speed as it traveled through Guangdong and Fujian provinces. Mary soon reemerged back to the ocean later than day, began restrengthening, and was found to have 110 km/h (70 mph) winds, recorded by the U.S. Navy. The storm briefly became a typhoon at 1800 UTC, and reconnaissance aircraft recorded winds just above typhoon strength, although the circulation did not have eyewalls. It was downgraded to a tropical storm on June 11 at 1200 UTC.
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). Mary continued to weaken until June 12, when JTWC and JMA declared the storm had become extratropical southeast of Tokyo. JMA continued to track the extratropical cyclone until it reached the International Date Line on June 18.
Typhoon Mary (1960)