The storm struggled to make deep convection wrap around itself due to vertical wind shear and dry air since formation, until it passed near Kyushu on August 1.

Although not being a fully warm-core system initially, it intensified into a tropical depression according to the Japan Meteorological Agency (JMA), when sea surface temperature ranged from 29 to 31 °C.

[4] Late on the same day, JTWC upgraded Damrey to a tropical depression, with a partially exposed LLCC under moderate northwesterly vertical wind shear.

[5] Damrey drifted southwestward slowly on July 29, as it was positioned south of a col region produced by an upper-level mid-latitude shortwave trough digging east of Japan.

[7] By late on July 30, Damrey intensified into a severe tropical storm northeast of Chichi-jima and began to accelerated west-northwestward along the southern periphery of a deep-layered subtropical ridge to the north.

[8] The storm started to rebuild central convection on July 31, yet troughing and dry air entrainment degraded outflow over the southern portion.

[9] On August 1, deep convection finally wrapped around the LLCC because of tracking over the warmest regions of the Kuroshio Current, as well as dry air began to weaken.

At the moment, the typhoon featured a 25 nautical miles (46 km; 29 mi) ragged eye with a symmetric eyewall, yet deepest convection was mostly confined to the northern semi-circle.

Damrey was still tracking along the southern periphery of a deep-layered subtropical ridge anchored over Kyushu, Japan, when the system had a 20 nautical miles (37 km; 23 mi) ragged eye with a symmetric eyewall.

A half of day later, the system weakened into a tropical depression northeast of Binzhou, before it turned northeastward and arrived at the Bohai Sea.