The depression began to slowly intensify as it moved towards the west-northwest and Tropical Storm Luke was named on September 15.

Luke reached peak intensity prior to recurving to the northeast and weakening due to increased shear.

Tropical Storm Luke then paralleled the southeastern Japan coastline before transitioning into an extratropical cyclone.

A total of 103 bullet trains were cancelled and 160 others delayed between Tokyo and Osaka, which left 315,000 people stranded.

An area of disturbed weather that would later become Tropical Storm Luke was first noted by the Joint Typhoon Warning Center (JTWC) early on September 13.

[1] The disturbance was upgraded into a tropical depression by the Japan Meteorological Agency (JMA) the following morning.

[2][nb 1] As the disturbance tracked west-northwestward, passing near Saipan, improved upper-level anticyclonic outflow and falling surface pressures led to the issuance of a Tropical Cyclone Formation Alert at 11:30 UTC on September 14.

At 18:00 UTC, the JTWC designated the system Tropical Depression 20W, based on synoptic data that indicated the disturbance developed a closed surface circulation.

[1] Early on September 15, the JTWC upgraded the depression into Tropical Storm Luke, with the JMA following suit six hours later.

On September 17, satellite imagery indicated that the circulation had become less defined and the overall system had lost organization.

The JTWC issued its final warning at noon on September 19,[1] with the JMA declaring Luke extratropical that evening.

[9] In Wakayama Prefecture, the storm, in conjunction with a cold front, dropped heavy rains, which damaged 59 homes and roads in 94 locations.

[14] A landslide shattered a house in Mie Prefecture, burying an elderly couple who were subsequently rescued.

[14] Seven construction workers were trapped in Chiba Prefecture after water flooded the tunnel they were working in.

[17] A middle school student was found dead in Aichi Prefecture after being swept away via floodwaters.

A total of 103 bullet trains were cancelled and 160 others were delayed between Tokyo and Osaka, which disrupted travel plans of 315,000 people.