The typhoon is believed to be one of the main reasons behind the crash of TransAsia Airways Flight 222, which occurred a day after it made landfall.

It initially followed a westward track, then made a sharp northwest turn before making landfall on Taiwan, and then China.

After moving further inland, Matmo slowly curved back northeastwards and became extratropical before its remnants affected the Korean Peninsula.

[4] The origins of Matmo can be tracked back to an area of low pressure that developed in the Intertropical Convergence Zone, about 280 km (170 mi) east of Chuuk on July 9, 2014.

[8] Tracking slowly northwestward, the depression continued to consolidate while the JTWC initiated advisories on it with the identifier 10W.

[9] During the evening of July 17, the JMA upgraded the system to a tropical storm, and assigned it the name Matmo.

Microwave satellite imagery showed improving convective banding despite the overall structure of the storm being slightly elongated.

[17] Increasing wind shear stemming from the subtropical ridge steering the typhoon inhibited further organization.

[18] Tracking well to the southwest of Okinawa, the typhoon increased in both size and organization,[19] with a secondary convective rainband developing along the northern half of the system by July 22.

[21] The storm reached peak intensity on July 22, with maximum sustained winds of 140 km/h (87 mph) and a central barometric pressure of 960 mbar (hPa; 28.35 inHg).

[29] The remnants of Matmo brought generally light to moderate rains across South Korea, with Seoul reporting 13 mm (0.5 in).