[6] When formative banding and cloud tops were improving and cooling late on the same day, the JMA further upgraded the broad system to a severe tropical storm.

[7][8] Tracking along the southwestern periphery of the deep-layered subtropical ridge on September 24, Megi was trying to form an eye that prompted both of the JMA and then the JTWC upgrading it to a typhoon.

Located in an area of low vertical wind shear and above warm sea surface temperatures near 30°C, diurnal weakening of convection still continued to occur, especially over the northern half of the system.

[9][12] With excellent radial outflow tapping into westerlies and a large tropical upper tropospheric trough (TUTT) cell to the east, a defined eye remained absent from the typhoon.

[13] After completing an eyewall replacement cycle on September 26, Megi eventually started to strengthen more in the afternoon, resulting in a ragged but larger eye embedded in this large typhoon.

[14][15] The JMA indicated that Megi had reached its peak intensity at 18:00 UTC, with ten-minute maximum sustained winds at 155 km/h (100 mph) and the central pressure at 940 hPa (27.76 inHg).

[22][23] By October 1 the death toll in Taiwan had risen to 8 - five due to indirect causes, such as falls and traffic accidents, and three people who died when a landslide destroyed their house in southern Kaohsiung County.

[24] Early estimates suggested Taiwan's agricultural sector suffered losses of NT$1.03 billion (US$31.9 million), with around 19,000 hectares of crops damaged in total.

[citation needed] By September 29 the total amount of damages in the agricultural sector had risen to NT$1.31 billion (US$42 million), with Yunlin County in western Taiwan accounting for more than a quarter of all of them.

[26] The typhoon left at least one person dead as it made landfall in Fujian, while 27 others were missing after a massive landslide engulfed part of a village in the eastern Zhejiang Province, swallowing up dozens of houses.