The Central Weather Bureau issued heavy rain warnings Friday afternoon for fifteen cities and counties due to a strong convective system above Taiwan.
The affected areas include Taipei, New Taipei, Keelung, Taoyuan, Hsinchu, Miaoli, Taichung, Nantou, Yunlin, Chiayi, Tainan, Kaohsiung, Pingtung, Yilan and Hualien, forecasters said.
Among them, the southernmost Taiwan county of Pingtung has been hit with "extremely heavy rain" -- defined as 200 mm of rain in a 24-hour period or 100 mm of rain in a three-hour time frame -- the bureau said.
In fact, between 2-3 p.m., Majia Township in Pingtung had already topped the country with 92 mm of accumulated rainfall, bureau data showed.
Lightning, gusty winds, as well as flooding and mudslides in mountainous areas are likely, the bureau warned.
Also, a tropical storm could form near Guam between Saturday and Sunday and is likely to affect weather in Taiwan during the Mid-Autumn Festival holiday period Sept. 15-18, said Wu Der-rong (???), a meteorologist and adjunct associate professor of atmospheric sciences at National Central University.
Should this system become a tropical storm, it could approach the Ishigaki and Miyako islands in Japan's Okinawa Prefecture on Sept. 14, Wu said, citing a forecast from the U.S. Joint Typhoon Warning Center.
Nevertheless, there remain many variables that will affect whether the storm will reach Taiwan, he said.
Source: Focus Taiwan News Channel