
Tornadoes in Taiwan are rare with an average of 4 to 6 tornadoes annually. Most of these tornadoes are weak and short-lived with intensities that range between F0 and F1, although a very few tornadoes have reached F2 intensities. They occur less frequently compared to its neighboring countries such as China and Japan. Between 1998 and 2021, there are a total number of 156 documented tornadoes in the country. One of the earliest mentions of tornadoes that were documented in the country was in Anping, Tainan on June 3, 1877. However, the first tornado officially confirmed by the Central Weather Administration was in Tainan on April 18, 2007. Some tornadoes in the country originated as waterspouts before moving inland. Tornadoes in the country often occur during the summer monsoon months from April to October.
The word for 'tornado' in Taiwanese Hokkien is 卷螺仔风 (simplified) and 捲螺仔風 (traditional), which also refers to the word 'whirlwind.' It is a variation of the Mandarin Chinese word 龙卷风 (simplified) and 龍捲風 (traditional) which is lóng juǎn fēng in Pinyin, meaning "swirling-dragon wind," referring to the shape of a violently, rotating column of air.
A tornado is a powerful, rotating column of air that descends from the base of a thunderstorm onto the ground. It forms when warm, moist air collides with cold, dry air to create strong atmospheric instability, which then rotates due to vertical wind shear. Tornadoes often occur on intense thunderstorms or during tropical cyclones. Although tornadoes are short-lived, they can be destructive.

Taiwan has a humid subtropical climate in the north and a tropical monsoon climate in the south. During the rainy season or plum rain, the summer monsoon brings most of the accumulated annual rainfall in the country. It is also one of the most typhoon-prone areas in the world with an average of 3 to 4 typhoons hitting the country every year. One of the hazards of typhoons are tornadoes, which generally form on the right-front region of the storm system relative to its track. A notable example is a tornado in Tainan on August 9, 2015, where it formed on the outer bands of Typhoon Soudelor. While the probability of tornadoes hitting the country are rare, most of them occur in specific atmospheric environments. The geography of the country, particularly in the southern regions and the Chianan Plain are susceptible for tornadoes. Also known as the country's "tornado nest," areas such as Tainan, Kaohsiung, and Pingtung account for two-thirds of total documented tornadoes.

There are three specific environments for tornadoes to form: convection cells that form thunderstorms, the development of cumulus clouds that create a vertical column of vortices, or during typhoons. These environments provide the necessary conditions for tornadoes to occur in the country. Because tornadoes happen on a small scale, it is difficult for the country's meteorological agency to analyze such events. Most historical records of tornadoes came from news reports or through damage assessments but the prevalence of internet usage led to an increase in tornado reports, primarily through social media.
There are some notable tornadoes in Taiwan. On May 12, 2011, a rare anti-cyclonic F1 tornado formed in Xindian District, New Taipei City. It was also the first tornado ever observed in the northern region. Meanwhile, on April 6, 2013, the country's first multi-vortex tornado hit Dashu District, Kaohsiung and Wandan, Pingtung and was given an F2 rating by the Central Weather Administration.
2007 年 4 月 18 日凌晨於臺南安定、善化、新市及大內等地之龍捲風致災事件,則為歷年來持續時間最久(約 40 分鐘)且路徑最長(約 40 公里)之案例[The tornado that struck Tainan's Anding, Shanhua, Xinshi, and Danei areas in the early morning of April 18, 2007, was the longest-lasting (approximately 40 minutes) and longest-pathed (approximately 40 kilometers) tornado in recent years.]
光緒三年六月初三過午,有旋風起自安平,由南勢街越城入,向北呼嘯而過,當城內人們抬頭望只風行極速,閃爍如銀像龍。[The 3rd day of the 6th lunar month of the 3rd year of Guangxu, around noon, a whirlwind arose from Anping, crossed the city from Nanshi Street, and roared northward. When people in the city looked up, they saw the wind moving extremely fast, flashing like a silver dragon.]