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🇹🇼 Taiwan /Environment & Climate

Taipei's Unexpected Midnight Thunderstorms Puzzle Experts

From Liberty Times · () Chinese

Translated from Chinese, summarized and contextualized by DistantNews.

At a glance

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  • Taipei experienced unexpected midnight thunderstorms, surprising residents who typically expect afternoon showers.
  • Experts suggest localized terrain and nighttime atmospheric cooling may have contributed to the late-night storm development.
  • Such midnight thunderstorms are rare, occurring less than 10 days a year in the region.

Residents in the greater Taipei area were taken by surprise when thunderstorms broke out late at night on July 16, transforming the expected afternoon showers into a midnight phenomenon. The unexpected downpour continued until the early hours of July 17, catching many off guard.

Last night, a convective system developed within the Taipei Basin in the evening and late night, turning afternoon thunderstorms into midnight thunderstorms.

— Wu ShengyuAnalyzing the cause of the unexpected late-night thunderstorms in Taipei.

Wu Shengyu, a senior consultant at WeatherRisk, explained that the convective system developed within the Taipei Basin during the evening and late night. While the rainfall was not exceptionally heavy, its timing was unexpected. He suggested that the convergence of local terrain-induced winds and the cooling of the upper atmosphere at night could have created the atmospheric instability necessary for the storm's development.

Wu noted that such occurrences, where thunderstorms form late at night or in the early morning under generally stable atmospheric conditions, are not entirely unprecedented but are relatively rare. His previous analyses indicated that these "midnight thunderstorms" happen fewer than 10 days a year. The small scale of these events often makes their precise causes difficult to pinpoint.

Such weak convective storm cells that appear in the evening or late at night may be related to the convergence of local terrain winds and the cooling of the upper atmosphere at night, causing atmospheric instability.

— Wu ShengyuExplaining potential meteorological factors behind the phenomenon.

WeatherRisk had previously pointed out that midnight thunderstorms are uncommon in the Taipei Basin. Sometimes, when afternoon thunderstorms fail to materialize or are less intense than predicted, the conditions might become favorable for storms to develop later in the evening or at night. This can be influenced by factors such as sea breezes during the day pushing moist air inland and the formation of land breezes at night, leading to convergence zones that can spawn thunderstorms.

Midnight thunderstorms occur less than 10 days a year in reality.

— Wu ShengyuHighlighting the rarity of the event.
DistantNews Editorial

Originally published by Liberty Times in Chinese. Translated, summarized, and contextualized by our editorial team with added local perspective. Read our editorial standards.

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