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2018 Northeast Asia heat wave

Heat wave affecting Japan, Korea and China

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Through Heat wave, Japan and South Korea

Synopsis

Following flooding and mudslides that lasted from late June through mid-July 2018, an extensive heat wave spread across the Japanese mainland. In the prefectures that had been hit the worst by floods and landslides, Hiroshima, Okayama, and Ehime, 145 people were hospitalized with heat stroke symptoms as temperatures there rose above 35 °C (95.0 °F). On 15 July, 200 out of 927 stations in the nationwide observation network recorded maximum temperatures exceeding 35 °C (95.0 °F). On 23 July, a high temperature of 40.8 °C (105.4 °F) was observed in Kumagaya, 65 km (40 mi) northwest of Tokyo. This constitutes an all-time high for all of Japan. Many cities recorded temperatures near 40 °C (104 °F) on this day. In Kyoto, temperatures stood above 38 °C (100 °F) for seven days in a row for the first time since records began to be kept in the 19th century.

By 24 July, the Japan Meteorological Agency (JMA) called the event a natural disaster and indicated many areas were observing "unprecedented levels of heat". A study depicted the three‐phase lifecycle of the East Asian summer monsoon and the corresponding timing of the 2018 consecutive extreme events (indicated in the bottom). The sequential yet contrasting extreme events in Japan therefore reflect an amplified monsoon lifecycle projected in a warmer climate.(ASL study 2019)

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