Primary factors behind the Heavy Rain Event of July 2018 and the subsequent heat wave in Japan

Akihiko Shimpo, Kazuto Takemura, Shunya Wakamatsu, Hiroki Togawa, Yasushi Mochizuki, Motoaki Takekawa, Shotaro Tanaka, Kazuya Yamashita, Shuhei Maeda, Ryuta Kurora, Hirokazu Murai, Naoko Kitabatake, Hiroshige Tsuguti, Hitoshi Mukougawa, Toshiki Iwasaki, Ryuichi Kawamura, Masahide Kimoto, Izuru Takayabu, Yukari N. Takayabu, Youichi TanimotoToshihiko Hirooka, Yukio Masumoto, Masahiro Watanabe, Kazuhisa Tsuboki, Hisashi Nakamura

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

An extreme rainfall event occurred over western Japan and the adjacent Tokai region mainly in early July, named "the Heavy Rain Event of July 2018", which caused widespread havoc. It was followed by heat wave that persisted in many regions over Japan in setting the highest temperature on record since 1946 over eastern Japan as the July and summertime means. The rain event was attributable to two extremely moist airflows of tropical origins confluent persistently into western Japan and largescale ascent along the stationary Baiu front. The heat wave was attributable to the enhanced surface North Pacific Subtropical High and upper-tropospheric Tibetan High, with a prominent barotropic anticyclonic anomaly around the Korean Peninsula. The consecutive occurrence of these extreme events was related to persistent meandering of the upper-level subtropical jet, indicating remote influence from the upstream. The heat wave can also be influenced by enhanced summertime convective activity around the Philippines and possibly by extremely anomalous warmth over the Northern Hemisphere midlatitude in July 2018. The global warming can also influence not only the heat wave but also the rain event, consistent with a long-term increasing trend in intensity of extreme precipitation observed over Japan.

Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalScientific Online Letters on the Atmosphere
Volume15
Issue numberA
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Atmospheric Science

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