The Japan Meteorological Agency issued warnings for heavy rain, thunder, and gusts across wide areas of Japan for May 1, 2024 [4].
These weather conditions pose a significant risk to public safety and infrastructure, particularly in the Kanto region where rainfall is expected to peak during the morning hours [2].
Forecasters said the instability is caused by two [1] low-pressure systems that are developing and moving through the region. This movement, combined with cold air in the upper atmosphere, has created a volatile environment prone to severe weather [1, 5].
The agency said the Kanto region may experience heavy rain, thunderstorms, gusts, hail, and tornadoes [2, 3]. These threats extend across a vast geography, stretching from western to eastern Japan, and including the entire Pacific side of Tohoku and eastern Japan [2, 3].
Temperatures are expected to drop significantly during this period. In Matsue, the forecast high is 14 degrees Celsius [1]. Forecasters said some areas across western and eastern Japan will see maximum temperatures fail to reach 20 degrees Celsius [1].
On April 30, 2024, the Japan Meteorological Agency called for caution regarding lightning strikes, gusts, and hail [4]. The agency said the atmospheric state would remain very unstable through May 1, 2024 [4].
TBS NEWS DIG said that while some sunny intervals may appear across western and eastern Japan, residents should remain vigilant against sudden thunderstorms [2].
“The Kanto region may experience heavy rain, thunderstorms, gusts, hail, and tornadoes.”
The convergence of multiple low-pressure systems with upper-level cold air creates a high-energy environment that often leads to rapid-onset severe weather. When these patterns intersect over densely populated areas like Kanto, the risk of urban flooding and transport disruptions increases, necessitating the broad warnings issued by the agency.
