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1h ago

Developing Low to Trigger Severe Rain Across Northern to Western Japan Through Sept. 29

Warm, moist inflow along a frontal zone is combining with a developing low crossing Honshu to keep conditions unstable through Sept. 29.

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Overview

  • The Japan Meteorological Agency warns of very unstable conditions from Hokkaido to Kyushu with a risk of localized heavy rain through Monday.
  • Rain clouds have already intensified over southern Kyushu, with Akune in Kagoshima recording 51.5 millimeters in one hour early Sunday.
  • Forecasters expect a low to form on the front over the Sea of Japan and track across Honshu, spreading rain from west to east.
  • Authorities urge caution for inundation, landslides, and rising rivers, and also warn of lightning, tornado‑class gusts, and hail.
  • The Fukuoka District Meteorological Observatory projects up to 30 mm of rain in an hour and 50 mm in 24 hours across its area through Sunday evening.