Event Brief
Slow-moving storm system linked to record Chiba rain
By The BriefBrief · Sources (1)
Filed: Sep 11, 2026 at 4:10 AM ET
Summary: Researchers at Japan’s Meteorological Research Institute said a squall-line-type precipitation system lingered near the Boso Peninsula for more than six hours on Aug. 13, instead of moving quickly as such systems usually do. The unusual near-stationary storm contributed to record rainfall in Chiba that killed at least 13 people.
WHO: Meteorological Research Institute (Japan Meteorological Agency); Toru Adachi
WHAT: Preliminary analysis links Chiba’s record August rainfall to a squall-line system that remained nearly stationary for over six hours near the Boso Peninsula.
WHEN: Aug 13, 2026
WHERE: Boso Peninsula, Chiba Prefecture, Japan
WHY: A squall-line-type precipitation system lingered nearly stationary over Chiba, with its northern portion staying near the Boso Peninsula for more than six hours, producing intense downpours.
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