ThreadlineTimeline
All timelines

Recorded event

Recorded event

Heavy rainfall begins in Chiba

The August 13-14 episode brought exceptional rainfall to Chiba, with some locations exceeding 300 mm over the period.

Read context

The date marks the start of a two-day event. It is not the later report's publication date.

Sources

Read the evidence behind this timeline.

Source descriptions are written by Threadline

Japan Meteorological AgencyPrimary record

Meteorological case record for August 13-14

jma.go.jp

Documents the milestone and distinguishes the event date from the report date.

Published: 9/16/2026
Source checked: 9/20/2026

Revision 1 / Reviewed 9/20/2026

Connected timelines

Chiba rainfall: the storm and the later report