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water

Southern Vietnam — the five-day spell began today

ACTIVE · September 18, 2026 · NO. 0918
THE WATER

The most consequential water on the board that almost nobody outside the region is covering. The southern spell runs Sep 18–24 with 150 to 300 mm and locally more than 300 mm, and 10 to 20 cm of flooding expected in Ho Chi Minh City, where pumps have been reinforced — driven by a southward-pushing cold-air mass, not by any named cyclone. It begins while the north, including Hanoi, is still draining submerged homes. (Handled with care.)

THE RECORD

13 turning points on record since Aug 21 — the 8 most recent shown.

Sep 17▽ eased
Sep 16peak → active
Sep 15easing → peak · intensified sharply
Sep 13▽ slipped down the board
Sep 12▽ eased
Sep 11active → easing
Sep 8building → active
Aug 28▽ became confirmed
WHO IT TOUCHES
Public safetynine national warning systems live at once, one with danger-to-life wording, one with a published clock, and the biggest one still entirely ahead
Supply chainsa holiday rail and port weekend in Japan, a dated release on an African waterway, a flooding logistics region in Vietnam, and a river that is still too low to load
Healthfloodwater reaching dense settlement on four continents, two ledgers at different vintages, and a heat tier that reaches outdoor workers
Agricultureharvest and livestock decisions on five continents, a monsoon that means opposite things at each end of one country, and one release a grower can read off a timetable
CONNECTED

In both of these the storm is the smaller half of the problem — Dujuan's ordinary rain is dangerous because Kanto-Koshin is reported at about 365 percent of normal since Sep 1, and southern Vietnam's five-day spell opens on a country whose northern half is still draining submerged homes.

South-east Asia's real flood front runs through the two stories with the least coverage per person exposed — a Palawan low holding flash-flood and landslide risk across the Visayas and Mindanao for a third morning, and a five-day spell opening today on Ho Chi Minh City.