Vietnam — Hanoi flooded overnight, and then the axis moved south

ACTIVE · September 17, 2026 · NO. 0917

THE WATER

Hanoi flooded overnight on more than 150 mm, and the heavy-rain focus has shifted south: Ho Chi Minh City and southern Vietnam brace for a five-day spell from today, driven by a trough interacting with cold air, with no named tropical cyclone in it. High population exposure and far less desk attention than Japan or the speculative Mediterranean story. (Handled with care.)

THE RECORD

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

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

Aug 27active → building

WHO IT TOUCHES

Public safetynine national warning systems live at once, three fatalities already counted, and exactly one hazard with a published start time

Supply chainsa holiday rail and port weekend in Japan, a dated release on an African waterway, and a river still too low to load

Healthfloodwater reaching dense settlement on four continents, three deaths already, and a heat tier that reaches outdoor workers

Agricultureharvest and livestock decisions on five continents, and one of them can be read off a published schedule

CONNECTED

In both of these the storm is the smaller half of the problem — Dujuan's ordinary rain is dangerous because Kantō-Kōshin has taken about 365 percent of normal since Sep 1, and southern Vietnam's five-day spell starts on a region whose northern half flooded overnight.

South-east Asia's real flood front runs through the two stories nobody is telling — a Palawan low inside the convergence zone puts flash-flood and landslide risk across the Visayas and Mindanao on the same morning Ho Chi Minh City begins a five-day spell, with high population exposure on both and almost no English-language discourse on either.