Rio Grande do Sul — the danger window is Sep 19

EMERGING · September 18, 2026 · NO. 0918

THE RISK WINDOW

A dated southern storm window, one day out. Rio Grande do Sul carries a danger-storm window on Sep 19 with winds to 100 km/h, after Thursday's yellow storm warning across Rio de Janeiro and nine further cities and an orange for Passo Fundo at 100 mm and hail.

THE RECORD

6 turning points on record since Sep 8.

Sep 17▽ slipped down the board

Sep 15easing → active · became confirmed

Sep 13▽ slipped down the board

Sep 12↑ moved up the board

Sep 11active → easing · eased sharply

Sep 8appeared, active

WHO IT TOUCHES

Events and venuesa national holiday weekend inside a large storm's rain shield, and outdoor crowds under record-challenging heat at the other end of the board

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