Champi glanced Taiwan, turned around, and came back for more

Most typhoons pass a place once. Champi passed Taiwan, changed its mind, and came back. The storm, at one point a super typhoon and one of the strongest in the Pacific this year, glanced the island's northeast coast in the early hours of Saturday, turned south around midnight hugging the Yilan coastline, looped offshore in a manoeuvre forecasters rarely get to describe, and moved north again for a second brush. By Saturday the count from Taiwan's fire department stood at one dead, a man swept away by waves on Liuqiu island, and 527 injured in the wind and rain.

The numbers sketch what a glancing blow from a storm of this size means. Gusts reached about 227 kilometres an hour in some coastal areas, tearing down trees and power lines and sending roof tiles flying. Taipower said more than 288,000 homes lost electricity at the peak, though most were reconnected as the storm weakened. Almost 1,000 flights were cancelled on Friday, easing to 242 on Saturday, and a swathe of northern and central Taiwan, Taipei included, declared a second day of school and office closures. In Yilan, a retired teacher surnamed Lin, inspecting flattened banana trees in his garden, told Reuters it was most terrifying around midnight, a sleepless night unlike anything in many years.

Taiwan's low death toll is not luck, and it is worth saying why in the middle of the damage figures. The island is hit by typhoons most years and builds, drills and communicates accordingly: closures are declared early, flights stop before the wind arrives rather than after, and the public treats the warnings as instructions rather than content. A storm that injures 527 people is a serious event. A storm of this strength producing a death toll of one, in a densely populated island in its path, is what preparation looks like when it works.

The storm is not finished with the region. Champi is weakening, with gusts near its centre down to about 126 kilometres an hour on the Central Weather Administration reading, and its track now runs north up the Chinese coast toward southern Japan. China's emergency management ministry sent a team to Zhejiang province, readying 400 rescue workers, 600 pieces of equipment and more than 41,000 firefighters on emergency duty, while in Taizhou more than 3,800 fishing boats returned to harbour, offshore fish farm workers were brought ashore, about 2,084 island visitors were evacuated and ferry routes and offshore construction were suspended.

Our call is that Champi's loop is the detail scientists will keep, long after the flight counts fade. Storms that stall, turn and revisit a coastline break the assumptions built into warnings, insurance and drainage alike, because every system is designed around a single pass with a beginning and an end. Taiwan coped with a double pass this time, in late October, outside the classic summer season, which is the other quiet signal in this story. Coasts that prepare for one visit, in one season, are planning for the climate that raised them. Champi just demonstrated, politely by its standards and at the cost of one life, what the revised invitation looks like.