Is Zhoushan Vulnerable to Direct Typhoon Strikes? How High Is the Risk?
TyphoonSays·防御问答 · City Typhon · 更新 at 2026-10-24
The Zhoushan archipelago is located along China's eastern coast, south of the Yangtze River estuary. Its unique geographical position makes it a frequently affected area when typhoons occur. Whether it is “vulnerable to direct strikes” and how high its “risk level” is cannot be determined simply by looking at whether a typhoon's center makes landfall. Instead, its proximity to the storm's path and the compounding effects of multiple hazards must be considered together.
Geographic Disadvantages and the Reality of “Frequent, High-Risk” Impacts
Zhoushan consists of more than 1,390 islands. Surrounded by the sea on all sides, it lacks the protective buffer provided by inland terrain. This open geography allows typhoon airflow from the Pacific to penetrate inland with little obstruction. Although historical statistics show that the probability of a typhoon's center passing precisely over Zhoushan's main island each year is far from 100%, the probability that Zhoushan is covered by the storm's outer spiral rainbands or its seven-level wind circle is extremely high.
More importantly, island terrain readily produces a “narrow-tube effect” and “orographic uplift,” meaning actual wind speeds are often higher than the average values in meteorological forecasts. In the past, strong typhoons such as “MUIFA,” “CHAN-HOM,” and “IN-FA” caused destructive winds and extreme rainfall in Zhoushan even without making direct landfall, owing to their close proximity, slow movement, and abundant moisture. Residents therefore face not only the risk of a “direct strike,” but also the recurring risk of “high-intensity impacts.” They should abandon the false sense of security that “if it does not make landfall, we are safe.”
Three Major Hazard Chains: Wind, Waves, and Water
Typhoons pose three-dimensional, compounding threats to Zhoushan, primarily in the following areas:
- Extreme winds: Because of low friction over the sea and the influence of island terrain, gusts in Zhoushan often exceed those experienced inland from typhoons of the same intensity. Winds above Force 12 can destroy outdoor facilities and may also threaten the glass curtain walls of high-rise buildings.
- Storm surge combined with astronomical high tides: This is the deadliest hazard for coastal areas. When a typhoon's low pressure draws seawater upward and creates a storm surge, its effects can coincide with astronomical high tides around the first and fifteenth days of the lunar calendar. The combination can easily cause seawater to inundate low-lying communities, docks, and coastal roads, resulting in damage far greater than that caused by rainfall alone.
- Secondary geological disasters: Although the mountains in Zhoushan are not particularly high, the rock and soil on some islands are loosely structured. Short-duration, intense rainfall can easily trigger landslides and debris flows. At the same time, urban drainage systems may fail when intense rain coincides with high water levels that impede outflow, leading to severe waterlogging.
Precise Defenses and Action Guide
When facing high risks, a scientific response is essential. closely monitor the warning signals issued by meteorological authorities (blue, yellow, orange, and red); the darker the warning color, the greater the danger.
- Strengthen your home: Before a typhoon arrives, be sure to remove flowerpots and other objects from balconies and check that doors and windows are properly sealed and secured. Residents of low-lying areas, dilapidated buildings, or properties along the first row of the waterfront should prepare flood-control supplies such as sandbags in advance and familiarize themselves with evacuation routes.
- Avoid hazardous areas strictly: While warnings are in effect, going out to sea for fishing or angling, or visiting the coast to watch the tides or take photographs, is strictly prohibited. Personnel engaged in maritime operations must return to port and take shelter in accordance with regulations.
- Follow government directives: When an orange or red warning is issued, local authorities typically activate school closures, work stoppages, and transportation suspensions. Specific standards and implementation measures vary by locality, so be sure to follow the latest notices issued by local governments and emergency management departments.
Typhoon preparedness is a race against time. Only by respecting the danger and preparing in advance can we turn a crisis into safety. Real-time typhoon tracks and the latest forecasts are available on TyphoonSays (taifengshuo.com).
This article is original educational content from TyphoonSays. Please refer to the latest official announcements from local governments for policy standards.