What Are Autumn Typhoons? How Do They Differ from Summer Typhoons in Their Characteristics and Hazards?
TyphoonSays·防御问答 · The Typhoon Season · 更新 at 2026-10-24
What Are Autumn Typhoons?
Tropical cyclones that form or affect China from September to November are generally referred to as "autumn typhoons." Although they are meteorologically classified as tropical cyclones, just like summer typhoons, and are graded under the Chinese national standard Classification of Tropical Cyclones issued by the China Meteorological Administration (e.g., tropical storm, severe tropical storm, and typhoon), their occurrence during a particular season gives them characteristics that are distinctly different from those of summer typhoons. For those following the progress of the "first autumn typhoon of the year," understanding this concept can help assess risks more accurately and avoid becoming complacent based on past experience with summer typhoons.
Distinctive Characteristics of Autumn Typhoons
Compared with summer typhoons, autumn typhoons have three notable characteristics:
- They are often more intense: After being heated throughout the summer, the ocean usually retains high sea-surface temperatures in autumn, providing typhoons with ample energy. At the same time, the atmospheric environment is relatively stable in autumn, and vertical wind shear is sometimes reduced, which helps maintain and strengthen a typhoon's structure. The probability of super typhoons is therefore not low in autumn and may even exceed that in summer.
- Their tracks are more complex and variable: Autumn is a transitional period in atmospheric circulation, as the subtropical high shifts south and cold-air activity becomes more frequent. Typhoons are readily affected by multiple weather systems, including southward-moving cold air and westerly troughs. This can cause their tracks to make abrupt turns, stall, or loop, making them more difficult to forecast.
- They bring the combined impact of wind, rain, and cold air: This is the most distinctive hazard associated with autumn typhoons. They bring not only torrential rain and violent winds but also often combine with southward-moving cold air, producing a "1+1>2" effect. The convergence of cold and warm air masses can make rainfall longer-lasting and more widespread while bringing a sharp drop in temperature.
Major Hazards and Recommended Precautions
The hazards posed by autumn typhoons should not be underestimated. Residents should pay particular attention to the following:
- Persistent heavy rainfall can trigger secondary disasters: Because they may move slowly and have abundant moisture, autumn typhoons can produce localized extreme rainfall, leading to flash floods, landslides, debris flows, and urban waterlogging. Even when the typhoon's center is relatively far away, its outer cloud system may bring prolonged rainfall.
- Strong winds and sharp temperature drops may compound one another's effects: Violent winds can destroy crops and damage infrastructure, while the subsequent sharp temperature drop can pose a threat to human health. Elderly people and children in particular should take care to keep warm.
- Precautions:
- Closely monitor the latest warning signals issued by meteorological authorities.
- Check that doors and windows are properly secured and clear balconies of clutter.
- Avoid visiting hazardous areas such as coastal and mountainous regions while a typhoon is in progress.
- Specific arrangements for school closures and workplace suspensions may vary by location. Follow the guidance issued by local governments.
When facing an autumn typhoon, do not let your guard down simply because it occurs in autumn. Take precautions based on sound science, and put safety first. Real-time typhoon tracks 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.