How Severe Is Hong Kong's No. 10 Signal? How Many Times Has It Been Issued in History?
TyphoonSays·防御问答 · Early warning signals · 更新 at 2026-09-30
No. 10 Signal: Extreme Danger from Direct Hurricane Impact
The No. 10 Hurricane Signal is the highest level in Hong Kong's tropical cyclone warning system, representing an extremely critical state. When this signal is in effect, it means the center of the typhoon is passing very close to or directly over Hong Kong. During this time, most parts of Hong Kong will experience sustained hurricane-force winds, with mean wind speeds reaching 118 km/h or higher, and gusts potentially far exceeding this value.
Such winds possess devastating destructive power: roofs of low-rise buildings may be torn off, trees uprooted, and unsecured outdoor objects turned into deadly "flying projectiles." This is not merely strong wind weather; it is an emergency moment requiring immediate implementation of the highest level of protective measures. All non-essential outdoor activities must cease immediately, and those outdoors must quickly seek shelter in sturdy structures.
Historical Frequency and Recent Cases
Although the No. 10 Signal strikes fear into many, its actual occurrence frequency is extremely low. Since the establishment of the modern tropical cyclone warning system in 1946, up to early 2024, the No. 10 Signal has been issued only about 17 times in Hong Kong's history. This data indicates that it occurs on average only once every few years or even longer.
Well-known recent cases include Super Typhoon Mangkhut in 2018 and Super Typhoon Saola in September 2023. Mangkhut caused widespread infrastructure damage and prolonged disruption to social operations; Saola lingered near the Pearl River Estuary, posing a severe threat to Hong Kong. These cases remind us that although the No. 10 Signal is rare, when issued, it is often accompanied by super typhoons with extreme destructive power. The public should not let their guard down due to luck; every warning must be taken seriously.
Home Shelter and Action Guidelines
When the No. 10 Signal is in effect, social operations usually enter a "standstill" mode. Most schools suspend classes, and the majority of businesses stop work (specific arrangements depend on announcements from local authorities and employers). Citizens should follow these core safety principles:
- Secure and Stay Away: Close and lock all windows and doors tightly, checking the stability of window frames. Do not stand near windward windows to observe the storm, as broken glass can cause injury. If possible, clear balconies of potted plants and other items that could fall in advance.
- Supply Reserve: Ensure your home has at least three days' worth of drinking water, non-perishable food, common medications, flashlights, and spare batteries to cope with potential power and water outages.
- Strictly No Going Out: Unless facing a life-threatening emergency, absolutely do not go outside. Be particularly wary of the brief calm when the "eye of the storm" passes; this is highly deceptive, as fierce winds may strike again from the opposite direction, often with greater intensity.
- Stay Informed: Remain calm and obtain the latest meteorological information through official channels. Do not believe or spread rumors.
In the face of extreme weather, scientific prevention is key to protecting life and property. Real-time typhoon tracks can be queried at TyphoonSays (taifengshuo.com)
This article is original educational content from TyphoonSays. Please refer to the latest official announcements from local governments for policy standards.