A Guide to Hong Kong’s Typhoon and Rainstorm Warning Signals
Hong Kong experiences tropical cyclones (typhoons) and heavy rainstorms, particularly between May and November. The Hong Kong Observatory (HKO) has a well-established warning system to alert the public about severe weather.
Typhoon Warning Signals
Typhoons (or tropical cyclones) are classified based on their intensity and potential impact. The HKO uses a numbered signal system to inform the public:
1️⃣ Standby Signal No. 1
🌀 Meaning: A tropical cyclone is within 800 km of Hong Kong but does not pose an immediate threat.
✅ Actions:
Stay updated on weather reports.
No major impact on daily activities.
3️⃣ Strong Wind Signal No. 3
🌀 Meaning: Strong winds (41-62 km/h) are expected, with gusts possibly exceeding 110 km/h.
✅ Actions:
Secure loose objects (plants, outdoor furniture, etc.).
Small boats should return to port.
Schools may close for safety reasons.
Business and public transport continue as usual, but caution is advised.
8️⃣ Gale or Storm Signal No. 8
🌀 Meaning: Gale-force winds (63-117 km/h) expected.
✅ Actions:
Businesses and schools close (except emergency services).
Public transport shuts down gradually—MTR, buses, and ferries stop running.
People should stay indoors and avoid non-essential travel.
If Signal No. 8 is issued during working hours, employees are usually sent home.
⚠️ Types of Signal No. 8:
Northeast Gale or Storm Signal No. 8 – Strongest winds from the northeast.
Southeast Gale or Storm Signal No. 8 – Strongest winds from the southeast.
Southwest Gale or Storm Signal No. 8 – Strongest winds from the southwest.
Northwest Gale or Storm Signal No. 8 – Strongest winds from the northwest.
9️⃣ Increasing Gale or Storm Signal No. 9
🌀 Meaning: Winds are strengthening rapidly, exceeding 117 km/h.
✅ Actions:
Remain indoors and avoid windows.
Expect widespread transport disruption.
Flights and ferry services may be canceled.
🔟 Hurricane Signal No. 10
🌀 Meaning: A super typhoon is hitting Hong Kong, with winds over 118 km/h, possibly reaching 200 km/h.
✅ Actions:
Do not go outside! Stay in a safe, enclosed space.
Expect power outages, flooding, and serious damage.
Emergency services may be delayed due to hazardous conditions.
Stay tuned to official updates.
Rainstorm Warning Signals
Heavy rain can lead to flooding and landslides in Hong Kong. The HKO uses a three-tier Rainstorm Warning System:
Amber Rainstorm Warning 🟡
🌧 Meaning: Rainfall exceeds 30 mm per hour and may continue.
✅ Actions:
Stay updated, but daily activities continue as normal.
Be cautious of slippery roads and possible flooding in low-lying areas.
Red Rainstorm Warning 🔴
🌧 Meaning: Rainfall exceeds 50 mm per hour and is expected to continue.
✅ Actions:
Schools close immediately, and students stay in safe places.
Public transport may be delayed, but continues operating.
Avoid outdoor activities.
Black Rainstorm Warning ⚫
🌧 Meaning: Extremely heavy rain (exceeding 70 mm per hour) is causing widespread flooding.
✅ Actions:
Do not go outside! Stay indoors until the warning is lifted.
Businesses and schools remain closed.
Public transport shuts down or operates on a limited basis.
Landslides and flash floods are possible—avoid hilly areas and underpasses.
Safety Tips During Typhoons & Rainstorms
✔️ Before a Typhoon or Heavy Rain:
Stock up on food, water, batteries, and emergency supplies.
Secure windows, balconies, and outdoor objects.
Charge your phone and power bank.
✔️ During a Typhoon or Rainstorm:
Stay indoors and away from windows.
Avoid flooded areas—strong currents can sweep you away.
Do not attempt to drive or use public transport during black rain or Signal No. 8+.
✔️ After the Storm:
Be cautious of fallen trees, broken glass, and landslides.
Check public transport updates before heading out.
Beware of unstable structures and stay alert for aftereffects.
Final Recommendations
Hong Kong’s typhoon and rainstorm warning systems are highly reliable. By staying informed and following safety protocols, you can stay safe during extreme weather events. Always check the Hong Kong Observatory website or mobile app for real-time updates.
