Key facts
- Hong Kong Observatory issued its first black rainstorm warning of 2026 on Monday evening.
- The top-tier alert lasted for one hour.
- Flooding was reported in some areas due to heavy rainfall.
- The warning was subsequently downgraded to red and then amber.
- All rainstorm warnings were eventually cancelled.
The Hong Kong Observatory issued the first black rainstorm warning of 2026 on Monday evening, with the alert in effect for an hour. The top-tier warning came as a trough of low pressure was expected to bring further heavy rainfall in the subsequent 24 hours. Flooding was reported in some areas. The Observatory later downgraded the alert to a red warning and then to amber before eventually cancelling all rainstorm warnings.