Draft:Landslip Warning
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| Landslip Warning | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Icon of the Landslip Warning | |||||||||||||
| Traditional Chinese | 山泥傾瀉 警告 | ||||||||||||
| Simplified Chinese | 山泥倾泻 警告 | ||||||||||||
| |||||||||||||
Landslip Warning, is a warning issued by the Hong Kong Observatory (HKO) in conjunction with Geotechnical Engineering Office (GEO) when there is a high risk of many landslides as a result of persistent heavy rainfall.
The warning is meant to alert the public to take precautionary measures; aid engineers, contractors and others who are likely to suffer losses from landslides; and alert relevant government departments and organisations to take appropriate actions, such as opening of temporary shelters, search and rescue operations, closure of individual schools and relief work.[1] [2]
History
[edit ]In April 1977, the original two warning Amber and Red Landslip Warning introduced, however it was not public. In 1983, the warning was simplified into the current Landslip Warning and introduced to the public.[3] [4] [5]
In May 2024, the Special Landslip Advisory was introduced for situations when heavy rains persist in some areas but the risk of landslides in the majority of Hong Kong does not reach the Landslip Warning level, the GEO and the HKO will issue it to list out areas with a higher risk of landslides, to alert the public to the danger of landslides in those specific areas.[6] [7]
Landslide Potential Index
[edit ]The Landslide Potential Index (LPI), is derived by estimating the potential number of landslides based on rainfall intensity, rainfall location and spatial distribution of slopes in Hong Kong.[8]
The GEO will post the LPI of each intense rainstorm when the rainstorm ends (typically when the Landslip Warning is cancelled) to inform the public of its severity.[8]
| Landslide Potential Index | Description |
|---|---|
| > 100 | Extremely High |
| 51 - 100 | Very High |
| 10 - 50 | High |
| < 10 | Low |
Issuance of Strong Monsoon Signal since 2000
[edit ]Source:[9]
- Accurate as of 29 July 2026
| Time of Issuence | Time of Cancellation | Duration |
|---|---|---|
| 2000 | ||
| 03/04/2000 20:15 | 04/04/2000 02:15 | 6 hr |
| 14/04/2000 06:40 | 15/04/2000 05:50 | 23 hr 10 min |
| 23/04/2000 02:25 | 23/04/2000 10:40 | 8 hr 15 min |
| 02/05/2000 20:15 | 03/05/2000 06:30 | 10 hr 15 min |
| 18/06/2000 07:00 | 19/06/2000 06:30 | 23 hr 30 min |
| 24/08/2000 16:30 | 24/08/2000 23:30 | 7 hr |
| 2001 | ||
| 06/06/2001 06:00 | 06/06/2001 14:00 | 8 hr |
| 08/06/2001 07:45 | 08/06/2001 17:00 | 9 hr 15 min |
| 12/06/2001 14:15 | 12/06/2001 17:45 | 3 hr 30 min |
| 27/06/2001 15:45 | 28/06/2001 07:25 | 15 hr 40 min |
| 06/07/2001 18:00 | 07/07/2001 09:50 | 15 hr 50 min |
| 30/08/2001 15:30 | 30/08/2001 23:15 | 7 hr 45 min |
| 01/09/2001 22:45 | 02/09/2001 10:00 | 11 hr 15 min |
| 08/09/2001 03:30 | 08/09/2001 08:45 | 5 hr 15 min |
| 2002 | ||
| 10/08/2002 11:00 | 10/08/2002 15:00 | 4 hr |
| 15/09/2002 03:45 | 15/09/2002 20:30 | 16 hr 45 min |
| 17/09/2002 01:30 | 17/09/2002 12:45 | 11 hr 15 min |
| 2003 | ||
| 05/05/2003 07:30 | 06/05/2003 07:00 | 23 hr 30 min |
| 2004 | ||
| 17/07/2004 05:30 | 17/07/2004 11:00 | 5 hr 30 min |
| 29/08/2004 15:30 | 30/08/2004 06:15 | 14 hr 45 min |
| 2005 | ||
| 24/06/2005 10:15 | 25/06/2005 07:45 | 21 hr 30 min |
| 19/08/2005 21:00 | 22/08/2005 06:15 | 57 hr 15 min |
| 2006 | ||
| 03/05/2006 02:30 | 03/05/2006 13:00 | 10 hr 30 min |
| 02/06/2006 14:00 | 02/06/2006 22:15 | 8 hr 15 min |
| 09/06/2006 14:30 | 09/06/2006/ 17:20 | 2 hr 50 min |
| 13/09/2006 11:45 | 14/09/2006 04:15 | 16 hr 30 min |
| 2007 | ||
| 20/05/2007 09:00 | 20/05/2007 14:30 | 5 hr 30 min |
| 2008 | ||
| 19/04/2008 19:10 | 20/04/2008 02:20 | 7 hr 10 min |
| 07/06/2008 01:10 | 08/06/2008 12:00 | 34 hr 50 min |
| 13/06/2008 23:00 | 14/06/2008 18:45 | 19 hr 45 min |
| 25/06/2008 08:10 | 25/06/2008 21:45 | 13 hr 35 min |
| 10/07/2008 09:05 | 10/07/2008 17:25 | 8 hr 20 min |
| 2009 | ||
| 19/07/2009 03:00 | 19/07/2009 12:35 | 9 hr 35 min |
| 15/09/2009 18:00 | 16/09/2009 00:30 | 6 hr 30 min |
| 2010 | ||
| 22/07/2010 18:10 | 23/07/2010 04:35 | 10 hr 25 min |
| 28/07/2010 16:30 | 28/07/2010 21:30 | 5 hr |
| 21/09/2010 04:15 | 21/09/2010 09:00 | 4 hr 45 min |
| 2011 | ||
| None issued | ||
| 2012 | ||
| 24/07/2012 01:10 | 24/07/2012 15:00 | 13 hr 50 min |
| 2013 | ||
| 22/05/2013 05:10 | 22/05/2013 22:00 | 16 hr 50 min |
| 2014 | ||
| 30/03/2014 23:50 | 31/03/2014 05:00 | 5 hr 10 min |
| 31/03/2014 09:15 | 31/03/2014 15:30 | 6 hr 15 min |
| 09/05/2014 13:15 | 09/05/2014 23:40 | 10 hr 25 min |
| 11/05/2014 21:05 | 12/05/2014 06:50 | 9 hr 45 min |
| 13/08/2014 11:40 | 13/08/2014 22:40 | 11 hr |
| 2015 | ||
| 20/05/2015 21:45 | 21/05/2015 06:30 | 8 hr 45 min |
| 22/07/2015 10:45 | 22/07/2015 17:00 | 6 hr 15 min |
| 2016 | ||
| 02/08/2016 08:15 | 02/08/2016 12:40 | 4 hr 25 min |
| 19/10/2016 09:20 | 19/10/2016 22:00 | 12 hr 40 min |
| 2017 | ||
| 24/05/2017 11:15 | 24/05/2017 17:15 | 6 hr |
| 13/06/2017 08:55 | 13/06/2017 21:00 | 15 hr 5 min |
| 17/07/2017 21:00 | 19/07/2017 07:40 | 34 hr 40 min |
| 27/08/2017 16:10 | 27/08/2017 23:15 | 7 hr 5 min |
| 2018 | ||
| 07/06/2018 07:40 | 08/06/2018 15:50 | 32 hr 10 min |
| 29/08/2018 18:00 | 30/08/2018 18:00 | 24 hr |
| 16/09/2018 14:20 | 17/09/2018 11:20 | 21 hr |
| 2019 | ||
| 31/07/2019 20:40 | 02/08/2019 09:15 | 36 hr 35 min |
| 26/08/2019 02:50 | 26/08/2019 21:55 | 19 hr 5 min |
| 2020 | ||
| 06/06/2020 04:45 | 07/06/2020 17:00 | 36 hr 15 min |
| 19/08/2020 05:45 | 19/08/2020 15:45 | 10 hr |
| 2021 | ||
| 28/06/2021 11:10 | 28/06/2021 17:30 | 6 hr 20 min |
| 08/10/2021 09:50 | 10/10/2021 10:00 | 48 hr 10 min |
| 2022 | ||
| 12/05/2022 21:15 | 13/05/2022 15:15 | 18 hr |
| 2023 | ||
| 02/09/2023 05:50 | 02/09/2023 17:15 | 11 hr 25 min |
| 07/09/2023 23:45 | 11/09/2023 20:15 | 92 hr 30 min |
| 09/10/2023 02:00 | 10/10/2023 06:30 | 28 hr 30 min |
| 2024 | ||
| 04/05/2024 10:30 | 05/05/2024 06:15 | 19 hr 45 min |
| 2025 | ||
| 05/08/2025 02:15 | 06/08/2025 14:30 | 36 hr 15 min |
| 14/08/2025 14:00 | 15/08/2025 00:25 | 10 hr 25 min |
| 24/09/2025 09:15 | 25/09/2025 06:30 | 21 hr 15 min |
| 2026 | ||
| 18/06/2026 13:30 | 19/06/2026 09:00 | 19 hr 30 min |
Issuance and Effective Dates by year
[edit ]Source:[9]
- Accurate as of 29 July 2026
- Denotates most issued since 2000
| Year | Times Issued | Effective Dates |
|---|---|---|
| 2000 | 6 | 10 |
| 2001 | 8 | 11 |
| 2002 | 3 | 3 |
| 2003 | 1 | 2 |
| 2004 | 2 | 3 |
| 2005 | 2 | 6 |
| 2006 | 4 | 5 |
| 2007 | 1 | 1 |
| 2008 | 5 | 8 |
| 2009 | 2 | 3 |
| 2010 | 3 | 4 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 5 | 6 |
| 2015 | 2 | 3 |
| 2016 | 2 | 2 |
| 2017 | 4 | 6 |
| 2018 | 3 | 6 |
| 2019 | 2 | 4 |
| 2020 | 2 | 3 |
| 2021 | 2 | 4 |
| 2022 | 1 | 2 |
| 2023 | 3 | 8 |
| 2024 | 1 | 2 |
| 2025 | 3 | 6 |
| 2026 | 1 | 2 |
| Total[a] | 70 | 112 |
| Average[a] | 2.592 | 4.148 |
Notes
[edit ]References
[edit ]- ^ "Landslip Warning". hko.gov.hk. Retrieved 29 July 2026.
- ^ "Landslip Warning System". hkss.cedd.gov.hk. Retrieved 30 July 2026.
- ^ Pui-yin, Ho. Weathering The Storm (PDF). pp. 316 and 318.
- ^ "全港三十九處 居民二十五萬 修葺危險斜坡 明年全部完成 危險斜坡設雨量計隨時發出警告訊號 預防山坭傾瀉動用近五億元" (in Traditional Chinese). Wah Kiu Yat Po. 10 May 1983. p. 5. Retrieved 2 August 2026.
- ^ "土力工程處長白能達昨透露 預防山泥傾瀉措施 已花四億七千萬元 今後每年仍要維持在五千萬元" (in Traditional Chinese). Ta Kung Pao. 10 May 1983. p. 5. Retrieved 2 August 2026.
- ^ Landslip Warning System (PDF). August 2025. p. 2.
- ^ "土力工程處推「山泥傾瀉特別提示」 動態評估局部地區風險". CRHK (in Traditional Chinese). 27 May 2024. Archived from the original on 27 May 2024. Retrieved 2 August 2026.
- ^ a b "Landslide Potential Index". hkss.cedd.gov.hk. Retrieved 29 July 2026.
- ^ a b "Landslip Warning". hko.gov.hk. Retrieved 29 July 2026.