The volcanic cloud arising from the eruption of the Chaiten volcano in Chile on May 2, 2008, at about 08:00 coordinated universal time was found by an analysis of Moderate Resolution Imaging Spectroradiometer Data (MODIS) to have impacted Hong Kong on June 6, 2008, after 35 days which is agreement with the e-folding time of sulphur dioxide.
At Tung Chung, the total precipitation for the day surpassed 400mm and the Former Chief Executive, Donald Tsang, described it as a "once in a century" event.
The Hong Kong Observatory eventually issued a Black rainstorm signal at 06:40 and it was sustained for 4 hours and 20 minutes.
A retaining wall at Old Coffee Bay, Castle Peak Road, Tuen Mun fell and collapsed on a store, killing two shoppers who were cousins on a visit from mainland China.
A section of Hung Hom Road collapsed at 13:00 on June 8 due to the previous day's heavy rainfall, causing detours.