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The red and black signals were the second stage of the warning system based on actual rainfall levels recorded, and were issued to the public. Amber: More than 50 mm of rain is expected in the Hong Kong region within six hours. Red: Rainstorm has started and more than 50 mm of rain has been recorded over a wide area within the last hour or less ...
Hong Kong Observatory (HKO) issued a flood warning for Northern New Territories at 7:50 pm. [7] Heavy rainfall then spread to the entire territory, forcing the HKO to issue the Amber rainstorm signal, and later the Red signal in less than half an hour. At 11:05 pm, the highest warning level, Black rainstorm signal, was issued due to worsening ...
In US maritime warning flag systems, a red square flag with a black square taking up the middle ninth of the flag is used to indicate a storm warning (the use of two such flags denotes a hurricane force wind warning or a hurricane warning). The same flag as a storm warning is used to indicate a tropical storm warning.
The extreme conditions caught many residents by surprise and came just days after Hong Kong was lashed by its strongest typhoon in five years.
It was the first time the warning was issued in two years. [16] It caused three fatalities. The torrential rainfall continued overnight and into the morning of 8 September, gradually subsiding by afternoon. The Black Rainstorm signal lasted over 16 hours, the longest duration ever since the rainstorm warning system was implemented in 1992.
The Hong Kong Observatory generates short term rainstorm warnings for systems which are expected to accumulate a certain amount of rainfall per hour over the next few hours. They use three levels of warning. The amber warning indicates that a rainfall intensity of 30 millimetres (1.2 in) per hour is expected.
An Amber rainstorm signal was issued at 05:15, and it escalated to Red at 05:55. 112mm, 101mm, and 86mm of rain were recorded at the Eastern, Southern, and Sai Kung Districts respectively. The Hong Kong Observatory eventually issued a Black rainstorm signal at 06:40 and it was sustained for 4 hours and 20 minutes.
Black rainstorm signal, the third level of Hong Kong rainstorm warning signals; Schwarzer Regen (lit. Black Rain), a fictional exoskeleton in the Japanese light novel series Infinite Stratos; Black Reign (disambiguation) Dark Rain, The Outer Limits (1995 TV series) episode