Warning signal issued by the Hong Kong Observatory

1, overview of warning signals ① tropical cyclone warning

Starting from 1884, when a tropical cyclone approaches Hong Kong, the Hong Kong Observatory will issue a tropical cyclone warning signal to remind the public of the wind threat posed by tropical cyclones to public places in Hong Kong. At present, tropical cyclone warning signals are divided into five levels, namely 1, 3, 8 (northeast, northwest, southwest and southeast), 9 and 10.

② rainstorm warning system

The rainstorm warning signal in Hong Kong is a warning signal issued by the Hong Kong Observatory when there is a rainstorm in Hong Kong or it is predicted that there will be a rainstorm, so as to remind and warn the public. 1992 the hong kong observatory has set up a four-level rainstorm warning system, which is colored. 1998 rainstorm warning system was revised to yellow, red and black levels.

③ landslide warning

When the Hong Kong Observatory, with reference to the advice of the Geotechnical Engineering Office of the Civil Engineering and Development Department, thinks that continuous heavy rain may lead to landslides, it will issue a landslip warning. This early warning is mainly aimed at landslides with wide influence and a large number.

④ Special Report on Flooding in Northern New Territories

Whenever flooding occurs or is expected to occur in low-lying areas in northern New Territories, the Observatory will issue a special report on flooding in northern New Territories.

⑤ Thunderstorm warning

Thunderstorm warnings will be issued by the Observatory whether the thunderstorm affects a wide area or only involves a certain area in Hong Kong. Outdoor stadiums, gymnasiums and swimming pools in Hong Kong are customarily closed to avoid accidents. Thunderstorm warning is the most frequent warning signal in a year, and it may even be issued many times a day in rainy season.

⑥ Strong monsoon signal

A strong monsoon signal is issued, indicating that the average wind speed of monsoon in winter or summer is or will exceed 40 kilometers per hour anywhere near the sea level in Hong Kong. Winter winds usually blow from the north or the east, while summer monsoon is mainly southwest wind. In a very open place, the wind speed of the monsoon can exceed 70 kilometers per hour.

Hong kong observatory

⑦ Early warning of hot and cold weather

1999 to 65438+February, when it is predicted that the minimum temperature in the urban area will drop to 12.0 degrees Celsius or below, the Hong Kong Observatory will issue a cold weather warning; In addition, a very hot weather warning was set up in 2000, and this warning will be issued when it is predicted that the maximum temperature in urban areas will rise to 33.0 degrees Celsius or above. 8 frost warning

Winter in Hong Kong is very cold. When the dew point drops to near or below zero degrees Celsius and the wind is weak, frost may appear in the mountainous areas and inland areas of the New Territories. When there are signs that frost will appear in the mountainous areas of Hong Kong or inland areas of the New Territories, the Observatory will issue a frost warning to remind farmers of the impact of frost on crops.

Pet-name ruby fire danger warning

The Hong Kong Observatory will issue fire danger warnings based on factors conducive to the occurrence and spread of fires, such as low humidity and high wind speed, and the information provided by the Agriculture, Fisheries and Conservation Department on the drying of plants. There are two kinds of warnings: yellow and red. Yellow fire warning means high fire risk, and red fire warning means extremely high fire risk.

Participate in tsunami warning

Tsunami warning indicates that a strong earthquake is expected to produce or has produced a tsunami. If the tsunami continues, it will reach Hong Kong within 3 hours, and the height of the tsunami may exceed the normal tide level by 0.5 meters. Tsunami warning never needs to be issued, but at noon on April 3, 2007, the Observatory mistakenly pointed out in the "Hourly Temperature and Humidity Report" that the tsunami warning was taking effect due to human error.

After the South Asian tsunami in June, 5438+February, 2004, when there was a tsunami threat in the Pacific Ocean or the South China Sea, the Observatory would issue a "tsunami report", but it is not expected to seriously affect Hong Kong. On the evening of February 26th, 2006, a strong earthquake struck Taiwan Province Province, and the Observatory issued the tsunami report for the first time.