was long-established in China for tropical cyclones of tropical storm intensity of above. Nowadays, the use of this system is restricted to coastal waters only. Thus, warnings may be discontinued even if a cyclone is maintaining tropical storm intensity inland. Color-coded alerts (below) may be in effect independently of any two-stage warnings. Later, China Meteorological Administration standardized the system for national use. This set is part of a larger warning system that covers other forms of severe weather conditions, such as extreme temperature, torrential rainfall, drought, etc. Guangdong Guangdong continued to set up the White typhoon alert for typhoon, indicating that tropical cyclones may affect the area within 48 hours. In some inland areas that are less affected by tropical cyclones (such as Qinghai, etc.), there is no typhoon warning signal, but when it is hit by tropical cyclones, a strong wind warning signal will be issued. The winds represented by each color are consistent with the typhoon warning signal. Typhoon warning signals used in Guangzhou from June 1, 1995, to November 1, 2000: Typhoon warning signals used from November 1, 2000, to May 2006: Typhoon warning signals used from June 1, 2006, to December 31, 2014: Typhoon warning signals used since January 1, 2015: Shenzhen Shenzhen currently uses a different signal from Guangdong Province: Zhuhai Zhuhai adopts the signal style of Guangdong Province, but the meaning of the signal is different: Ball signal Shenzhen and Zhuhai Shenzhen and Zhuhai used digitally arranged typhoon signals from June 4, 1994, to November 1, 2000, but they have now been replaced by typhoon warning signals. Ports The coastal ports of various cities in mainland China will still hang the squash signal when the typhoon hits. The sign is roughly the same as the typhoon signal used in Shenzhen and Zhuhai. Hong Kong and Macau The Pearl River Delta uses a variety of warning systems to inform the public regarding the risks of tropical cyclones to the area. The Hong Kong Observatory issues typhoon signals to indicate the existence and effects of a tropical cyclone on Hong Kong. The first numeric warning system was used in 1917. The Macao Meteorological and Geophysical Bureau in Macau uses a similar system. In Hong Kong the typhoon signal system consists of 8 signals in 5 levels numbered non-consecutively for historical reasons. Each signal has a day signal and a night signal for hoisting, which are still