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Signal No. Meaning TCWS #1 winds of 30–60 km/h (19–37 mph; 16–32 kn) are prevailing or expected to occur within 36 hours: TCWS #2 winds of 61–120 km/h (38–74 mph; 33–64 kn) are prevailing or expected to occur within 24 hours: TCWS #3 winds of 121–170 km/h (75–105 mph; 65–91 kn) are prevailing or expected to occur within 18 ...
The NCHMF tracks a storm should it enter the agency's monitoring area range which is within the East Sea to the west of 120°E and north of 5°N. Any storm that enters this area is assigned a number, and is set according to its sequence of its occurrence – as for instance with Bão số 1 etc., which translates to "Storm no. 1".
That night, the Hong Kong Observatory issued the Standby Signal No. 1 when Mangkhut was 1,110 kilometres (600 nmi) away from Hong Kong, the farthest distance on record. [31] On September 15, citizens living in Tai O and Lei Yue Mun were evacuated from these low-lying areas that have historically been very prone to storm surge. [32]
Typhoon warning signal No. 1 shown at the Mid-Level escalators Typhoon warning Signal No. 3 shown at Hong Kong station. This warning was likely issued for Tropical Storm Talim (2012). In accordance with legal codes and customs in Hong Kong, once any signal higher than No. 3 is issued, all government agencies shut down their operations.
Ahead of the storm, PAGASA has issued Tropical Cyclone Wind Signal No. 1 for the eastern part of Cagayan, including the islands of Babuyan and Camiguin, as well as the eastern portion of Isabela. [64] The agency also began raising Signal No. 2 warnings in parts of Northern Luzon. [65]
PAGASA warned of heavy rains, strong winds, and storm surges affecting northern Luzon. [38] On the evening of November 4, PAGASA issued Tropical Cyclone Wind Signal No. 1 for Batanes, the northern and eastern portions of Cagayan including the Babuyan Islands, the eastern portion of Isabela, and the northern portion of Ilocos Norte. [39]
Therefore, on July 22, the PAGASA issued a Signal No. 1 wind warning in parts of the Babuyan Islands, Batanes, Cagayan, and Isabela. The PAGASA expected winds of up to 61 km/h (69 mph) in these provinces. [27] On the morning of July 23, PAGASA raised to Signal No. 2 warning in Batanes as Gaemi's outer rainbands began to affect the province. [28]
TCWS #1 winds of 39–61 km/h (21–33 kn; 24–38 mph) are prevailing or expected to occur within 36 hours: TCWS #2 winds of 62–88 km/h (33–48 kn; 39–55 mph) are prevailing or expected to occur within 24 hours