The Hong Kong Observatory jumped to issue No. 3 typhoon tropical cyclone to pass 400 kilometers southwest of Hong Kong

the weather

Written by: Golden Chess

2020-07-31 20:40

Today (31st) there were dark clouds in Hong Kong, and squally heavy rains were also felt in various districts at night. The Observatory issued the Strong Wind Signal No. 3 at 8:40 this evening. It is a rare case that the No. 1 typhoon signal is not issued first. The tropical cyclone is expected to move to Hainan Island, Beibu Gulf and the coast of Vietnam, passing 400 kilometers southwest of Hong Kong.

This tropical cyclone is different from the past. It was caused by the intensification of the "monsoon low pressure". The observatory issued a strong monsoon signal at 7:05 this morning, commonly known as the "black ball", which means that the general wind force in Hong Kong reaches the wind of No. 3 typhoon, which is 27 minutes apart. In the same year, the "Black Ball" was transferred to No. 3 Typhoon again.

The tropical cyclone affecting Hong Kong this time developed from a "monsoon depression". (Japan Meteorological Agency Sunflower 8 satellite)

Tomorrow offshore and highland wind will occasionally reach No. 8 typhoon wind

According to the nine-day weather forecast from the Observatory, tomorrow (August 1) will be cloudy with squally showers and a few thunderstorms. The rain is sometimes heavy; there will be large waves and swells on the sea. Winds from east to southeast are blowing from level 5 to 6, and at first offshore and on high ground up to level 8 occasionally. According to Beaufort's wind scale, the average wind speed of the 8th gale is 63 to 75 kilometers per hour, which is the wind force of the No. 8 gale or storm signal.

As of 7:20 this evening, the 10-minute average wind speeds at the four weather stations including Tap Mun, Tate's Cairn, and Cheung Chau are all higher than 41 kilometers per hour, which means that the wind speed of Typhoon No. 3 has been reached. In addition, at least seven weather stations have gusts higher than 63 kilometers per hour, reaching gale intensity, including the three Victoria Harbour weather stations at North Point, Central Ferry Pier and Star Ferry Pier.

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For the first time in 27 years, "Black Ball" directly transferred to Typhoon No. 3

This time, the Observatory skipped Typhoon Signal No. 1 and directly issued Typhoon Signal No. 3, which is extremely rare. Looking at the data, the last time a similar situation occurred was on June 18, 2000. At that time, a tropical depression formed in Hong Kong south of Lantau Island. The strong wind signal No. 3 lasted for 4.5 hours. The last time the strong monsoon signal (commonly known as the "black ball") was switched to typhoon signal No. 3, it was counted to September 25, 1993, when Typhoon Detti struck Hong Kong, and the observatory changed the issue of typhoon signal No. 8. .

▼Central Meteorological Observatory and Macao Meteorological Bureau forecast route▼

Ming Ming crossed Hainan Island to attack Hanoi, Vietnam

With reference to the European Center for Medium-Term Weather Forecast (ECMWF), the tropical cyclone is currently in the north-central South China Sea. Today, the central pressure is as low as 998 hPa, which can reach the intensity of a tropical storm. It is expected to move towards Hainan Island. After crossing Hainan Island on Saturday, the tropical cyclone will continue to move towards Vietnam. It will make landfall near Hanoi and dissipate next Monday (August 3).

As for the US Global Forecast System (GFS), it also predicts that the tropical cyclone will move to Hainan Island. It will cross the southwestern side of Hainan Island tomorrow and then move to Hanoi. It will be registered on Tuesday (August 4). The lowest central pressure of the material is 992 hPa, which can reach the intensity of a tropical storm.

▼ECMWF forecast▼

▼GFS forecast▼

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