What does tropical storm mean?

Tropical storm is a tropical cyclone that occurs in the tropical ocean. According to international standards, when the maximum wind force near the center of a tropical cyclone is less than 8, it is called a tropical depression; winds of 8 and 9 are called tropical storms; winds of 10 and1are called strong tropical storms; only tropical cyclones with the maximum wind force of 12 near the center are called typhoons.

What does the tropical storm mean in the weather forecast?

Tropical storm is a kind of tropical cyclone, and the continuous wind force near its center is 63-87 kilometers per hour, that is, the wind force of strong wind level. It is the most destructive of all natural disasters. Every year, hurricanes sweep inland from the ocean, leaving only a mess after strong winds and storms. Tropical storm is a kind of typhoon, which refers to a tropical cyclone with a maximum wind force of 8-9 (17.5-24.2 m/s).

What's the difference between a tropical storm and a typhoon?

Tropical depression: wind speed 13.9 m/s to 17. 1 m/s, and the maximum wind force near the center is 7;

Tropical storm: wind speed 17.2 m/s to 24.4 m/s, and the maximum wind force near the center is 8 to 9;

Severe tropical storm: the wind speed is 24.5m/s to 32.6m/s, and the maximum wind force near the center is 10 to1;

Typhoon: the wind speed is 32.7m/s to 41.4m/s, and the maximum wind force near the center is 12 to13;

Strong typhoon: the wind speed is 4 1.5 m/s to 50.9 m/s, and the maximum wind force near the center is 14 to15;

Super typhoon: the wind speed is greater than or equal to 5 1.0m/s, and the wind force is more than 16.

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What's the difference between typhoon, tropical storm and tropical cyclone?

Resident: What's the difference between a typhoon, a strong tropical storm and a tropical storm? "Mai Sha" has weakened into a tropical storm, so will Yantai be less affected? Meteorological Observatory: Typhoon is a kind of tropical cyclone. Tropical cyclone refers to the low pressure formed in tropical areas. When the typhoon landed, due to the influence of ground friction, the wind gradually decreased, and the central air pressure also increased and the intensity weakened. According to the degree of wind weakening near the tropical cyclone center, typhoons will weaken into strong tropical storms, tropical storms and tropical depressions in turn. The specific name corresponds to the central wind power as follows: when the central wind power is above 12, 12 (> = 32.7m/s) is called typhoon; 10 to 1 1 is called a severe tropical storm (24.5-32.6 m/s); Levels 8 to 9 (17.2-24.4m/s) are called tropical storms, and levels 6 to 7 are called tropical depressions (10.8-17.1m/s). This year's No.9 typhoon "Mai Sha" weakened into a strong tropical storm in Zhuji, Zhejiang Province on the afternoon of the 6th 17, and weakened into a tropical storm in the daytime yesterday, with a central wind of 23m/s (magnitude 9). It is expected that it will continue to move to the northwest at a speed of about 15-20km per hour in the future, and the intensity will be further weakened. Although the intensity of typhoon gradually weakens after landing, it often causes serious floods such as heavy rain and flash floods.

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Jiaodong August 26, 20051570

What are tropical storms, hurricanes and typhoons?

Typhoon has brought abundant rainfall to vast areas and become a rainfall system closely related to human life and production. However, typhoons always bring all kinds of injuries. Because of its sudden and destructive power, it is one of the most serious natural disasters in the world.

The destructive power of typhoons is mainly caused by strong winds, heavy rains and storm surges.

1. Strong typhoon is a huge energy pool, and its wind speed is above 17m/s, even above 60m/s ... According to the measurement, when the wind reaches 12, the wind pressure per square meter on the plane perpendicular to the wind direction can reach 230kg.

2. Storm typhoon is a strong rainfall system, which floats for typhoon landing. The rainstorm center can drop 100-300mm a day, even up to 500-800mm. The floods caused by typhoons and rainstorms are the most dangerous disasters. Typhoon rainstorm is strong, flood occurs frequently, spreads widely, and is fierce and destructive.

3. Storm Surge The so-called storm surge means that when the typhoon moves to the land, due to the typhoon's strong wind and low air pressure, the sea water accumulates strongly in the direction of the coast, the tide level rises sharply, and water waves are overwhelming to the coast. The storm surge of a strong typhoon can raise the coastal water level by 5-6 meters. Storm surge meets astronomical tide, resulting in high-frequency tide level, resulting in flooding, seawall burst, washing away houses and various building facilities, flooding towns and farmland, causing a large number of casualties and property losses. Storm surge will also cause coastal erosion and land salinization caused by seawater intrusion.

After the typhoon landed, the wind was greatly weakened and the central air pressure rose rapidly due to the influence of rough ground friction. But at high altitude, strong winds are still blowing around the low-pressure center, and the high-temperature and high-humidity air from the ocean is still rising and condensing, constantly making raindrops. If humid air meets a mountain, the windward slope will force it to rise and condense at an accelerated speed, and the rainstorm there will be more violent. Sometimes after a typhoon lands, it's too tired to move. Not only does the wind decrease, but even the low-pressure center moves slowly and even stays in one place. In this way, the rainstorm poured in the same area for several days and nights, and the disaster was more serious. According to the report of the World Meteorological Organization, the number of people who die from tropical storms around the world every year is about 2,000-3,000. According to relevant data, the average annual economic loss caused by typhoons in countries along the western Pacific Ocean is $4 billion. China is also a country with severe typhoon disasters.

South China is most frequently affected by typhoons, with Guangdong and Hainan being the most serious. In some years, as many as 14 typhoons landed in these two provinces. In addition, Taiwan Province, Fujian, Zhejiang, Shanghai, Jiangsu and other provinces and cities are also frequently affected by typhoons. Some typhoons will go further inland after landing from the coastal areas of China. Among the countries along the western Pacific, there are about 7 typhoons landing in China every year, accounting for 35% of the total number of typhoons landing in this region. The impact of typhoon on the landing area is enormous. For example, typhoon 97 1 1 was generated at 8: 00 am in August 1997 and landed in Wenling, Zhejiang at 2: 00/30 on August 18. The severe situation of storm and "three encounters" immediately appeared in Shanghai. There is 8- 10 gale in Shanghai and 59-87 mm rainstorm in some areas, 152. 1 mm. The tidal levels along the Yangtze River estuary and Huangpu River have both exceeded historical records. The tidal level at Huangpu Park Station is 5.72m, which exceeds the warning line1.17m, which is equivalent to the 500-year return period. There were 3 outlets in the urban flood control wall, nearly 20 overflows, 39 power lines were cut, 952 power grids failed, 70 streets were flooded, more than 500 houses collapsed and more than 2,000 houses were damaged. The affected farmland in the suburbs is nearly 500 square kilometers. As a result, the flight of 135 could not take off and land on time, and all 22 ferry routes were suspended. The direct economic loss is about 630 million yuan; /KOOC-0/994, 94/KOOC-0/7 typhoons landed in Rui 'an, Zhejiang Province, and the "wind and rain tides" met, affecting 7.5 million mu of crops in the province and killing/KOOC-0//KOOC-0/26 people; 1996, Typhoon No.9608 landed in Keelung, Taiwan Province Province and Fuqing, Fujian Province, causing more than 54 million mu of crops to be affected, and more than 700 people died in 10 provinces and cities. 1997, Typhoon 97 1 1 landed in Wenling, Zhejiang Province and Jinzhou, Liaoning Province successively. 10 affected more than 6,543.8 billion mu of crops in many provinces and cities, with 240 deaths. 200 1 Guangxi was hit by two typhoons "durian" and "ute" continuously, and there was a large-scale rainstorm or heavy rain. Tens of millions of people in 48 counties and cities in the region were affected, and more than 400,000 people were once trapped by floods. ...

What does "typhoon landing" mean?

The definition of typhoon landing is "the typhoon center moves to land as a whole". In other words, the place where the typhoon center landed is called "Taiwan Yuanbao landed somewhere".

Because typhoons do not necessarily have typhoon eyes, it is not accurate to say that typhoon eyes reach land.

What does the typhoon blue warning mean?

Typhoon warning signals are divided into four levels, which are represented by blue, yellow, orange and red respectively.

(1) Typhoon blue warning signal

Meaning: It may be affected by tropical depression within 24 hours, with an average wind force of above 6 or a gust of above 7; Or it has been affected by tropical depression, with an average wind force of 6-7, or a gust of 7-8 and may continue.

Defensive measures:

1. Prepare for wind protection, and relevant departments start the defense work plan;

2. Pay attention to media reports on the latest news of tropical depression and windproof notices;

3. Fasten doors and windows, hoardings, scaffolding, outdoor billboards, temporary structures and other structures that are easily blown by the wind, and properly arrange outdoor items that are easily affected by tropical depression.

(2) Typhoon yellow warning signal

Meaning: It may be affected by tropical storms, strong tropical storms and typhoons within 24 hours, with an average wind force of 8 or above or a gust of 9 or above; Or it has been affected by tropical storms, with an average wind force of 8-9, or a gust of 9- 10 and may continue.

Defensive measures:

1. Enter the windproof state, and relevant departments start the defense work plan;

2. Close the doors and windows, residents and ships in dangerous areas and dangerous buildings take shelter from the wind, outdoor workers such as high altitude, beach and water stop working, and staff in dangerous areas evacuate in time. ...

(3) Typhoon orange warning signal

Meaning: It may be affected by tropical storms, strong tropical storms and typhoons within 24 hours, with an average wind force of 8 or above or a gust of 9 or above; Or it has been affected by tropical storms, with an average wind force of 8-9, or a gust of 9- 10 and may continue.

Defensive measures:

1. Enter the windproof state, and relevant departments start the defense work plan;

2. Close the doors and windows, residents and ships in dangerous areas and dangerous buildings take shelter from the wind, outdoor workers such as high altitude, beaches and water stop working, workers in dangerous areas evacuate in time, collective outdoor activities stop in time, and do a good job in evacuation;

3. Cut off neon signs and dangerous outdoor power supply;

Other typhoon blue warning signals.

(4) Typhoon red warning signal

Meaning: It may be affected by typhoon within 6 hours, and the average wind power can reach more than 12; Or has been affected by the typhoon, the average wind power has reached more than 12, and may continue.

Defensive measures:

1. When entering the special emergency windproof state, the relevant departments will start the defense work plan, and the relevant emergency rescue units will be ready to start the emergency rescue plan at any time;

2. Close the doors and windows, residents and ships in dangerous areas and dangerous buildings take shelter from the wind, outdoor workers such as high altitude, beaches and water stop working, workers in dangerous areas evacuate in time, collective outdoor activities stop in time, and do a good job in evacuation;

Other orange warning signals of the same typhoon.