Why are there so many typhoons in the United States

Located in the westerly wind belt, the formation of a typhoon The conditions necessary for the formation of a typhoon: a vast high temperature ocean. The formation and development of typhoons requires huge energy, and its energy is mainly due to the latent heat released by the condensation of a large amount of water vapor.

On the tropical ocean, the sea temperature is high, the evaporation is strong, and a large amount of heat and water vapor is transported to the atmosphere through turbulent movement, with unstable conditions of high temperature and high humidity, and its large amount of internal energy is the huge energy generated and developed by typhoons**. Suitable flow field. Suitable circulation conditions can initiate and induce the disturbance of high temperature and high humidity air, so that the air flow convergence rises.

Appropriate geostrophic deflection force. After the air flow is generated, there must be a certain amount of geostrophic deflection force. If the geostrophic deflection force does not reach a certain value, the air flow converging towards the center of low pressure will reach the center of low pressure, so that the filling cannot form a cyclonic vortex and the typhoon cannot form.

Therefore, most typhoons occur between 5° and 20° north latitudes. The vertical shear of the wind is smaller. Under the action of geostrophic deflection force, the convergence updraft develops into a cyclonic vortex.

The air flow rises, and adiabatic cooling produces condensation, and the latent heat released by the condensation warms the air. The vertical shear of the wind is small, so that the latent heat does not spread outward, and the warm structure of the typhoon is maintained. The heart-warming feedback effect caused the central pressure of the typhoon to continue to drop, and the air vortex rotated more and more strongly, and finally developed into a typhoon.

Movement of a typhoon Movement occurs after a typhoon is formed. The path is basically along the outer edge of the subtropical high, from east to west. However, due to many factors, the movement path is complex.

Taking the western North Pacific region as an example, the path of a typhoon is divided into three paths: westward path. The typhoon moved westward from the ocean east of the Philippines, passed through the South China Sea, and made landfall on Hainan Island or Vietnam.

Northwest Path. The typhoon moved northwest from the ocean east of the Philippines, passed through the Ryukyu Islands, and made landfall in Jiangsu, Zhejiang and Fujian in China. Steering path.

The typhoon moved northwest from the ocean east of the Philippines and then turned northeastwards in a parabolic path. Other.

Two scientists from the School of Atmospheric Sciences at Colorado State University in the United States recently said that this year's Atlantic hurricane season is likely to be unusually active, with five Category 3 or stronger hurricanes forming, and the probability of a strong hurricane making landfall in the United States this year is 140% of the average average. They said that based on the anomalous warming in the tropical waters of the eastern and central Pacific and the anomalous cooling in the tropical Atlantic, they believe that this situation is more likely to lead to an unusually active hurricane season than in previous years. To make matters worse, in 2011, one or more strong hurricanes could make landfall on the Louisiana coast of New Orleans, which has a 27 percent chance of being hit by another hurricane, and the region has yet to fully recover from Hurricane Katrina in 2005.

Because the United States has the Atlantic Ocean to the east and the Pacific Ocean to the west, and North America is too small for Eurasia, tornadoes can occur when the convection of the two oceans interacts. That's why we don't have tornadoes in China, they do!

The United States is not called a typhoon, it is a hurricane, it generally originates in the subtropical ocean, forming a low pressure center, the air will rotate under its huge force, forming a cyclone, the northern hemisphere will move to the northwest due to the geostrophic deflection force

The geographical location, climate and environment, all have an impact.

There are no typhoons in the United States, only tornadoes.

1. The place of occurrence is not copied.

Hurricanes that occur in the eastern North Pacific and the Atlantic Ocean, and typhoons that occur west of the International Date Line, the western North Pacific, and the waters of China. In other words, what happens near the United States is a hurricane, and what happens near China and Japan is a typhoon.

2. The judging criteria are different.

Hurricanes are classified as 1 to 5 as described above, and each corresponds to different wind speeds, storm surges, and levels of damage. According to international practice, the criteria for judging typhoons are based on the strength of the wind at the center of the typhoon.

Specifically, it is divided into tropical depression (m s), tropical storm (severe tropical storm (typhoon (strong typhoon (and super typhoon (greater than.

3. The measurement method and unit are different.

The average wind speed over a 1-minute period at the lowest central position of a tropical cyclone for hurricanes is a relatively high value, usually measured in kilometers or miles per hour. In China, the average wind speed of 2 minutes is used to assess typhoons, so the relative intensity of typhoons will be smaller, measured in meters per second.

Difference Between Typhoon and Hurricane.

Typhoons and hurricanes are tropical cyclones in the Northern Hemisphere, but because they are generated in different sea areas and are called by different names in different countries. In the Northern Hemisphere, cyclones that form over the oceans east of the International Date Line to the Greenwich meridian are called hurricanes, while tropical cyclones that form over the oceans west of the International Date Line are called typhoons. Generally speaking, tropical cyclones that form in the Atlantic Ocean are called hurricanes, while tropical cyclones that form in the Pacific Ocean are called typhoons.

A typhoon is a strong cyclonic vortex that occurs in tropical oceans, always accompanied by violent storms and rain. A system of low pressure that develops over the tropical ocean is called a tropical cyclone, and is generally referred to as a typhoon above level 12 according to the maximum wind level near the center. Intense tropical cyclones are accompanied by violent storms, high waves, and storm surges.

Three conditions are required for hurricanes to form: warm waters; humid atmosphere; The wind on the surface of the ocean is able to turn the air into an inward swirling flow. In most storm structures, the air gets warmer and rises higher and higher, eventually flowing into the outside atmosphere.

If the winds are lighter at these higher levels, then the storm structure will be maintained and developed. In the eye of the hurricane, the center of the hurricane, the sky is relatively calm. The most violent weather phenomena occur in the surrounding atmosphere near the eye of a hurricane, known as the (hurricane) eyewall.

In the upper layers of the eyewall, most of the air flows outward, exacerbating the upward motion of the atmosphere.

What difference can it make? Not all the same.

I guess it's the difference between the land breeze and the sea breeze.

Typhoons (called hurricanes in the eastern Pacific Ocean) are generally generated at low latitudes, and the atmospheric circulation here is directed by easterly winds, so the typhoons in the Pacific Ocean are all westward, and in the middle latitudes, the guiding wind direction changes to the westerly, and then the typhoon will turn, but Mexico is a plateau, blocking the Pacific typhoon for the United States.

The western North Pacific region is called a typhoon, while the North Atlantic and Eastern Pacific regions of the United States are called hurricanes.

The United States is also one of the most prone countries for typhoon disasters, but the United States calls it a hurricane.

In fact, there is no US standard, and the meteorological observatory admits that China's typhoon forecast is indeed worse than that of the United States, mainly because of the lack of data.

In the forecast of the whereabouts of the "plum blossom", most meteorological agencies at home and abroad have fallen under its "skirt".

Since the early morning of August 2, Chinese mainland, Taiwan, Hong Kong, Japan, the United States, Europe and other meteorological agencies have carried out ** on the landing point of "Meihua", from southern Zhejiang to Shanghai, but in the end, only the ** of the United States and Japanese meteorological agencies are relatively accurate, and have always insisted that "Meihua" will go north along the coastal water.

In this regard, meteorological experts said that there is indeed a certain gap between China and developed countries such as the United States in terms of weather forecasting, mainly due to the lack of observation data, especially for the forecast error of typhoon track anomalies and sudden changes in intensity.

As for how to evaluate the accuracy of the forecast of the Shanghai Meteorological Department, Fu Yi, chief service officer of the Municipal Meteorological Bureau, said that the work of the meteorological department's typhoon track yesterday has not been completely completed, and it is estimated that it will take another day or two to summarize and analyze.

A typhoon is a classification of tropical cyclones in countries or regions in Asia and the Pacific north of the equator and west of the date line. In meteorology, a tropical cyclone with sustained winds of 12 knots or more (i.e. 64 knots or more, meters per second or more, or 118 km/h) at its centre is defined by the World Meteorological Organization (WMO) as a hurricane or other local synonym.

The synonym used in the Northwest Pacific is typhoon. The World Meteorological Organization (WMO) and the Japan Meteorological Agency (JMA) both use this as the highest level of tropical cyclone, but some meteorological departments will set up higher levels as needed, such as severe typhoons and super typhoons at the ** China Meteorological Observatory and the Hong Kong Observatory, severe typhoons at the ** Meteorological Bureau in Taiwan, and super typhoons at the Joint Typhoon Warning Center in the United States.

Typhoons are called "hurricanes" in the United States.

The word hurricane is derived from the Caribbean word for demon Hurican, and it is also said that one of the creation gods in Mayan mythology, Hurakan, the god of thunderstorms and whirlwinds. The word typhoon is derived from Typhon, the son of Gaia, the mother of the earth, in Greek mythology.

Both hurricanes and typhoons refer to tropical cyclones with winds of more than 33 meters per second, but they have different names depending on the region where they occur. Severe tropical cyclones that occur in the northwest Pacific Ocean and the South China Sea are called "typhoons". Hurricanes that occur in the Atlantic, Caribbean, and eastern North Pacific are called "hurricanes"; Cyclones that occur in the Indian Ocean, the Arabian Sea, and the Bay of Bengal are called cyclones.

In fact, they are all the same, but the culture is different, so the names are different. They are all tropical storms, and there is not much difference, but the power and damage value of each typhoon are different.

The United States is often hit by hurricanes, which is related to the terrain of the continent where it is located, with the ** Great Plains in the middle, running through the north and south, so the formation of tropical storms in the south will move to the north unscrupulously and cause damage. And our Asia is low in the east and high in the west, and it wants to go in the typhoon, but the mountains block it.