What does the subtropical high in the weather forecast mean?
1. "Subtropical high" is a common term in meteorology, which is also "subtropical high". If you often pay attention to the weather forecast, then you should be familiar with this term.
2. In summer, the name of "subtropical high" is very loud. The continuation of the hot summer, the changes of rain belts, the direction of typhoons, it seems that most weather changes have a certain relationship with it. For example, the rainy weather in Beijing in July this year was caused by the "subtropical high". Since the southerly warm and moist air flow outside the "subtropical high" continuously transports water vapor to the north, Beijing, which is outside the "subtropical high", has abundant water vapor. Once there is a cold If air invades, it will rain.
3. The formation principle of the "subtropical high" is not complicated. The geostrophic deflection force generated by solar radiation and the rotation of the earth is the main reason for its "birth". Due to the strong solar radiation in the equatorial region, the air in the area rises and flows toward the pole when it reaches high altitudes. The geostrophic deflection force generated by the rotation of the earth causes the airflow to continuously shift. The higher the latitude, the greater the geostrophic deflection force. big.
4. As a result, in the subtropical region, the air flow basically changes from west to east, and hinders the subsequent air arrival, causing the air above the area to sink, thus creating a "subtropical high" . The "subtropical high" we are familiar with generally refers to the "subtropical high" located in the northwest Pacific Ocean in the northern hemisphere that has a greater impact on my country. It exists all year round and is a stable and infrequent warm and deep system.
5. In most cases, the Pacific subtropical high pressure has an east-west oblong shape. Sometimes there are several, sometimes there is only one. The changes in its intensity, scope and structure are closely related to my country's weather.
6. If the "subtropical high" is at the annual average position, then the climate in various places will be normal; on the contrary, if the "subtropical high" is deviated from the annual average position, the climate will be different from normal in various places. For example, areas with high rainfall may experience high temperatures and low rainfall, leading to droughts; areas with low rainfall may experience increased rainfall, leading to floods.