In Meteorology, What Is Present Weather?

Weather refers to the specific state of the atmosphere near the earth's surface in a short period of time. The weather phenomenon refers to various natural phenomena that occur in the atmosphere, that is, various meteorological elements in the atmosphere (such as temperature, pressure, humidity, wind, cloud, fog, rain, flash, snow, frost, thunder, Comprehensive representation of spatial distribution of hail, haze, etc.).

Clear: It means that there is no cloud in the sky or sporadic clouds, but the amount of cloud accounted for less than 1/10 of the sky is called clear. Sometimes very high and thin clouds appear in the sky, but they have little effect on the sunlight. It's sunny. ^[7-8]

Thunderstorm is a severe weather phenomenon produced by the air under extremely unstable conditions. It often carries strong winds, heavy rain, lightning, lightning strikes, and even accompanied by hail or tornado, so it can often cause disasters.

The life of a single thundercloud (cumulonimbus) is short-lived, usually only one or two hours, during which it can be divided into three stages: development, maturity and dissipation. In the first stage, an updraft is formed to send warm and humid air into the air. When the rising air is cold, water vapor starts to condense and turns into clouds. As the airflow continues to rise, the clouds will accumulate and rise to colder altitudes. The drops of water in the clouds became bigger and heavier. Some freeze into snow or hail, and some raindrops become larger and larger, and then begin to fall until they can no longer be supported by the updraft. The downdraft that comes with or comes before the rain will cause a cool gust, which means a

Around 650 BC the Babylonians used the appearance of clouds to predict the weather. Around 340 BC, Aristotle described different weather conditions in his Astrology. The Chinese have records of weather forecasts at least about 300 BC. The ancient weather forecast mainly relied on certain weather phenomena. For example, people observed that there is often good weather after sunset. Such observations have accumulated

Weather forecast is to apply the laws of atmospheric changes to predict the weather conditions of a certain place in the future according to the current and recent weather conditions. It is based on the analysis of satellite cloud maps and weather maps, combined with comprehensive research on relevant meteorological data, topographic and seasonal characteristics, and mass experience. For example, the satellite cloud image of China's Central Meteorological Observatory was taken by the "Fengyun-1" meteorological satellite manufactured by China. Using satellite cloud photos for analysis can improve the accuracy of weather forecasts. The weather forecast is usually divided into three types: short-term weather forecast (2 to 3 days), medium-term weather forecast (4 to 9 days), long-term weather forecast (more than 10 to 15 days). CCTV broadcasts daily mainly Short-term weather forecast. [1]

The main content of the weather forecast is the overcast, rain, snow, maximum and minimum temperature, wind direction and wind, and special severe weather in a region or city in the future. As far as China is concerned, meteorological stations can accurately predict the location and intensity of natural disasters such as cold waves, typhoons, and heavy rains, which can directly serve industrial and agricultural production and people's lives.

Weather forecast is based on meteorological observation data, applying the principles and methods of meteorology, dynamic meteorology, and statistics to make qualitative or quantitative predictions of the weather conditions in a certain area or location for a certain period of time in the future. It is an important goal of atmospheric science research. It is of great significance to people's lives.

Today, when people go out, they only need to listen to or watch the weather forecast to decide whether to bring rain gear. In the past, they had to worry about the weather. So how does the weather station's most important job every day-weather forecasting come into being.