Common weather symbols in weather forecast

Weather symbols are graphic signs used to repre sent different meteorological conditions. They are widely used in weather forecasts to convey weather information in a concise way. The following are common weather symbols and their meanings in weather forecasts:
1. Sunny: ☀, ☼, ♨
2. Cloudy: ☁, ☂
3. Night: ☽, ☾
4. Snow: ❄, ❅, ❆, ☃
Weather symbols are mainly divided into two categories, corresponding to weather phenomena during the day and night.
Weather forecast is a pre diction of the state of the atmosphere at a certain location in the future based on modern science and technology. Since pre historic times, humans have been trying to pre dict the weather in order to rationally arrange work and daily life. Today's weather forecast uses a large amount of data (such as temperature, humidity, wind direction and speed, air pre ssure, etc.), combined with meteorological knowledge, to pre dict future air changes.
Although atmospheric processes are complex and not yet fully understood by science, there are still certain errors in weather forecasts. my country's Central Meteorological Observatory uses satellite cloud images to improve forecast accuracy. Weather forecasts are divided into short-term, medium-term and long-term based on timeliness.
Ancient weather forecasting was mainly based on the principles of yin and yang and the five elements, and pre dicted weather by observing natural phenomena. Ancient China divided all things in the world into the five elements of metal, wood, water, fire, and earth, plus the state of yin and yang, and pre dicted the weather based on the interaction of these elements.
With the development of technology, numerical weather pre diction has become the main method to pre dict future weather through the integration of atmospheric motion equations. Since the 20th century, forecasting technology has improved significantly, especially after the launch of meteorological satellites, which has filled the information gaps in areas with insufficient data.

How many types of weather symbols are there?
Weather symbols are graphics or symbols that describe weather conditions and are often used in weather forecasts and meteorological charts. The following are some common weather symbols and their meanings:
1. Sunny: It means that the cloud cover in the sky is less than 30% and the weather is clear.
2. Overcast: It means that the cloudiness in the sky reaches 90% or more and the weather is gloomy.
3. Fog: It means that there are a large number of tiny water droplets or ice crystals floating in the air near the ground, and the horizontal visibility drops to less than 1 kilometer, which will affect transportation.
4. Light rain: means that the daily pre cipitation is less than 10 mm and the weather is light rain.
5. Heavy rain: It means that the daily pre cipitation is between 25.0-49.9 mm, and the weather is heavy rain.
6.Thunderstorm: means bursts of pre cipitation that come and go and are accompanied by lightning and thunder.
7. Hail: It means that with the intense vertical movement in cumulonimbus clouds, small hail nuclei repeatedly rise, condense, fall and melt, growing into small ice cubes with alternating transparent layers and falling, which has an impact on crops.
8. Freezing rain: means raindrops frozen on the ground on the surface of objects below 0℃, also known as rain (frozen by fog droplets, called rime), often falling down and breaking wires, causing the road to freeze. Affecting communications, power supply, transportation, etc.
9. Sleet: It means that the temperature near the ground is slightly higher than 0℃, wet snow or rain and snow fall at the same time.
10. Light snow: means that the daily snowfall (melted into water) is less than 2.5 mm.
11. Moderate snow: Indicates that the daily snowfall (melted into water) is between 2.6-4.9 mm.
12. Heavy snow: means that the daily snowfall (melted into water) reaches or exceeds 5.0 mm.
13. Frost: It means that water vapor condenses into white crystals on the surface of the ground and objects with a temperature below 0°C. It is called hoar frost. If the water vapor content is low and there is no frost, it is called black frost. It will cause freezing damage to crops and is called frost.
14. Low-pre ssure trough and high-pre ssure ridge: repre sent the undulating high-altitude westerly airflow. The trough corresponds to the low-pre ssure trough. The warm air in front of the trough is active, rainy and snowy weather, and the cold air behind the trough controls the windy and cooling weather; the wave crest Corresponding to the high pre ssure ridge, the sky will be clear.
15. Cold front and warm front: It means that the cold front is the front of the cold air. At the junction of the cold and warm air masses, the cold air pushes towards the warm air. There will be strong wind and rain on the cold front, and it will be windy and cooling after the front. On the contrary, it will be cloudy and rainy on the warm front, and it will become cloudy and sunny after the front, and the temperature will rise.
16. Strong wind: repre sented by wind arrows, consisting of wind poles and wind feathers. The wind direction pole refers to the direction of the wind and has 8 directions. The wind plume consists of 3 or 4 dashes and triangles repre senting the force of strong winds, vertically to the right of the end of the wind pole (Northern Hemisphere).