What is the weather sign of hail? Understanding of two hail weather symbols

The symbols of hail 2 1 13 in the weather forecast are as follows: small triangle: 526 1.

Weather forecast hail grade symbol: 4 102.

Hail disaster is a serious meteorological disaster caused by strong convective weather system 1653. Although it appears in a small area and a short time, it is fierce and strong, and is often accompanied by other weather processes such as strong winds and heavy rains.

China is a country with frequent hail disasters. Hail brings huge losses to agriculture, construction, communication, electricity, transportation and people's lives and property every year. Many people have encountered hail in thunderstorm weather. Usually, these hailstones will not exceed the size of softball, they fall from the storm clouds.

However, sometimes the hail is very heavy. Once 80 kg of hail fell from the sky and broke into many small pieces when it landed on the ground. The most mysterious thing is that when the sky is cloudless, huge hail falls from the sky. There have been many incidents that confirmed that the wing of the plane was hit by hail, and scientists still can't explain why there was such a huge hail.

According to relevant statistics, the economic losses caused by hail in China reach hundreds of millions or even billions of yuan every year. Since 1980s, with the extensive application of advanced equipment such as meteorological radar, satellite cloud image reception, computer and communication transmission, and various numerical forecasting models in meteorological operations, the ability of tracking, monitoring and forecasting hail activities has been greatly improved.

Extended data:

Prediction of hail;

Feel hot and cold: If the hail season is cool in the morning, with high humidity and strong solar radiation at noon, resulting in strong air convection, it is easy to develop into cumulonimbus clouds and form hail. Therefore, there is a saying that "the morning is chilly, and the head is broken in the afternoon" and "the dew is heavy in the morning and the hail is fierce in the afternoon".

Identify the wind direction: there is often strong wind before hail, but the wind direction changes sharply. There are some agricultural proverbs, such as "evil clouds see the wind grow, hail falls with the wind", "wind twists clouds, hail flakes" and so on. In addition, if the south wind continues to blow, the wind direction becomes northwest or north wind, and when the wind increases, hail often follows, so there is a saying that "no east wind blows, no rain blows, no south wind blows, no hail falls".

Cloud-watching state: There are many proverbs all over the country to explain the precursor of hail from the color of clouds, such as "If you are not afraid of dark clouds, you are afraid of red clouds, but most afraid of white worms growing in red Huang Yun" and "The tail of dark clouds, hail killed cattle and sheep", because the top of hail was black at first, then red in the middle, forming white, black and red clouds, and the edge of the clouds was yellow.

There are also sayings that the cloud shape is a precursor of hail, such as "the dark clouds rolled into a ball in the afternoon, and the wind, rain and hail came together", "the sky was yellow and sultry, and the clouds rolled over, and the Tianhe water roared to prevent hail", indicating that the air convection was extremely strong at that time, and the clouds developed rapidly, like smoke going straight up and down, and the clouds rolled up and down, which made it easy to hail.

Listen to the thunder: the thunder is dull. In succession, the masses called this kind of thunder "Remore". Therefore, there is a saying that there is nothing wrong with thunder, and it is boring to lay an egg. This is because the frequency of horizontal flash in hail cloud is higher than that of vertical flash, and the range is wide The thunder and echoes emitted by various parts of lightning are mixed together and sound continuous.

Understanding lightning: Generally, lightning in hail clouds is mostly inter-cloud lightning, that is, "horizontal lightning", which shows that the process of forming hail in clouds is very difficult. Therefore, there is a saying that "vertical lightning can come, and horizontal lightning can prevent hail disasters".

Look at the image: Look at the image and have a lot of experience in hail measurement. For example, there are proverbs in Guizhou, such as "the geese fly low, the hail will come quickly", "the willow leaves fly, and the sky hails", and in Shanxi, there are "cattle and sheep don't lie on the beam at noon, beware of hail in the afternoon" and "the grass is white and the hail is steady". It should be noted that the above experience can not be judged by only one article, but should be comprehensively analyzed and applied.

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