Tell me a few tips about the weather.

People often think that the weather is unpredictable. In fact, the weather has its own rules, and we can sum up some interesting rules from our daily life. For example, "predict" meteorological changes from windy weather.

As the saying goes, "three winds and three winds blow for three days", which means that if there is strong cold air from the north in spring, it will blow very hard. After the strong wind passes, there will be a small cold air moving intermittently behind it, which usually lasts for two or three days. "The turning wind is particularly strong" means that when the wind moves in a certain direction, if there is a front crossing, there will be a storm warning. "It's sunny in the west and windy in the west, and it's sunny in the west" means that although there is warm and humid airflow from the ocean, it is not easy to rain if there is no cold air rising; If there is cold air from the northwest at this time and the warm and humid airflow rises, it will easily turn into clouds and cause rainfall. If the northwest wind blows in the case of long rain, it will drive out the local warm and humid air, so the weather will clear up soon. "The wind blows a large area and the hail hits the front line." Wind is a flowing atmosphere, so it involves a wide range and a large area. Hail is an ice crystal frozen by water vapor, which will drop several times before falling to the ground. Due to the uneven disturbance intensity in the cloud, the width of the strong disturbance cloud that can form hail is generally only three to five kilometers, and the hail area is banded.

How to know the weather from the clouds?

Cloud is the most obvious and direct sign of weather change. The shape, quantity, movement, color, thickness and appearance of clouds reflect the movement and moisture state of the atmosphere. Therefore, the evolution of clouds can predict future weather changes.

There are clouds hanging in the sky and rain dripping on the ground. Hook cloud is called hook cloud in meteorology, which generally appears in front of warm front and low pressure. The appearance of hook clouds indicates that a front or low pressure is coming, which is a precursor to rain. But after rain or winter, there will be sunny days or frost, so there is a proverb that "the hook cloud dissipates, the sunny day is dry" and "the winter hook cloud dries up"

"There are carp in the sky, so you don't have to turn over the grain tomorrow" (Wayun, who is sunburned). Carp spot refers to translucent cumulus clouds, and the air mass that produces this cloud is stable. In the evening, when encountering downdraft, the cloud dissipated faster, and it cleared up the next day. However, if the cloud looks like a tiny fish scale, it is cirrocumulus. This kind of cloud mostly appears in front of the trough of low pressure or around the typhoon, and there will be wind or rain in the near future. Therefore, there is a proverb "It doesn't rain, but it's windy".

"The clouds are heading east, blowing gusts; Where does the cloud go? Put on hemp fiber. " The cloud referred to here is the low cloud in the low pressure area. The low pressure is from west to east (in fact, it often moves from southwest to northeast). The cloud goes west, indicating that this place is in front of the low pressure, because it will rain locally; The cloud is moving eastward, indicating that the low pressure has moved past the local area, and the local area is behind the low pressure. The weather is going to clear up, and a strong wind often blows before it clears up.

"The cloud hook is in that direction, and the wind comes from that direction." Cloud hook refers to the tail of hooked cirrus clouds, which appears in the sky, sometimes with small hooks at the top, arranged in rows. The upper hook refers to the direction of the high-altitude wind, which is often connected with the ground, so the direction of the cloud hook can generally tell the direction of the wind.

Dark clouds cover the morning, and the wind comes without rain. It means there are dark clouds in the southeast in the morning, which indicates rain. Because the warm and humid southeast wind blows in the morning, the temperature is higher than the local air, which causes the upper part to be cold and the lower part to be hot, and the water vapor easily rises into clouds. In addition, during the day, the ground is heated, and the air convection rises, which further promotes the cloud to rise. When it is cold, the water vapor becomes water droplets, which may make it windless and rainy.

Huang Yun is flying up and down. It's going to lay ice eggs. Most of the yellow clouds are caused by the strong rise of warm and humid air. In this case, there are many showers and hail.

"The mountain wears a hat, and the rain is coming." Wearing a hat on the mountain means that the air pressure is low, and most of the water vapor in the air forms clouds at the top of the mountain. As for whether it will rain, it generally depends. If the clouds gradually decrease and thicken, there is a great possibility of rain. On the contrary, if the clouds gradually rise and thin, the possibility of rain is small.

"Clouds eat fog, and fog eats clear clouds". After seeing the fog, the clouds came. Maybe a low pressure is coming, which is a sign of rain. On the contrary, if the clouds clear, it means that the low pressure has passed and sunny weather is coming.