What's the weather like when the cold wind crosses the border?

When the cold front crosses the border, there will be heavy rain and snowstorm, and the temperature will drop.

Before the cold front crossed the border, the temperature was high, controlled by the warm air mass, and the air pressure was low. After the cold front crossed the border, under the control of the cold air mass, the temperature was low, the air pressure was high and the weather was fine. The front formed by the active movement of cold air mass to warm air mass is called cold front. Cold front is the most common front in China, and it can move all over the country. The pressure in front of the front drops sharply, and the pressure behind the front rises. The temperature drops; Gradient increase; Atmospheric pressure increases obliquely; The wind direction changes clockwise; There is precipitation, even thunderstorms.

Generally, this situation only occurs in mid-latitude areas, and it may also occur in late spring and early summer in low-latitude areas, because the cold front at that time generally develops at latitude 25 ~ 30, while the temperature in low-latitude areas is generally high, and it is easy to generate lightning in the case of high-temperature friction.

Characteristics of cold front after transit;

1. After the cold front, the towering cumulonimbus clouds and cumulonimbus clouds begin to dissipate into cumulonimbus clouds, and the corresponding precipitation will also decrease.

2. The weather will start to clear up, and eventually the visibility will become very good.

The temperature is still colder, but the atmospheric pressure continues to rise. The front formed by the active movement of cold air mass to warm air mass is called cold front. Cold front is the most common front in China, which can be moved to all parts of the country. Because cold air is heavy and warm air is light, when the cold air mass moves, it will form a cold air mass that actively wedges under the warm air mass, forming a front at the junction of cold and warm air.

When a cold front crosses the border, cumulonimbus clouds, thunderstorms and heavy precipitation often occur. If the cold front moves fast, cumulonimbus clouds are distributed in the narrow area in front of the front, and then it will turn from local cloudy to sunny quickly after the front; If the cold front moves slowly, it will form a large range of high-level clouds and nimbostratus.

Reference to the above content: Baidu Encyclopedia-Cold Front