Beijing's beautiful blue sky "cold vortex blue" continues, accompanied by scattered thunderstorms
2024-08-14
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Since this week, the sky in Beijing has turned into a beautiful cartoon-like "cold vortex blue", which netizens have vividly called the "beautiful blue sky". In addition, the temperature and humidity are lower than before, and the air is no longer so "sauna-like", instantly giving people a feeling of the cool and refreshing autumn weather.Why is the weather so beautiful and comfortable under this unique weather phenomenon called "Cold Vortex Blue"?
Photo by Wen HongzhengThe meteorological department explained that a cold vortex is a low-pressure system with a cold center that exists in the middle and upper levels of the troposphere. It is usually formed in the high-altitude trough of the westerly belt. When the cold advection strengthens and penetrates deep into the trough, it is possible to cut off the trough line, thus forming a closed low-pressure system, which is a cold vortex. The cold vortex that affects the Beijing area can be mainly divided into two types, the Northeast Cold Vortex and the North China Cold Vortex, depending on the location of its center. Since the cold vortex is a closed circulation, its guiding airflow is weak and its movement speed is relatively slow, so it can have a long-term impact on a certain area.
The formation of the "cold vortex blue" sky is mainly attributed to the cold air and clear weather brought by the cold vortex.As a closed circulation that rotates counterclockwise, the cold vortex will carry cold air with it, blowing away pollutants in the air and reducing the water vapor content in the atmosphere, which reduces the formation of clouds and presents a clear blue sky. The cold air will also lower the temperature, sweeping away the previous high temperature and heat.
But the cold vortex not only brings blue skies, but may also trigger precipitation, especially severe convective weather., so it needs special attention. Cold vortices can guide dry and cold air in mid- and high-latitudes to move southward. When the lower layer is warmed by warm advection and solar radiation, it often forms unstable stratification of "cold on top and warm on bottom" and "dry on top and wet on bottom", thus producing short-term heavy rainfall, thunderstorms, hail and even tornadoes and other severe convective weather.
The good news is thatIn the next few days, North China will continue to be affected by the cold vortex, and everyone can continue to enjoy the beautiful "cold vortex blue". But at the same time, we also need to be more careful about the scattered convective weather in North China under the influence of the low vortex.
According to the specific forecast in Beijing,In the forecast from the 14th to the 20th, there is the word "thunderstorm" every day. There will be scattered thunderstorms in the west and north on the nights of the 14th and 18th.There will be thunderstorms during the daytime of the 15th, 17th, 19th and 20th, and there will also be thunderstorms at night on the 16th. Thunderstorms are frequent, so please remember to pay attention to the upcoming weather forecast and warning information.
