According to expert analysis, when the sky is overcast and the temperature in the high-altitude clouds is below 0℃, the water vapor in the clouds will condense into snow. Snowflakes fall from the clouds, but are they snow or rain when they fall on the ground? This depends on the temperature within a few hundred meters of the surface layer. If the temperature in the surface layer is relatively high, when snowflakes fall, they will melt again in the low air near the surface layer and become raindrops. At this time, what we see is falling. rain. On the contrary, if the temperature near the ground layer is relatively low and the snowflakes cannot melt, it will snow. Generally speaking, when the ground temperature is 3℃ or below, snow will appear.

 

Thunderstorms occur when warm and humid air currents are uplifted by cold air or mountains and produce cumulonimbus clouds. For example, on the night of March 12, 1970, thunderstorms occurred in the middle and lower reaches of the Yangtze River in my country. At that time, the cold air at the surface layer descended from North China to the middle and lower reaches of the Yangtze River. After the evening, the temperature in this area dropped to about 0°C, and it was ready for snow. At that time, the cold air from the south and the strong warm and humid air from the north converged in this area, and the warm air climbed violently along the lower-level cold air, so strong convection occurred in the stratiform clouds that were about to snow, forming accumulated rain Clouds, so there will be a weather phenomenon with snow on one side and thunder on the other side. Experts also believe that the rare phenomenon of thunder and lightning with heavy snow is mainly due to the huge energy generated by the intersection and collision of cold air and warm and humid air from the south, resulting in thunder and lightning. The temperature difference between the upper and lower atmospheres also creates the occurrence of thunder and lightning in winter. A strong motivation.

 

This kind of weather change is very rare in the history of meteorology, and there is currently no definition for it in meteorology. Generally speaking, thunder seldom occurs in September and October every year. This kind of weather is very rare. There was a thunderstorm in Beijing on November 3, 1979, but no rain or snow was recorded at that time. This is the second time, and this is the latest thunder in a year since the weather records are available.

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Aug. 10, 2020