What weather phenomenon is there lightning under the cloud?

There is a flash of lightning under the cloud, which is a weather sign of thunderstorm.

Thunderstorm is a shower phenomenon accompanied by lightning? . Produced under thunderstorm cumulonimbus clouds. It is characterized by large-scale cloud movement, which is much more violent than showers and accompanied by discharge, and is common in summer. Therefore, the sign of thunderstorm weather is a rain cloud and a flash of lightning below.

Weather symbols In order to facilitate people to better understand the weather situation and transmit meteorological information, the meteorological department specially made weather graphic symbols. When observing a certain weather phenomenon, meteorological observers should record the corresponding symbols in the "Weather Phenomenon" column of the observation record book of the day, except for a few phenomena, and also record the starting and ending time.

Based on these symbols, combined with the intensity, coexistence and some characteristics of weather phenomena, a group of symbols that can be filled in weather maps are called cartographic symbols.

Extended data

Formation of thunderstorm

Thunderstorms mostly occur in summer afternoons and move from west to east. In summer, the surface of the earth is constantly exposed to the cool sunshine, and the temperature rises rapidly. The hottest time is one or two o'clock in the afternoon.

At this time, the hot air containing a lot of water vapor rises violently due to heating, and condenses into small water droplets at high altitude to form clouds due to cooling. When it rises to a height of seven or eight kilometers or even 9000 meters, it develops from a cumulonimbus cloud. The upper part of the cloud is ice crystals and the lower part is water droplets.

Water droplets collide with each other and increase. When the updraft can't hold up, or when there is downdraft, it falls to the ground and becomes rain. This is why there are many thunderstorms in summer afternoon.

Baidu encyclopedia-weather symbols

China Meteorological Network-Legend of Weather Forecast

China Meteorological Bureau-"Show your children but not your mother"