What does it mean to add lightning under the cloud?

Adding lightning under the clouds means a 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. When a thunderstorm comes, there are often strong winds and thunderstorms. Persistent and intense thunderstorms can often reach the level of heavy rain.

The water droplets in the cloud merge and increase until the rising hot air can't hold it, and then fall straight from the cloud. The hot air at the lower level was drenched by rain and suddenly became cold. Instead of rushing up, it turned to the ground. At this point, the charge in the air began to discharge, accompanied by thunderous thunder.

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Matters needing attention in thunderstorm weather:

1. The rainfall period is often accompanied by strong convective weather such as short-term heavy precipitation, thunderstorms and strong winds. The public should pay attention to closing doors and windows to prevent lightning from directly hitting the room or preventing the invasion of side flash and ball lightning;

2. Shower, solar water heater, etc. It should not be used, because the water pipe is connected with lightning protection measures, and lightning current may be conducted through water flow; Before the thunderstorm comes, disconnect the power cord and unplug the power plug, so as not to let lightning such as TV sets and computers enter the room, damage electrical appliances and even cause fire accidents; Don't pull the wires used to dry clothes and bedding to the window or door, in case the wires lead to lightning.

Baidu encyclopedia-thunderstorm

People's Network-Thunderstorms are sudden, so these safety knowledge should be put away.