In most cases it is lightning. Any cloud-to-ground lighting bolt can kill while rain is usually harmless. Rain, too, can be dangerous if it leads to flooding.
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Lightning is far more dangerous than rain.
I personally have been struck by rain many times, and have survived . . .
A thunderstorm that doesn't produce precipitation of any kind. This is dangerous in heavily wooded areas.
Lightning can strike up to 30 miles from a thunderstorm, though such instances are rare.
A thunderstorm, though most thunderstorms are not disasters.
The most dangerous part of a thunderstorm is lightning. Lightning can strike suddenly and cause injuries or fatalities, as well as start fires. It is important to seek shelter indoors during a thunderstorm to stay safe from lightning strikes.
A thunderstorm cloud is a type of rain cloud that produces thunder and lightning due to the presence of strong updrafts and downdrafts within the cloud. While rain clouds can produce precipitation in the form of rain, they do not necessarily have the same intense vertical movement and electrical activity as thunderstorm clouds.