What causes thunder and lightning? - Met Office

Thunderstorms develop when the atmosphere is unstable. This is when warm air exists underneath much colder air.

What causes lightning and thunder?, Weather Wise

Video: What Causes a Thunderstorm? NOAA SciJinks – All About Weather

Lightning Weather Wiz Kids

Why are there more thunderstorms during the summer?

What causes thunder and lightning? - Met Office

Ask the Weather Guys: What causes lightning?

What's the longest lightning bolt ever recorded?

10 striking facts about lightning - Met Office

Video: What Causes Lightning? NOAA SciJinks – All About Weather

Dry thunderstorm - Wikipedia