We just learned about thunder snow.
There is also something interesting called heat lightning.
Sometimes when you are out in the evening on a hot sunny day, you can see lightning flashes from very far away but you don't hear any thunder.
There actually is some thunder for the lightning, but since the skies are clear you can see very far and the sound of the thunder doesn't reach that far.
(from: wikipedia - heat lightning)
Kid Facts - Blast from the past: Calcium
