thundershower

Little or no running water is to be found, and only after a thundershower are the pools filled.

As I sped along, the sky deepened and a severe thundershower threatened.

The day was hot and sultry, though a heavy thundershower somewhat cooled the air.

Within ten minutes a thundershower was falling, and almost as if by magic, all that snow melted away.

It couldn't have been lightning, for there hasn't been a thundershower this season.