By a widely accepted definition, a cloudburst means more than 100 mm of rainfall in one hour, over a small area.

Cloudbursts are causing chaos in mountainous parts of India and Pakistan, with tremendous amounts of rain falling in a short period of time over a concentrated area. The intense, sudden deluges have proved fatal in both countries.

Cloudbursts, massive downpours that deliver over 100mm (4 inches) of rain in a single hour, have caused devastating floods in both Pakistan and India during this monsoon season, claiming hundreds of lives.