What is the difference between a cloudburst and heavy rain?

A cloudburst is an extreme, sudden downpour over a small area in a short time. The India Meteorological Department defines it as about 100 mm or more of rain in an hour over an area of roughly 20 to 30 square km.

It is far more intense than normal heavy rain. Cloudbursts are common in hilly regions like Uttarakhand, Himachal Pradesh and Jammu and Kashmir, where moist air is forced up the mountains quickly. Because so much water falls so fast on steep slopes, they often trigger flash floods and landslides.