A torrential downpour of rain, which by its spottiness and relatively high intensity suggests the bursting and discharge of a whole cloud at once.

a heavy rain

an extreme rainfall, which can be mixed with hail, and luckily does normally not last longer than a few minutes

a severe thunderstorm with very intense short-duration rainfall, often with hail, strong winds or tornadoes

the heaviest type of rain, in which rain falls at a rate of 4 inches (10 centimeters) or more per hour.

Any sudden and heavy rain shower.

A sudden, heavy rainfall of a showery nature.

A sudden, intense rainfall that is normally of short duration.

Rain storm of great intensity usually over a small area for a short duration.