Rain falls from stratus clouds - the layered cloud type that blankets the sky over a large area - whereas showers fall from cumulus clouds - the towering convection cells that are more limited in extent. Hence showers are often described as scattered. Light and heavy refer to the intensity of rain - the amount that falls in an hour or day, or its ability to wet a surface. Light rain will wet a surface but won't create puddles - just a few millimetres in depth - whereas heavy rainfall will have measurable depth and create puddles. Other words describe the duration or frequency of rainfall over time - steady, short or intermittent.
Sudden heavy rain is called a Cloud Burst of a Squall.
A brief rainfall, usually of variable intensity.
It depends on if you mean heavy rain or light rain. If you mean heavy rain then when a cold air mass rises over a warm air mas. If you mean light rain then when a warm air mass rises over a warm air mass.
Heavy continuous rain is lots of rain coming down that lasts for a long time.
Not heavy rain but not light. its a storm that is monitored because it may become a thunderstorm.
A downpour.
vannary het
Sudden heavy rain is called a Cloud Burst of a Squall.
A brief rainfall, usually of variable intensity.
Light Shower or sprinkling.
drizzle is very light rain and well heavy rain, is well, heavy
Hurricanes produces very heavy rain, which is why flooding is a major concern when they hit.
year with out rain.
The light shines through the water
There is a lack of vegetation
A light snowfall might be called a dusting of snow.
Assuming the Q refers to rain, My usage would be that a shower is of short duration, whereas light rain may persist for some time. I fancy that these terms may have formal definitions in the profession of meteorology.