Hi

Rainfall also geographically known as precipitation is the process by which our mother earth cools it self and the living creatures living on her maintaining the earths temperature for survival of different species

It is the process where the local air becomes saturated with water vapors due to evaporation from the water bodies and others and it starts to precipitate when it can no longer able to maintain the water vapors in their gaseous stage and comes down as snow, hale and most commonly rain.

Geographically there are 3 types of rainfall:

Conventional rainfall: It is related to convectional currents. The air becomes light and rises up in convection currents when heated. On rising the air expands and the temperature drops forming cumulus clouds. Heavy rainfall and lighting occurs but does not lasts long. It is mostly seen in the equatorial regions

Orographic rainfall: mountains play a major role in this type of precipitation. Mountains forces the saturated air mass to rise. The rising air mass expands due to drop in temperature and the water vapors condense. The windward slope gets more rainfall in this type of precipitation. After the rainfall the air when reaches the other side the temperature increases thus increasing their ability to take in moisture and hence the leeward side does not recieve no or very less rainfall.

Cyclonic rainfall: As the name suggests this rainfalls the occurs along the fronts of cyclone. It is formed when two air masses of when density, humidity and temperature meet together. The layer which separates them is called the front, when the warm front rises, it gets cold and the vapors condenses forming cyclonic clouds. This type of rains can last upto few days

Based on intensity rainfalls are

Light rain: 0 to 2.5 millimeters

Moderate rain: 2.6 to 7.6 millimeters

Heavy rain: above and beyond 7.6 millimeters

Hope this helps

Hey Siddhartha,

Rainfall is the amount of precipitation that falls as rain (water from clouds) on the Earth's surface, whether on land or on sea. When air masses pass over warm water bodies or moist land surfaces, it forms.

Rainfall is basically classified into:-

• Orographic or relief rainfall ;- The saturated air mass is forced to ascend when it passes over a mountain. As the temperature drops, the rising air expands, causing the moisture to condense.
• Convectional rainfall;- The air heats up, causing lighter air to rise in convection currents. As the air rises, it expands, lowering the temperature and causing clouds to form owing to condensation. Rainstorms are accompanied by heavy showers, thunder, and lighting that last only a few minutes.
• Cyclonic or frontal rainfall;-  Cyclonic rain is caused by cyclonic activity and occurs along the cyclone's fronts. It is generated when two masses of air with different densities, temperatures, and humidity collide.

Also rainfalls which are based on intensities are known as:-

• Light rain – Rate of rain varies between 0 to 2.5 millimeters.
• Moderate rain – Rate of rain varies between 2.6 millimeters to 7.6 millimeters.
• Heavy rain – Rate of rain is beyond 7.6 millimeters.

Hope it helps...!!!

Regards.

Rainfall is mainly divided into three types:

1. Convectional rainfall: The air heats & the lighter air rises up in convection currents, now as the air rises it expands and temperature drops and clouds fall due to condensation, rains are accompanied with heavy shower and thunder & lightning that don't last long.

2. Orographic or relief rainfall: When the saturated air mass comes across a mountain, it is forced to rise. The rising air expands, eventually, the temperature falls, and the moisture gets condensed.

3. Cyclonic or frontal rainfall: Cyclonic activity causes cyclonic rain and it occurs along the fronts of the cyclone. When two masses of air of unlike density, temperature, and humidity meet then it is formed.

Hope, it helps!