1) Precipitation occurs when water vapor in the atmosphere condenses into either liquid or solid forms.
Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth.
2) The rain shadow area of the mountains receives very little rainfall from the left over moisture in the clouds. Because most of the rain fall takes place in the windward side. A rain shadow is a dry area on the leeward side of a mountainous area (away from the wind). ... The air, without much moisture left, advances across the mountains creating a drier side called the "rain shadow".
3) Orographic rainfall occurs in most of the parts in the world. Orographic rainfall is caused when masses of air pushed by wind are forced up the side of elevated land formations, such as large mountains.
4) If condensation become close to earth's surface then rain occurs. Based on the sources for the uplifting of the air, there are three main types of rainfall.
1. Convectional rainfall, 2. Cyclonic rainfall and 3.Orographic rainfall
5) The precautions while measuring the rainfall with rain gauge are: The rain gauge should be placed on open place so that water from trees or pipes do not get into water. A gauge should be unprotected from the elements in all directions, it should be kept clean inside, and it should be emptied every day at the same time.
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