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Types of precipitation include:
- Sleet (not present in Hong Kong)
- Snow (not present in Hong Kong)
- Warm air converges, rises up, expands to form uprising air currents.
- As warm air rises, it falls by 6 degrees Celsius per 1000 m. Relative humidity increase.
- At the condensation level, relative humidity reaches 100%, or due point. The air is said to be saturated.
- Excess water vapour condenses on condensation nuclei. Water droplets form.
- Water droplets accumulate to form clouds.
- When the clouds are too heavy to support, the droplets fall as rain.
- Sometimes accompanied by thunderstorms or lightning.
Three Types of Rain
For each of the following types of rain, warm air rises for different reasons.
- A cold front occurs when a warm air mass and a cold air mass meet.
- The warm air mass is forced up by the cold air mass.