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Raindrops, which leave the warmer air, encounter the colder air below.When a layer of air with the temperature above freezing point overlies a subfreezing layer near the ground, precipitation takes place in the form of sleet. Sleet is frozen raindrops and refrozen melted snow-water.Besides rain and snow, other forms of precipitation are sleet and hail (more about hail while studying thunderstorms), though the latter are limited in occurrence and are sporadic in both time and space. Moisture is released in the form of hexagonal crystals. When the temperature is lower than the 0° C, precipitation takes place in the form of fine flakes of snow and is called snowfall.Drizzle is light rainfall with drop size being less than 0.5 mm, and when evaporation occurs before reaching the ground, it is referred to as.It is called virage when raindrops evaporate before reaching the earth while passing through dry air.Precipitation in the form of drops of water is called rainfall, when the drop size is more than 5 mm.Considerable part of this precipitation gets evaporated back to the atmosphere.Precipitation results when water droplets come together and coalesce to form larger drops that can drop down.Wind speed facilitates movement of clouds while its turbulence retains water droplets in suspension.The nuclei are usually salt particles or products of combustion and are normally available in plenty.Under proper weather conditions, water vapour condenses over nuclei to form tiny water droplets of sizes less than 0.1 mm in dia.When dry air with a temperature well below freezing comes in contact with ice, molecules of ice (H 2O) pass directly into the vapour state by the processes of sublimation.
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At temperatures below freezing, water may bypass the liquid form in its change of state.When this happens, the latent heat of vaporisation, in this process, called the latent heat of condensation is released.Part of the water vapour then condenses into liquid form on the cool surface, produce dew.When moist air comes in contact with cool surfaces, it may be cooled to the point where its capacity to hold water vapour is exceeded by the actual amount in the air.Change of state from water vapour to liquid water is.An isohyet is a line connecting points with equal values of rainfall.In the same way that isotherms and isobars are used to show temperature and pressure distribution respectively, isohyets indicate rainfall distribution.It always precedes condensation or sublimation or a combination of the two and is primarily associated with raising air.Precipitation is water in liquid or solid forms, falling to the earth.