how the possibility of rainfall depends on relative humidity?
Answers
The relative humidity of (moist) air decreases by sensible cooling & increases by sensible heating of air (if no water vapor is added to or removed from air).
When hot & humid air (not saturated) rises through the atmosphere its temperature decreases by about 1∘ C per 100m rise in altitude. Thus humid air gets cooled as it rises vertically through the atmosphere & thus a point reaches when temperature of humid air falls below its dew point temperature (at which condensation starts) thus surplus amount of water vapor starts condensing & drops falls in form of rain. This rain continues until the air becomes saturated by left amount of water vapor & rains stops. Thus the relative humidity of surrounding air is increases it means that the moisture holding capacity of air decreases due to rain in a particular region.
Answer:
The evaporation will cool the air and increase the absolute moisture content of the air locally. On a larger scale, rain will remove water vapor through air condensation and deposit it on the surface. This means that across larger volumes, the average relative humidity reduces through rain. ... Amount of rainfall.