Ooh, my dad was a member of the RMS, so I can answer this
Quote:
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When rain is produced by the intermixture of different volumes of air the precipitated moisture usually assumes at first the form of small globules of vapor an assemblage of which in the higher regions of the atmosphere constitutes clouds As the process of condensation advances more moisture is precipitated and the globules uniting in rain drops descend to the earth Now it is supposed that at times the humidity of the atmosphere is condensed at once into rain without passing through the intermediate state of cloud and under these circumstances a shower might fall from a cloudless sky.
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Elements of Meteorology With Questions for Examinations By John Brocklesby