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Why can it be raining in one spot and not be just a few feet away?

Most convective showers are small - only a couple miles in diameter while some large thunderstorms may be up to 10 miles across. Most showers and thunderstorms develop in large complexes or lines so it seems like there is a large continuous area of rain but these are actually made up of many individual showers or thunderstorms. Each convective shower has an updraft where warm moist air rises up. The rising air cools and the moisture condenses out forming cloud droplets and eventually rain. Rain falls in the down draft. The area of falling rain may be small. The rain generally does not fall in the updraft portion and there may be a sharp cutoff from no rain to rain.


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