O

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O is for Oscar, like the man who goes overboard

-Ordinary cell thunderstorms (air mass thunderstorms) – a thunderstorm produced by local convection within a conditionally unstable air mass often forming in a region of low wind shear; it usually does not reach the intensity of a severe thunderstorm

-Oscar - in flag signals it means "man overboard"

-Outflow boundary – a surface boundary formed by the horizontal spreading of cool air that has originated inside of a thunderstorm