Of the following, which is accurate regarding turbulence associated with thunderstorms?

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Refer to the excerpt from the following METAR report: KTUS 08004KT 4SM HZ 26/04 A2995 RMK RAE36 At approximately what altitude AGL should bases of convective-type cumuliform clouds be expected?

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Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?

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