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MIAMI (CBSMiami) — Heavy rain has caused the National Weather Service in Miami to expand a flood watch to include parts of South Florida.

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Portions of South Florida, including coastal Collier, inland Collier, and mainland Monroe are urged to take precaution.

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Showers and thunderstorms with periods of heavy rain are expected Saturday afternoon and night, which may lead to flooding. Rainfall totals of 2 to 4 inches will be common, with excess amounts of up to 6 inches possible.

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The flood watch extends until 4 a.m. Sunday.