The remnants of Hurricane Isaac dumped rain across drought-stricken parts of the lower US Midwest on Saturday after the storm killed at least 30 people on its trek across the Caribbean and Louisiana and Mississippi, authorities said.

Rainfall between 3 to 5 inches (7.6-12.7 cm), and up to 8 inches (20 cm) in some areas, was expected to blanket much of the middle Mississippi River Valley and Ohio River Valley on Saturday and Sunday, US forecasters said.

But Dan Peterson, a forecaster at the National Weather Services' Hydrometeorological Prediction Center in College Park, Maryland, said flash flooding was not expected to pose much of a problem.

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