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      Karen threatens US during quiet hurricane season

      Though weakening slightly, Tropical Storm Karen remains poised to become the first named storm to hit the U.S. in what has been a relatively quiet hurricane season.

      National Hurricane Center forecasters expect Karen to be near the central Gulf Coast on Saturday, likely as a weak hurricane or tropical storm.

      Karen is about 250 miles (405 kilometers) south-southwest of the mouth of the Mississippi River and 290 miles (465 kilometers) south-southeast of Morgan City, La. It's moving north-northwest at 10 mph (17 kph). Maximum sustained winds are 50 mph (85 kph).

      A hurricane watch is in effect for Grand Isle, La., to west of Destin, Fla. A tropical storm warning is in effect for Morgan City, La., to the mouth of the Pearl River.

      Karen is expected to produce rainfall of 3 to 6 inches through Sunday night, with isolated totals up to 10 inches possible.