The Latest on Tropical Storm Gordon on Monday (all times local):

11 a.m.

A hurricane watch has been issued for portions of the central U.S. Gulf Coast as Tropical Storm Gordon approaches.

The storm was lashing South Florida on Monday with high winds and heavy rains as it moved west-northwest at 16 mph (26 kph). The storm was expected to reach coastal Mississippi and Louisiana by late Tuesday and move inland over the lower Mississippi Valley on Wednesday.

The National Hurricane Center in Miami said in its 11 a.m. EDT advisory that the storm was centered 60 miles (95 kilometers) west-northwest of Key Largo and 50 miles (80 kilometers) south-southeast of Marco Island.

A hurricane watch - meaning that hurricane conditions are possible - was put into effect for the area stretching from the mouth of the Pearl River in Mississippi to the Alabama-Florida border.

A storm surge warning has been issued from Shell Beach, Louisiana, to the Mississippi-Alabama border.

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9:30 a.m.

Residents in parts of South Florida, Mississippi, and Louisiana are being warned to prepare for tropical storm-force winds with the onset of Tropical Storm Gordon. Isolated tornadoes are possible.

The National Weather Service said Monday that Naples, Marco Island, and Everglades City in Florida were among the locations that could expect hazardous weather over the next 36 hours.

The storm is expected to cross from southwest Florida into the Gulf Coast later Monday afternoon.

Flooding was also a high risk for the areas affected by the storm, including portions of southeast Louisiana north of Interstate 10 and southwest Mississippi west of Interstate 55.

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Weather forecasters have issued storm warnings for portions of South Florida and the Florida Keys.

The National Hurricane Center in Miami said Monday that Tropical Storm Gordon is likely to batter the region with heavy rains. A Storm Surge Watch is in effect for a portion of the Mississippi-Alabama border.

The center said in its 8:30 a.m. EDT advisory that the storm was centered 20 miles (30 kilometers) west of Key Largo and 85 miles (135 kilometers) southeast of Marco Island.

The storm was moving west-northwest at 17 mph (28 kph). Maximum sustained winds were clocked at 45 mph (75 kph).