This NOAA satellite image taken Tuesday, Sept. 6, 2011 at...

This NOAA satellite image taken Tuesday, Sept. 6, 2011 at 1:45 p.m. EDT shows Hurricane Katia in the Atlantic Ocean, about 365 miles SSW of Bermuda. Credit: AP

Hurricane Katia is a little weaker but still a Category 3 storm as it moves over the open Atlantic after briefly becoming a Category 4 system.

The U.S. National Hurricane Center in Miami says Katia's maximum sustained winds Tuesday were 115 mph (185 kph). The hurricane center says some fluctuation in strength is possible over the next 24 hours followed by slow weakening.

Forecast maps show Katia veering to the northeast away from the U.S. mainland in the coming week.

But the hurricane center says large swells could affect the East Coast, Bermuda, the Greater Antilles and parts of the Bahamas over the next few days.

Katia is centered about 365 miles (590 kilometers) south-southwest of Bermuda and moving northwest at 9 mph (15 kph).

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