Hurricane Irma strengthens in Atlantic, threat to US still uncertain

The hurricane is already a Category 3 storm and is moving toward the Caribbean.

— -- A new storm is strengthening in the Atlantic Ocean even as much of the southern United States continues to deal with the lingering effects of Hurricane Harvey.

Hurricane Irma is officially a Category 3 storm as of Thursday evening, and it is expected to continue to strengthen as it moves west-northwest at 12 mph. It currently has maximum sustained winds of 115 mph, according to the National Weather Service.

It doesn't currently pose a threat to land, and it's too early to say exactly what track the storm will take.

Irma is expected to become a Category 4 storm by Monday.