A tornado warning has been issued in southern Mississippi as Hurricane Isaac hits Louisiana and Mississippi with high winds and drenching rains.

The National Weather Service says the tornado warning area Wednesday includes the cities of Long Beach and Gulfport, which are west of Biloxi on Mississippi's Gulf Coast.

The warning comes as Category 1 Isaac moves inland in Louisiana, bringing flooding and power outages after making landfall Tuesday evening.

The U.S. National Hurricane Center warns Isaac's dangerous storm surges and flooding threats from heavy rain are expected to last all day and into the night as it crawls over Louisiana.