NHC: Isaac is on the verge of becoming hurricane

Tropical Storm Isaac was on the verge of becoming a hurricane, with significant storm surge and flood threat from rainfall expected along the northern Gulf coast, the US National Hurricane Center said on Tuesday.
The storm was located about 205 miles (330 km) south-east of the mouth of the Mississippi River, with maximum sustained winds of 70 miles per hour (110 kmph), the NHC said.
Isaac was moving toward the northwest at a speed of near 12 mph (19 kmph).
Once ashore, the storm could wreak havoc on low-lying fuel refineries along the Gulf Coast that account for about 40 percent of US refining capacity.