Mon, Aug 27, 2012 1:10 PM EDT

On Monday, Louisiana Gov. Bobby Jindal called for residents in coastal parishes prone to flooding to voluntarily evacuate. The announcement came as tropical Storm Isaac continues west-northwestward over the eastern Gulf of Mexico and poses a significant storm surge threat to the northern Gulf coast. [Tropical storm Issac is expected to hit Louisiana ]( a strong category 1 hurricane with 75-90mph winds late Monday or early morning Tuesday. Gov. Scott (R) also [pulled out of convention activities due to the storm. ](