Tropical storm Hanna has caused flooding and landslides in the Caribbean nation of Haiti, killing 61 people and displacing tens of thousands. Tens of thousands were displaced on Wednesday from the third major storm in just a week to rip through the area causing deaths and devastation, officials said Wednesday. After hurricane Gustav, that killed 77 people, a new wave of seasonal hurricanes targets the US Gulf Coast. Two weeks before Gustav, tropical Storm Fay sparked flooding in Haiti that left about 40 people dead. Hanna packed maximum sustained winds of nearly 95 kilometers per hour, with higher gusts. "Gradual strengthening is expected ... and Hanna could become a hurricane tomorrow (Thursday)," the Miami-based National Hurricane Center said Wednesday. Hanna is expected to move to the southeastern Bahamas and the Turks and Caicos Islands over the next 24 to 36 hours. Two other storms were churning in the Atlantic.