At least nine people died in Haiti and two were missing on Sunday, when heavy rainfall from Tropical Storm Laura buried large swaths of the country under murky floodwaters and threatened to overpower the country’s only hydroelectric dam.Laura was headed for a possible hit later in the week on the Louisiana coast as a hurricane, along with Hurricane Marco. But first, it was expected to make landfall Sunday evening somewhere between the provinces of Santiago de Cuba and Granma.“The waves are already spilling over the Gibara seawall. Many residents have already left the area for fear of flooding,…