NEW : Leogane continues to be one of the hardest - hit cities . Reports tell of destroyed houses , downed trees and flooded rivers . Aid workers are already struggling to keep up with a cholera outbreak . It could dump 15 inches of rain over Haiti and cause severe flooding and damage .
NEW : Leogane appears to be one of the hardest-hit cities . Reports tell of destroyed houses , downed trees and flooded rivers . Aid workers are already struggling to keep up with a cholera outbreak . Tomas could dump 15 inches of rain over Haiti and cause flash flooding and mudslides .