Isaac weakens to tropical storm
Isaac, a vast storm that tore through southeastern Louisiana on the anniversary of Hurricane Katrina, weakened from a hurricane to a tropical storm after pushing floodwaters over a levee in marshy Plaquemines Parish and forcing the dramatic rescue of dozens of stranded residents.
ISAAC has reached hurricane strength with maximum wind speeds of 120km/h) as it bears down on the northern US Gulf Coast, the National Hurricane Centre has said.