POSTED: Thursday, August 30, 2012 - 10:00am
UPDATED: Thursday, August 30, 2012 - 10:04am
NBC NATIONAL NEWS — Entire communities are waking up under water this morning to face another day of Isaac.
Rooftops are all that's visible in parts of southern Louisiana, and in Mississippi roads have turned to rivers.
Hundreds are now staying in shelters.
The slow moving Isaac may not have had the strength of Hurricane Katrina, but it is still leaving thousands in despair.
The National Guard had to rescue dozens stranded in top floors of their homes after a wall of water toppled over the 18-mile levee protecting Plaquemines Parish.
The federal levees repaired following Katrina have done their job, sparing much of new orleans significant flooding.
Still, metro New Orleans sits littered by downed street lights, fallen trees and debri from mangled buildings.
Isaac also knocked out transformers leaving at least 60 percent of the city without power.