In an NBC News special report, President Obama stresses the importance of abiding by evacuation orders from local officials, warning that Sandy is a "serious storm" that could have "fatal consequences" if people don't act accordingly. (NBC News)
FEMA administrator Craig Fugate talks to TODAY's Matt Lauer about preparations along the Gulf Coast for landfall of Tropical Storm Isaac, which forecasters say could gather enough strength to become a category 2 hurricane. (TODAY)
Lee County, Fla., is under a mandatory evacuation order as Tropical Storm Isaac approaches the Gulf with the possibility of dangerous storm surge along Southwest Florida's coast. NBC's Thanh Truong reports. (msnbc)
Crews are working to contain an ammonia leak at the San Onofre nuclear plant in San Diego. A spokesman for the plant says there was no radiation leak and no one was injured. NBC's George Lewis reports.
Japan expanded the evacuation zone around its crippled nuclear plant because of high levels of accumulated radiation. NBC's Charles Hadlock reports on this and the magnitude 6.6 aftershock that rattled the area Monday. (msnbc tv)
Documentary producer Julienne Gage describes her experience of being evacuated from the Discovery Communications building in Silver Springs, Md., where a gunman has entered and has taken at least one person hostage.