From the Homeland security web site:
Emergencies & Disasters
Preparing America
In the event of a terrorist attack, natural disaster or other large-scale emergency, the Department of Homeland Security will assume primary responsibility on March 1st for ensuring that emergency response professionals are prepared for any situation. This will entail providing a coordinated, comprehensive federal response to any large-scale crisis and mounting a swift and effective recovery effort. The new Department will also prioritize the important issue of citizen preparedness. Educating America's families on how best to prepare their homes for a disaster and tips for citizens on how to respond in a crisis will be given special attention at DHS.
FEMA powers:
Here are some of the actions FEMA can take in emergency situations, as authorized by Presidential executive orders:
* allows the government to take over all modes of transportation and control of highways and seaports.
* allows the government to seize and control the communication media.
* allows the government to take over all electrical power, gas, petroleum, fuels and minerals.
* allows the government to take over all food resources and farms.
* allows the government to mobilize civilians into work brigades under government supervision.
* allows the government to take over all health, education and welfare functions.
* allows to designates the Postmaster General to operate a national registration of all persons.
* allows the government to take over all airports and aircraft, including commercial aircraft.
* allows the Housing and Finance Authority to relocate communities, build new housing with public funds, designate areas to be abandoned if contaminated beyond reasonable means of decontamination, and establish new locations for populations.
* allows the government to take over railroads, inland waterways and public storage facilities.
* allows them to specify the responsibility of the Office of Emergency Planning and gives authorization to put all Executive Orders into effect in times of increased international tensions and economic or financial crisis.
* allows them to grant authority to the Department of Justice to enforce the plans set out in Executive Orders, to institute industrial support, to establish judicial and legislative liaison, to control all aliens, to operate penal and correctional institutions, and to advise and assist the President.
* allows them to assign emergency preparedness function to federal departments and agencies, consolidating 21 operative Executive Orders issued over a fifteen year period.
* allows the Federal Emergency Preparedness Agency to develop plans to establish control over the mechanisms of production and distribution, of energy sources, wages, salaries, credit and the flow of money in U.S. financial institution in any undefined national emergency. It also provides that when a state of emergency is declared by the President, Congress cannot review the action for six months. The Federal Emergency Management Agency has broad powers in every aspect of the nation.