To amend the Robert T. Stafford Disaster Relief and Emergency Assistance Act to direct the Administrator of the Federal Emergency Management Agency to modernize the integrated public alert and warning system of the United States, and for other purposes.

Integrated Public Alert and Warning System Modernization Act of 2009 - Amends the Robert T. Stafford Disaster Relief and Emergency Assistance Act to direct the President, acting through the Administrator of the Federal Emergency Management Agency (FEMA), to modernize and implement the integrated U.S. public alert and warning system to ensure that the President can alert governmental...