Harmful Algal Bloom and Hypoxia Amendments Act of 2003

Harmful Algal Bloom and Hypoxia Amendments Act of 2003 - Amends the Harmful Algal Bloom and Hypoxia Research and Control Act of 1998 to repeal the President's authority to disestablish the Interagency Task Force.Requires the President, in conjunction with the chief executive officers of the States, to develop and submit to Congress a Prediction and Response Plan to protect environmental and public health from impacts of harmful algal blooms.Specifies plan, publication and Federal assistance requirements.Requires the Secretary of Commerce, in coordination with the Task Force, to provide for local and regional assessments of hypoxia and harmful algal blooms, as requested by coastal States, Indian tribes, and local governments. Provides guidelines for local and regional assessments.