From the horses mouth:
nesdis.noaa.gov

The president’s FY 2011 budget request reflects the recent White House decision to improve federal management for the nation’s next generation of polar orbiting satellite by restructuring the management of the program. The FY 2011 budget includes $1.1 billion in the NOAA budget for NOAA’s portion of the program, the new Joint Polar Satellite System (JPSS).

That $1.1 is what has been cut by the repubs.