Geomagnetic storms are the most damaging and costly space weather event, with impacts on power utilities, polar aircraft, GPS navigation and geolocation, and military defense systems. The National Oceanic and Atmospheric Administration (NOAA) requires solar wind measurements and coronal mass ejection (CME) imagery to warn of geomagnetic storms. Both requirements are currently met by research missions. NASA's Advanced Composition Explorer (ACE) returns realtime solar wind data. The NASA/ESA Solar and Heliospheric Observatory (SOHO) and NASA Solar Terrestrial Relations Observatory (STEREO) return CME imagery. NOAA is studying a variety of options for transitioning these research capabilities to operations.