National Integrated Drought Information System (NIDIS), initialy focused on drought early warning in the USA and worked collaboration with diffrent governemtal agencies on drought related issues. But at this time, it works at global scale and focuse on global drought information system and working with diffrent partner organization within and out of USA. For example, North America Drought Monitoring (NADM), Joint Research Center (JRC) in EU, African Flood and Drought Monitoring, and Australian Government.
WEbsite: http://www.drought.gov/drought/