1 Introduction Interest in Early Warning The Precautionary Principle as an Early Warning The Future Has Arrived Earlier Than Predicted What Constitutes an Early Warning System? Threats Strengths, Weaknesses, Opportunities and Constraints Assessment Perception of the Role of EWSs The Reality of the Role of EWSs Surprises Early Warning System FAQs Forecast Warning Terminology Geographic Information Systems 2 Climate, Water and Weather Related Hazards Hurricanes Severe Winter Storms Superstorm '93: North America and the Caribbean Are Seasons of Superstorms a Possibility? Heat Waves European Heat Wave 2003 Tornadoes Nor'easters El NiSo-Southern Oscillation Vector-Borne Disease Severe Weather Fire Danger Index Anatomy of Australian Bush Fires Air Pollution in Metropolitan Areas Dust and Sandstorm Early Warning 3 Too Much, Too Little Floods China's 1998 Great Yangtze River Floods Flash Floods Thunderstorms Drought NOAA's Palmer Drought Severity Index Drought in Africa Australia Monitoring for Drought Early Warning Drought in Latin America 4 Global Warming Global Warming The Polar Regions: A "plate" as an Early Warning about Global Warming Coral Reef Bleaching Sea-Level Rise Integrated Vector Management 5 Earth Hazards Tsunamis Indian Ocean Tsunami 2004 Volcano Early Warning Systems Space Weather U.S. Ultraviolet Forecasts 6 Concluding Thoughts Foreseeability of Hazards Lessons Learned about "Lessons Learned", References Essential References for Early Warning Systems