This report analyzes the U.S. National Oceanic and Atmospheric Administration (NOAA) Storm Database to determine which severe weather events are most harmful to population health and which have the greatest economic consequences across the United States. The raw dataset spans from 1950 to November 2011. Population health impact is measured using total fatalities and injuries. Economic impact is measured using total property and crop damage. Damage exponent values were converted into numeric multipliers before calculating losses. Results show that tornadoes are the most harmful to population health, while floods create the greatest economic damage. These findings may help guide disaster planning and emergency resource allocation.