This analysis uses the NOAA Storm Database (1950–2011) to identify which severe weather events in the United States are most harmful to population health and which cause the greatest economic losses. Data were loaded directly from the raw CSV file, cleaned, and transformed to compute total fatalities, injuries, and property/crop damage in USD. Tornadoes are shown to have the highest combined health impact, while floods and hurricanes result in the largest economic losses. The analysis includes reproducible R code, aggregation tables, and figures summarizing these impacts.