In this report I present an analysis of the most adverse weather events in the United States between 1950-2011 using the U.S. National Oceanic and Atmospheric Administration’s (NOAA) storm database. Specifically, the data analysis shed lights on (1) the most harmful weather events with respect to population health, and (2) events with the greatest economic consequence. This analysis is conducted using R GNU and this report is written in R markdown language and compiled/generated using knitr.