The basic goal of this report is to explore the NOAA Storm Database and answer some basic questions about severe weather events. It is required to use any R package to support the analysis. The aim is to answer these two questions : 1.Across the United States, which types of events are most harmful with respect to population health? 2.Across the United States, which types of events have the greatest economic consequences? To do that, we will get the information from NOAA Storm Database from 1950 to 2011 in csv format and then we will process the data by using R.