NOAA Storm Events Database

This dataset is available to the public and can be attained through csv bulk download. It has a tremendous amount of data for weather events in the United States. The specific fields available can vary based on the type of weather event. For tornado segments, the database includes begin datetime, end datetime, begin lat/lon, end lat/lon, EF value, tornado width, etc.  https://www.ncdc.noaa.gov/swdi/#Intro