The National Climatic Data Center (NCDC) is a service of NOAA, the National Oceanic and Atmospheric Administration. The NCDC is responsible for preserving, monitoring, assessing, and providing public access to climate and historical weather data.
The Severe Weather Data Inventory (SWDI) is a dataset of severe weather records for the U.S. The database integrates records from a variety of NCDC sources. The SWDI API provides programmatic access to the database. The API is able to specify a dataset and date range, and filter results using a variety of parameters.