If you run a roofing or restoration company, you have probably paid for a hail map. The raw data behind most of them is public: the NOAA Storm Prediction Center (SPC) publishes a CSV of every hail, damaging-wind and tornado report for every day since 2004. The files are awkward to use directly: There is one file per day per hazard. Hail size is stored in hundredths of an inch ( 175 means 1.75"). An SPC "day" runs from 12:00 UTC to 11:59 UTC the next day, so a report logged at 01:00 ...