HailAlmanac

Data sources

Every figure on this site comes from these public files. Each download is checked against a schema, and the pipeline stops if a file shrinks or its newest date goes backwards.

SourceRecordsLast checkedRefresh
NOAA NCEI Storm Events Database, hail reports, 1955–2026 (72 yearly files)424,439Oct 26, 2026Checked daily; NOAA republishes a year's file when it adds or corrects reports. Final record through Jun 30, 2026.
NWS Local Storm Reports (hail; 2026, preliminary), via the Iowa Environmental Mesonet, Iowa State University254Oct 26, 2026Daily, for dates after the final record; replaced by NCEI's record as it is published.
Census Bureau 2025 cartographic boundary file: metropolitan areas (OMB 2023 delineations)935Oct 26, 2026Yearly
Census Bureau 2025 cartographic boundary file: counties (1:500,000)3,235Oct 26, 2026Yearly
Census Bureau 2025 cartographic boundary file: places (1:500,000)32,629Oct 26, 2026Yearly
Census Bureau 2025 Gazetteer: counties3,222Oct 26, 2026Yearly
Census Bureau 2025 Gazetteer: places (names, internal points, land area)32,350Oct 26, 2026Yearly
Census Bureau 2025 Gazetteer: ZIP code tabulation areas (to place ZIP codes in cities)33,791Oct 26, 2026Yearly
Census Bureau Vintage 2025 population estimates: cities and towns19,483Oct 26, 2026Yearly

Records for NCEI are hail reports nationwide in the files as published; the site uses those in and near Texas, Oklahoma and Colorado. Preliminary reports through Oct 26, 2026.

Credits

Hail records: NOAA National Centers for Environmental Information, Storm Events Database, compiled from National Weather Service Storm Data. Preliminary reports: National Weather Service Local Storm Reports, archived by the Iowa Environmental Mesonet at Iowa State University. NOAA and Iowa State University do not endorse this site or its use of their data.

This product uses U.S. Census Bureau data but is not endorsed or certified by the Census Bureau.

How these files become the numbers on each page is described in the methodology.