HISTORICAL EVENT INTELLIGENCE · SEVERE CONVECTIVE STORM
Severe Convective Storm Data
Hail, damaging wind, and tornado in one connected event record — 165,000+ records with measured hail size, wind gusts, radar hail swaths, and surveyed tornado paths. Download a free sample or licence the archive.
One storm, several perils
A single convective system can drop hail in one corridor, tornadoes hundreds of miles apart, and damaging wind across a far larger area. The data keeps them distinct but connected.
Hail
Measured hail size per event, MRMS MESH radar swath polygons showing where the stones fell, and ground reports. Null where unmeasured — never zero-filled.
Damaging wind
Measured gusts where an anemometer caught them, plus damage-confirmed wind reports where the evidence is structural rather than instrumental.
Tornado
99.6% enhanced, with surveyed damage paths and EF ratings where the National Weather Service assigned them.
Why one page rather than three: for insurers and risk teams, severe convective storm is a single accumulating peril, not a filing cabinet. The industry's severe convective storm data problem is exactly that these hazards arrive together and get stored apart.
Start with a real sample
Two free bundles — no signup on either.
Hail — Texas, May 2025
Eight fully-enriched events across five storm days: 3.0–5.0″ hail, 222 ground-truth hail reports, and 263 MRMS MESH radar swath polygons with warning geometry.
Download the Texas hail sample →Tornado — Kansas, 2024
Eight surveyed tornado events from the April–May 2024 outbreak sequence, with ratings, footprints, and exposure in the same structure full datasets ship in.
Download the Kansas tornado sample →Go deeper by peril
Each peril has its own dataset page with field-level detail.
Tornado Data
106,000+ records since 2014 with EF ratings, footprints, and exposure — the deepest-enhanced peril in the archive.
Tornado Data →Live severe weather
What the feed is tracking right now — active severe thunderstorm and tornado activity worldwide.
Live tornado activity →Two ways to get it
The same severe convective storm records, served for history or for right now.
Historical datasets
Bulk extracts filtered to your geography, hail-size or EF threshold, and date range — CSV, GeoJSON, or NDJSON, by subscription or one-time purchase.
Historical Event Intelligence →Real-time severe weather API
Hail, wind, and tornado warnings and events as they are issued, with footprints and exposure — the live end of the same record structure.
Event Intelligence API →Severe Convective Storm Data — FAQ
Where can I download historical hail data?
A free hail dataset sample is available with no signup: eight fully-enriched Texas severe convective storm events from May 2025, with 3.0-5.0 inch hail across five storm days, 222 ground-truth hail reports, and 263 MRMS MESH radar swath polygons. Full historical hail datasets are licensed through Historical Event Intelligence, filtered to your geography and hail-size threshold.
Is hail data separate from tornado and wind data?
No, and that is deliberate. A single convective storm can produce hail, damaging wind, a tornado, and flash flooding in the same hours across different footprints. Our records keep those hazards distinct but connected, so you can query hail swaths, wind gusts, and tornado paths from the same storm rather than reconciling three unrelated datasets.
What measurements are actually in the data?
Measured hail size up to 6.1 inches and wind gusts up to 131 mph where an observation exists — and null where one does not. We do not zero-fill a missing measurement, because a zero would read as a calm reading rather than an absence. Severe convective storm records also carry MRMS MESH radar hail swath polygons, ground storm reports, and warning geometry; tornado records add surveyed damage paths with EF ratings.
Is there a severe weather API?
Yes — two. The Event Intelligence API streams severe thunderstorm and tornado warnings and events in real time with footprints and exposure, and Historical Event Intelligence serves the archive by query: by hail size, wind gust, EF rating, geography, or date range.
How far back does severe convective storm data go?
Tornado records run from 2014 with 99.6% carrying enhancement. Storm and severe weather records have contiguous coverage from 2007-2008, with measured hail and wind observations concentrated in the 2020s as radar and reporting networks densified. Detection density improves across the archive, so rising counts partly reflect better observation rather than more storms.