Data sources

StormSight is built on a foundation of free, government-provided weather data — the same data that powers every commercial hail-tracking product. Below is the complete list of inputs to the confidence-scoring algorithm. All public-domain US government data is used in accordance with the relevant NOAA/NWS licensing terms.

MRMS (Multi-Radar Multi-Sensor System)

NOAA / National Severe Storms Laboratory

Primary hail-size signal (MESH product) and live composite reflectivity

Free - public-domain US government data

NEXRAD Level II

NOAA / National Weather Service

Dual-polarization hail signature detection

Free - public-domain US government data

GOES-19 GLM (Geostationary Lightning Mapper)

NOAA / NASA

Lightning density and lightning-jump detection

Free - public-domain US government data

GOES-19 ABI (Advanced Baseline Imager)

NOAA / NASA

Cloud-top brightness temperature and overshooting-top detection

Free - public-domain US government data

NWS API (api.weather.gov)

National Weather Service

Active Severe Thunderstorm + Tornado warnings

Free - no auth required

Storm Prediction Center (SPC) Outlooks

National Weather Service

Days 1-8 categorical and probabilistic convective outlooks

Free - public-domain US government data

Iowa Environmental Mesonet (IEM)

Iowa State University

Local Storm Reports (LSRs) feed

Free - public dataset

NCEI Storm Events Database

NOAA / National Centers for Environmental Information

Ground-truth backtest data; quarterly calibration

Free - public-domain US government data

CoCoRaHS (Community Collaborative Rain Hail Snow)

Colorado State University / NOAA

Volunteer hail-pad measurements - highest-quality crowdsourced ground truth

Free for non-commercial; commercial license modest

mPING (Meteorological Phenomena Identification Near the Ground)

NSSL / University of Oklahoma

Crowdsourced hail reports via mobile app

Commercial license ~$500-1,500/year

Oklahoma Mesonet (Phase 3)

Oklahoma Climatological Survey

121-station surface observations for gust + cold-pool corroboration

Commercial license $4,000-10,000/year

County tax assessor parcels

Oklahoma county GIS portals

Affected-parcel lookup for canvassing lists

Free public records

Attribution: Data products from NOAA/NWS/NSSL are public-domain works of the United States government. Other licensed datasets carry their own attribution and use restrictions; StormSight complies with each. If you have questions about StormSight’s use of any data source, contact data@harness10.com.

Read the methodology →