CoCoRaHS - Community Collaborative Rain, Hail & Snow Network


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The current "Squall Line" automatically displays on your screen
after you enter your daily observation on the data screen.

The Squall Line (Disponible en anglais seulement)

CoCoRaHS Hail Week 2026

Previous CoCoRaHS "WxTalk Webinars" related to hail:

Graupel and Hail: What they are, how they form, and how they fall - presented by Andy Heymsfield, NCAR, Boulder, CO.
Educated Echoes: An Introduction to Doppler and Dual-polarization Weather Radar - presented by Pat Kennedy, CHILL Radar, Fort Collins, CO

Published research using CoCoRaHS hail data:

Analysis of the March 30, 2011 Hail Event at Shuttle Launch Pad 39A - 2012 - NASA Technical Report using CoCoRaHS Hail Pads at a NASA Shuttle Launch Pad.
Using Operational Radar to Identify Deep Hail Accumulations from Thunderstorms - 2019 - AMS Journal featuring CoCoRaHS hail reports used for analysis.
Sub-Severe and Severe Hail - 2022 - AMS Journal using CoCoRaHS data to research large and severe hail.
Hail hazard modeling for estimating roof damage - 2024 - Journal of Disaster and Risk Reduction using CoCoRaHS hail data.