IMPORTANT: Entering the CHS webtool requests users to register an account. If a certificate is found on your computer, whether a DoD CAC or Microsoft certificate, the website will request you login with this information. Users with a DoD CAC may use their certificate in the popup to proceed to the login page. Non-DoD users should click 'Cancel' on the certificate popup to access the webtool.

The Coastal Hazards System (CHS) is a national coastal storm hazard data resource for probabilistic coastal hazard assessment (PCHA) results and statistics, storing numerical and probabilistic modeling results including storm surge, astronomical tide, waves, currents, and wind. CHS is an up-to-date and easily accessible environment for development, storage, and rapid access to PCHA hazard results, additional information such as tides, wind and rainfall, and documentation of the results. Based on high-resolution numerical modeling of coastal storms spanning practical probability and forcing-parameters, PCHA results directly support probabilistic design or risk assessment.