NOAA Air Resources Laboratory

HYSPLIT4 Information

Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) Model

Registration Instructions



  • HYSPLIT registration is ONLY required to use HYSPLIT on the web with forecast meteorological data, the gaussian plume model, or to download the registered version of HYSPLIT for the PC and Apple. Please do not register if you will only be using archive data with HYSPLIT (i.e., no forecast data), instead use the following link to access the archive HYSPLIT webpage....

  • To become a registered HYSPLIT user you must have a formal affiliation with one of the following institutions engaged in atmospheric sciences or in the provision of atmospheric operational products, and whose credentials we can verify: government, commercial, eductional, or non-profit.



  • Forgot your password or your login fails? Send an email to arl.webmaster@noaa.gov

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