Many of the HYSPLIT-compatible forecast data files are available directly
from NOAA NCEP on a server called NOMADS (NOAA Operational Model Archive
and Distribution System) . NOMADS is located at:
https://nomads.ncep.noaa.gov/
We also have these data sets on our ftp server, ftp.arl.noaa.gov, in the /forecast directory. The ftp server may be accessed by a ftp client or by a web browser. 1) If you want to use a ftp client, Windows PC users may use WinSCP, FileZilla, etc. that support passive mode. MacOS and Linux users may use the ftp command. Connect your ftp client to ftp.arl.noaa.gov using anonymous and your email address for the username and password, respectively. Note if you are using multiple ftp connections, limit the number of concurrent connections equal to or less than two. Otherwise, your access to our ftp server may be blocked off. 2) If you are using a web browser, point it to
https://www.ready.noaa.gov/data/forecast.
HRRR 3 km (pressure)
The High Resolution Rapid Refresh (HRRR) model contains pressure level forecast data every hour from forecast
hours 0 to 18 on a 3 km 1799 x 1059 grid covering the United States
and Southern Canada. Domain map of HRRR 3 km.
The High Resolution Rapid Refresh (HRRR) model contains sigma level forecast data every hour from forecast
hours 0 to 18 on a 3 km 1799 x 1059 grid covering the United States
and Southern Canada.
At forecast hour 0, the data are a 1-hour forecast from the previous cycle.
Domain map of HRRR 3 km.
The NAM model 3 km CONUS nest contains pressure-sigma hybrid level forecast data
every hour from forecast hours 0 to 48 on a 3 km 1792 x 1059 grid covering the United States. There
are eight files per cycle with each one containing 6 hours of forecast data. Domain map of NAM CONUS Nest.
The NAM model contain pressure-sigma hybrid level forecast data every hour from forecast
hours 0 to 48 on a 12 km 461 x 401 grid covering the continental United States.
The NAM model contains pressure level forecast data every 3 hours from forecast
hours 0 to 84 on a 12 km 614 x 428 grid covering the United States
and Southern Canada. Domain map of NAM 12 km.
NAM 1 km Fire Weather Nest (sigma-pressure hybrid)
The NAM model 1 km nest for fire weather events contain pressure-sigma hybrid level forecast data
every hour from forecast hours 0 to 36 on a 1 km 356 x 356 grid that can vary with each model run. Current NAM Fire Weather Domains.
The NAM model Hawaii 2.5 km contain pressure-sigma hybrid level forecast data every hour from forecast
hours 0 to 48 on a 2.5 km 321 x 225 grid covering the Hawaii region. Domain map of NAM 2.5 km Hawaii grid.
The NAM model Alaska 12 km contain pressure-sigma hybrid level forecast data every hour from forecast
hours 0 to 48 on a 12 km 387 x 276 grid covering the Alaska region. Domain map of NAM 12 km Alaska grid.
The Global Forecasting System (GFS) one-degree latitude-longitude grid contains forecast data every 3
hours from forecast hours 0 to 240 covering the globe.
The model data is updated 4 times per day.
The Global Forecasting System or GFSlr (we sometimes denote this very long forecast GFS dataset with lr) contains
forecast data every 6 hours from forecast hours 240 to 384 on a 1.0 degree latitude/longitude grid
covering the globe.
The Global Forecasting System (GFS) quarter-degree latitude-longitude grid contains sigma-pressure hybrid level forecast model
output every 3 hours from forecast hours 0 to 84 covering the globe (each file contains 8 time periods or 1 day).
The High Resolution Ensemble Forecast model contains 10 members' pressure-level forecast data every hour from forecast hours 1 to 30. Six members from HIRESW and two members from HRRR are on a ~5 km 1031 x 596 grid covering the continental U.S. The remaining two members from NAM are on a ~3 km 1792 x 1059 grid. Domain map of HREF 5 km.
The Global Ensemble Forecast System model contains 31 members' pressure-level forecast data every three hours from forecast hours 0 to 84 on a global half-degree latitude by longitude 720 x 361 grid. Domain map of GEFS.