Forecast trajectories summarized above come from https://nomads.ncep.noaa.gov/pub/data/nccf/com/hysplit/prod/traj.YYYYMMDD.
The 6-h duration forward trajectories begin at
the specified number of hours after the start of the meteorological model initialization.
The trajectories are computed using
meteorological fields output from the NOAA
National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS)
forecast model. Details on the GFS gridded data used in these
calculations are available on the meteorological forecast data web page.
Trajectories starting at different heights are shown
in different colors. The trajectory endpoints are plotted on maps (gif), displayed
in text files (txt), and can be viewed in Google Earth.
These are not official forecasts for an eruption and do not show ash fall.
