This webpage includes the forecasting result for Volcano St. Helens tracers, yielded by MM5 meteorology and STEM
tracer model. Seven ash tracers are released from the location Mt. St. Helens at altitudes (above ground level)
below 500m, 500m-1km, 1-2km, 2-3km, 3-5km, 5-8 km and above 8km, respectively. The tracers do not
represent any realistic concentrations, but just show the relative plume strength under current weather
situation. In this website, you can also view time-series or cross-section plots over any model grid.
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