Gordian Knot News β’ 95 implied HN points β’ 12 Mar 26
- The NRC should replace the MACCS2 Gaussian plume model with NOAAβs HYSPLIT Lagrangian puff model to get more realistic plume predictions.
- Puff models track many individual parcels and use time-varying winds and precipitation, so they can capture rain washout and shifting plumes that Gaussian fixed-wind models cannot.
- Using HYSPLIT would enable more accurate, forecast-driven dose predictions and support harm models that care about dose rate, and integration work (e.g., Sandiaβs merge) shows this is feasible.