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Comments: Some retrospective runs from last year’s hurricane season, e.g. the landfalls of Hurricanes Claudette and Isabel, would have been useful to see if the physics changes had an impact on TC landfall predictions.
EMC Response: Most of the physics changes were dropped from the change package and we had done warm season testing early in the parallel testing period and saw no impact on tropical cyclone tracks or intensity.
Real-Time Parallel Runs:
Comments: For a small number of cases, no significant differences were apparent. TPC/NHC makes very limited use of the Eta model. We recommend implementation of the fall changes, unless there are objections from the other Centers or the Regions.