A forecast run is a single forecast scenario defined by a specific set of data, information, and model alternatives. You create forecast runs in the Setup module. You use the previously defined model alternative keys to create a forecast run key that consists of a collection of the model alternative keys.

As an example, you might name a forecast run MFP-HMS-ResSim. For this example, the forecast run key might be R0B0N0---- which could reflect Radar precipitation data for MFP, Base data for HEC-HMS, and Normal Operations for HEC-ResSim. In this example, the dashes indicate that HEC-RAS and HEC-FIA are not being run. Refer to Model Alternatives and Forecast Runs for additional information on forecast runs.