An extract refers to the process of obtaining data from a CWMS database, a DSS file, or a WISKI database (WISKI Extract and Post) and mapping that data to a model alternative's required input record. The extract retrieves the source data and copies the data into records stored in a centralized DSS file called the forecast.dss file. The forecast.dss file is then used to provide input data during the forecast compute process. Extracts from the CWMS database to DSS records can contain both gridded data and time series data.