An extract refers to the process of obtaining data from a CWMS database, an HEC- DSS file, CUMULUS, CWMS-Data-API (formerly CWMS RADAR), 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 HEC-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 HEC-DSS records can contain both gridded data and time series data.