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National Weather Service |
Access, analyze, and prepare the historical hydrometeorological data inputs. Input time series of snowpack, precipitation, temperature, and potential evaporation data to be used in the generation of hydrologic forecasts for the selected time period.
As a part of the extended-range hydrologic forecast process, the hydrologist must obtain and analyze historical hydrometeorological data from various sources and adjust questionable or erroneous data. The hydrologist must also use the refined historical data to create input time series of snowpack, precipitation, temperature, potential evaporation and streamflow. These time series should be consistent with the capability of the hydrologic model to accurately simulate actual physical processes at both the temporal and spatial scale. The accuracy of current model states should be verified.
1. Know different sources of historical hydrometeorological data and how to access and obtain that data, including the use of the Historical Data Browser.
2. Know how to select point/gridded data to accurately represent actual physical processes occurring in the basin.
3. Quality control historical hydrometeorological data (temperature, precipitation, snowpack, flow, potential evaporation) using station history information to correct for change in station location and to correct or eliminate bad station data. Use tools such as the Interactive Double Mass Analysis to determine data inconsistencies and produce corrections that will yield consistent historical time series without masking actual climatic variations.
4. Use existing tools such as TAPLOT, PXPP, MAP, MAT, MAPE and MAPX to develop input time series from historical point time series to use in hydrologic models.
5. Know location and storage format of time series data as well as appropriate editing tools.
Instructional Component 2.1: - Multiple Formats: PCU #2, Model Calibration and Hydrologic Procedure Development PDS: Access and Analyze the Historical Hydrometeorological Inputs. Workshops, documentation, and other instructional components in this PCU provide training on how to access and prepare historical time series data using tools such as the Historical Data Browser and the Interactive Double Mass Analysis tool.
Instructional Component 2.2: - Multiple Formats: PCU #3, Model Calibration and Hydrologic Procedure Development PDS: Produce Historical Input Time Series for Hydrologic Models. Workshops, documentation, and other instructional components in this PCU provide training on how to use historical data preprocessor tools to prepare input time series that can be used to calibrate hydrologic models.
Instructional Component 2.3: - Web Module (Proposed): Climatological Adjustments to ESP Input Time Series. This module will describe how to use the preadjust technique which gives extra weight to historical time series in the forecast window from years which were similar to the regime anticipated in Climate Prediction Center (CPC) extended-range outlooks.
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