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^ Add a flag in HydroBase that can be viewed through TSTooI that designates when <br />calculated monthly average temperature and total precipitation values are based off of <br />missing daily data (1 to 9 days within a particular month). Note that NOAA uses a <br />designation of "X" to flag these cases. <br />Add an option to calculate frost dates from daily minimum temperature data, using the <br />NOAA criteria of June 30 as the last spring date and July 1 as the first fall date. The last <br />spring and first fall dates could beuser-specified variables, with the default set to the <br />NOAA criteria. Auser-specified number of sequential missing daily data should be <br />allowed in a given month. When missing data are encountered, the algorithm should <br />continue looking if auser-specified number of surrounding days are not less than 28/32 <br />degrees Fahrenheit. This enhancement would reduce the need for supplemental data files <br />containing frost dates calculated from regressed daily minimum temperature data, as used <br />in this task. <br />Currently the State loads climate data from the past two years into HydroBase. NOAA <br />climate data is constantly under review and changes are periodically made to improve <br />available data. Due to these periodic updates of NOAA climate data throughout the <br />SPDSS study period, we recommend a full refresh of all climate data every five years. <br />^ Check the stations that are downloaded from NOAA to ensure that any new stations are <br />added to HydroBase (e.g. Estes Park 1 SSE (2761) installed in 2001). <br />Comments and Concerns <br />The selected study period is 1950 through the most current year available. The TSTooI input <br />command files were provided for the period of 1950 through 2003, the most recent data available <br />at this time. In the future, these command files can be modified to include additional years of <br />data as it becomes available. As more data become available, the results from filling missing <br />data through regression may change slightly, however it is unlikely to significantly affect the <br />correlations and filled results. <br />Where to find more information <br />^ The South Platte Decision Support System Feasibility Study Final Report, October 2001 <br />is available on the State's website (http://cdss.state.co.us). <br />^ The Task 53.4 -Distribution of Climate Station memo provides additional information <br />on the spatial coverage of the climate stations. <br />Task 53_2.doc 17 of 17 <br />