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<br /> 0 SO 100 lS0 200 2SCb <br /> 2S0 l() <br /> N <br />c .92 <br />0 r = <br />.+:; y = .87X - 3 <br />co <br />.~ 0 <br />Q. 200 0 <br />'0 N <br />Q) <br />'- <br />a.... <br />"0 <br />Q) <br />> <br />'- <br />Q) 0 <br />(/) 1S0 * l() <br />..a <br />0 <br />0> * <br />c <br />'(j) <br />:J <br />~ 0 <br />co 100 0 <br />Q) *** <br />a.... <br />3: * <br />0 <br />::;::: <br />c * <br />"0 0 <br />Q) 50 * <br />t3 l() <br />"0 <br />Q) <br />'- <br />a.... <br /> 0 0 <br /> 0 SO 100 1S0 200 250 <br /> Predicted Inflow Peak Using Orographic QPF Model <br /> <br /> <br /> <br /> <br />Figure 7. - Scatterplot of predicted inflow peaks to Folsom Reservoir using both orographic precipitation model estimates <br />and observed mean precipitation. <br /> <br />2.7 Prognostic Gridded Field Data <br /> <br />Following the completion of the QPF study for the ARB based upon historic data, <br />arrangements were made with the NWS to obtain prognostic gridded field data from the <br />NMC (National Meteorological Center) via the NWS office at SLC (Salt Lake City). Data <br />were available for four different models. A program was written by Tim Barker of the NWS's <br />Scientific Services Division at SLC to extract 77 NGM (Nested Grid Model) and Eta (Greek <br />letter - LFM replacement) model grid points, and 45 AVN (AViatioN) and MRF (Medium <br />Range Forecast) model grid points. These data were converted to ASCII and stored for <br />retrieval by the CNRFC in Sacramento over INTERNET. Dr. Owen Rhea then wrote <br />FORTRAN programs to use a Data General UNIX workstation to read these gridded field <br />data files. <br /> <br />The NGM and Eta model data are available for the initial time and for 6-h periods out to <br />48 h into the future. The 77 grid points selected for the NGM and Eta model data are spaced <br />about 80 km apart in the north-south direction, and 160 km apart in the east-west direction <br /> <br />17 <br />