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<br />. <br /> <br />The second forecast variabll~ is wind direction and speed at the 700 mb <br />and 500 mb levels. Thesl~ winds will affect the launch of constant <br />volume balloons and the SF6 trajectories in the seeding material deli- <br />very experiments. The winds will also determine the trajectories of <br />cloud and precipitation particles observed by the Doppler radars. Co- <br />ordination of the radars will thus depend on the wind forecasts. The <br />third forecast. variable is the vertical atmospheric temperature strati- <br />fication. This will affect conditions of stability, determine at what <br />density altitudes constant volume balloons may be set to float, and <br />affect the height of the me'lting level. Supplementing the forecasts of <br />these three variables will be current data on significant cloud cover, <br />wind velocities, and temperclture stratification. A skew T-Iog p plot of <br />the most recent Adamsville sClunding and NWS forecasts and information on <br /> <br /> <br />existing weather will be made part of the research program forecast when <br /> <br /> <br />practical. The forecast will be issued on a standard form. <br /> <br /> <br />Supplementing the forecasts issued at the two scheduled times will <br /> <br />be monitoring of the current weather. Because western Utah and the <br /> <br /> <br />upwind areas of Nevada are relatively data sparse, weather can develop <br /> <br />in these regions rather unexpectedly and soon affect the research area. <br /> <br />Close attention to the weather will be required in order not to miss <br /> <br /> <br />research opportu nities. <br /> <br /> <br />b. Meteorological observations. Meteorological observations will <br /> <br /> <br />be made at the Field Headquarters and at the NCAR C-band radar and <br /> <br /> <br />Merchant Valley remote sensing sites by personnel in charge at each <br /> <br /> <br />site. The observations will include wind, cloud cover, and precipita- <br /> <br /> <br />tion amounts and types. Observations will be made at least hourly <br /> <br /> <br />during STORMS but more often if the weather dictates. Calibrated <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />-24- <br /> <br />. <br />