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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1 hour after the seeded precipitation has passed. In addition to the instru- <br />ments used previously a second 2D-C cloud probe, on loan from the Montrose <br />Skywater office, will be available. This second probe will be primarily <br />operated at the downwind site during aircraft seeding operations, but will <br />remain mobile and also used as outlined below. <br /> <br />Operation of the radiometer and collection of the ground microphysics obser- <br />vations at Kingvale will be accomplished by a two-man crew this year. To <br />facilitate this the tape drive and data aquisition unit for the 2D-C cloud <br />probe will be included in the radiometer trailer. Also to insure that no <br />opportunities are missed the Kingvale site will be staffed by one person at <br />the first sign of weather. The second man will be dispatched for impending <br />operatlons. For collection of the precipitation data four observational tech- <br />niques will be employed. <br /> <br />a. A ground-based PMS (Particle Measuring Systems) 2D-C cloud probe will <br />be used to record hundreds of two-dimensional snow crystal images per <br />second. Images are recorded on magnetic tape which can be processed to <br />determine crystal sizes and concentrations. Meteorological variables of <br />state are recorded every 10 seconds. The data tapes will be processed at <br />the Auburn field office and copies sent to Denver for archival. <br /> <br />b. The SCPP has arranged to borrow a ground grey scale precipitation probe <br />from the Atmospheric Environment Service in Canada. This is a two- <br />dimensional probe which measures particles in the size range 150 ~m - 9 mm <br />and was designed for ground operation without aspiration. This probe <br />offers the advantages of continuous monitoring of the snowfall, in a size <br />range not covered by the 2D-CO and without the complicating factors intro- <br />duced by aspiration. Information from this probe will be a useful addition <br /> <br />I II-19 <br />