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<br />Growth Times <br /> <br />Ice particles which were sampled in a clean orographic system <br />with a well-defined upwind cloud edge, were appropriate in <br />size and shape for their growing conditions when compared to <br />the laboratory results. A crude model of this particular NW <br />flow cloud showed that if seeding had been effective <br />immediately at the upwind cloud edgE!, then there would be <br />sufficient time for crystals in the lower half of the cloud <br />to reach the ground before the strong subsidence region to <br />the lee of the Mesa. <br /> <br />Aspirator Intercomparison <br /> <br />A field intercomparison of two modes of using the (PMS 2D-C) <br />probe in a calm snowfall of dendrites and aggregates showed <br />that use of an aspirator resulted in 2.4 times the <br />cencentration recorded by the probe in horizontal (aircraft <br />style) orientation mounted on a moving truck. The <br />enhancement appeared to be similar at all sizes. The results <br />are not expected to apply to other habits like graupel. <br /> <br />27 <br />