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<br />Not quite as evident as clogging was the problem of ice crystals being <br /> <br />blown off the belt due to wind. In one or two places, this was evident <br /> <br />by the distribution of crystals on the belt. In other places, remarks <br /> <br />made by the operator on the log sheets alerted us to a possible problem. <br /> <br />Again, these data were not used when blowing snow was evident or highly <br /> <br />probable. The wind shield added in 1973-74 reduced most of the errors <br /> <br />due to wind, at least during low wind conditions. <br /> <br />Fragmentation of crystals upon impact with the belt surface was still <br /> <br />a problem as with most replicators. The presence of large concentrations <br /> <br />of irregulars can be traced primarily to replication and classification <br /> <br />uncertainties. <br /> <br />Figure 8 shows examples of ice crystals obtained from the replicator on <br /> <br />the dates and times indicated. Of special interest is the preponderance <br /> <br /> <br />of heavy riming. The frame at 1642 MST on February 6 in Figure 8 shows <br /> <br /> <br />particularly well the occurrence of graupel. At 1208 MST on April 18, a <br /> <br /> <br />beautiful case of columns capped with dendrites occurred. These pictures~ <br /> <br />in general, are typical of the data collected, although some preference <br /> <br />was given to well-defined crystals for inclusions in these figures. <br /> <br />Rawinsonde runs were made at three to six hour intervals from Durango and <br /> <br />Pagosa Springs on experimental days. On experimental days, the wind was <br /> <br />such that the radiosonde from Pagosa Springs probably rose through the <br /> <br />cloud and reached cloud top not far upwind from the summit of Wolf Creek <br /> <br />Pass. The Durango sounding was normally displaced somewhat further upwind <br /> <br />from the crest. These rawinsonde observations give a reasonably good <br /> <br />-14- <br />