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<br />- <br /> <br />Table 1. - Charactleristics of cumulus congest liS clouds <br />observed near Miles City~ Montana <br /> <br />Cloud-base height <br />Cloud-base temperatUl"e <br />Liquid water concentl"ation at <br />the -10 .C level <br />Ice concentration in updrafts <br />at the -10 oC level <br />Cloud-top height <br />Li fet ime <br />Radar echoing area <br /> <br />2.4 to 3.0 km m.s.l. <br />About +5 .C <br /> <br />0.5 to 1. 0 g/m3 <br /> <br />About 500 m-3 <br />6 km m.s.l. <br />0.5 hour <br />20 km2 <br /> <br />which suggests that, conservatively, ~bout 30 to 45 clouds could be <br />studied each season. There are other days that cumulus congest us <br />were observed growing out of fields of smaller cumu"'us or altocumulus <br />layers. It is probable that some of these clouds were suitable for <br />HIPLEX-l, which makes the estimate of 30 to 45 clouds per season even <br />more conservative. <br /> <br />Table 2. - Number of days on which relatively isolated <br />cumulus congestus clouds were observed during the <br />1200-2100 m.d.t. time period near <br />Miles City, Montana <br /> <br />1976 <br />May June July Total <br /> <br />1977 <br />May June July Total <br /> <br />1978 <br />May June July Total <br /> <br />5 <br /> <br />5 <br /> <br />8 <br /> <br />18 <br /> <br />17 <br /> <br />8 <br /> <br />4 <br /> <br />29 <br /> <br />8 <br /> <br />10 <br /> <br />9 <br /> <br />27 <br /> <br />o <br /> <br />Appendix A gives additional information about the physical characteristics <br />of the small cumulus congest us and their frequency of occurrence. <br /> <br />7 <br />