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<br />SECTION 7. - 2D Images <br /> <br />Microphysical measurements at the ground were made possible this season by the <br />loan of a PMS 2D-gray probe and data acquisition system from the U.S. Army's <br />Cold Regions Research and Engineering Laboratory. The probe gives 64 element <br />resolution and 4 shades of intensity. The data acquisition system failed when <br />its environment was too warm or too cold, causing gaps in the data. The <br />probe1s clock did not keep in phase with the good data system clock, <br />especially during high snowfall rates. This caused small gaps between sample <br />intervals. After some tests in Montrose the system was used with an aspirator <br />at the snowlab at the Island Lake site on the Grand Mesa. In the valley the <br />hot wire measurements of aspirator flow rate ranged from 13 to 18 m/s. At the <br />snowlab they were about 12.3 m/s. <br /> <br />7-1 <br /> <br />