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<br />7.3 Collection of Mesoscale pata: Format and Extent <br />7.3.1 Surface <br />TAMU personnel will collect all data from the fifteen speci.al <br />surface stations. This will consist of visiting each station on a schedule <br />of every other day, checking all equipment to insure that it is functioning <br />properly, annotating all charts appropriately, and changing charts as <br />necessary. Batteries and charts will be changed in the MRI automa.tic weather <br />stations as necessary. Data will be extracted from all charts and placed <br />on forms prepared for the purpose and mailed to Texas A&M University in <br />College Station for keypunching. These data will be extracted from the <br />strip charts immediately after the charts have been collected. <br />7.3.2 Rawinsonde Soundings <br />When a day has been declared a mesoscale operational day by Mr. <br />Riggio, soundings will be made at all four stations at 3-hr intervals for <br />a 12-hr period beginning at 1500 GMT (1000 CDT). Standard procedures will <br />be used for the recording of all appropriate data. These soundings will <br />be coded for each pressure contact on special forms prepared for this <br />purpose and mailed to Texas A&M University in College Station for keypunching. <br />7.4 Seeding Operations and Collection of Cloud Physics Data by Aircraft <br />7.4.1 Towering Cumulus <br />The Aztec and Navajo cloud physics airplanes will be used to obtain <br />as much information as reasonably feasible on natural and seeded c:umulus- <br />type clouds. The cloud selection schemes presented in Section 5 i.nclude <br />natural clouds which will be chosen for sampling on the same basis that <br />clouds are chosen for seeding. When more than a single seedable cloud is <br />present, the pilot of the seeding aircraft will select the cloud to be seeded <br />first based on his knowledge and experience. After the selection is made he <br />will open an envelope given him prior to departure which contains the type of <br />seeding to be performed, i.e. light, heavy, or none at all. Without reveal- <br />ing the type of seeding to be done, the pilot of the seeding aircraft notifies <br />the pilot of the cloud physics aircraft of his choice of clouds to be <br />seeded. The cloud physics aircraft will then make one pass through the <br />cloud at the -IOoC level immediately followed by a pass by the seeding <br />aircraft, and this pass followed by several additional passes by the cloud <br />physics aircraft. The first pass of ,the cloud physics airplane after <br />seeding will be at -SoC, and subsequent passes at -lOoC. The cloud physics <br />aircraft will continue to make passes through the cloud at the -lOoC <br />level until the cloud dissipates or becomes too intense for safe <br /> <br />24 <br />