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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />J <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />1 <br />I <br />1 <br /> <br />Comparing Table 4-2 with Table 4-4 one can see that most <br />releases began at least one hour prior to the detection of <br />the first SF6 plume. This was done purposely in order to <br />create a sizable plume for later detection. plumes continued <br />to be encountered for some time after the gas was shut off <br />at ground level. Winds tended to blow from the SW quadrant <br />on all occasions except March 16th when the area was under <br />a postfrontal wind flow pattern from the northwest. Temp~ratures <br />from the release sites indicate a rather mild temperature <br />regime for most of the ground releases with the exception <br />of the March 15-16 winter storm. A very intense storm did <br />move through the area on February 23rd and deposited sixteen <br />inches of snow in the Prescott region. Unfortunately, due <br />to snow removal problems at the Prescott Airport, the research <br />aircraft was unable to be removed from the hangar for several <br />days. This storm would have undoubtedly provided valuable <br />data although, due to the intensity of the associated snowfall, <br />it likely would not have been considered a suitable seeding <br />candidate. <br /> <br />4.4 Data Reduction <br /> <br />The Bureau of Reclamation provided North American Weather <br />Consultants with in flight data for all eight SF6 missions. <br />Variables which were used in the data analysis included raw <br />SF6 data, temperature, wind direction, wind speed, supercooled <br />liquid water, ice particle concentration, altitude, air speed, <br />potential temperature, vertical velocity, turbulence, dew <br />point, latitude and longitude. In addition, pibal data from <br />Happy Jack and raob data from Camp Verde were also provided. <br />North American Weather Consultants plotted the raob data for <br /> <br />4-13 <br />