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<br />Pa ge 7 <br /> <br />water and water vapor passing over the site. <br /> <br />3. A dopp1er acoustic sounder system to provide profiles of wind <br />speed and direction above the site. <br /> <br />4. An optical imaging system that will provide data on the <br />concentrations, types, and sizes of falling ice particles. <br /> <br />5. A camera system for documenti ng ice crystal characteri sti cs. <br /> <br />6. A high resolution precipitation gauge for sensing even small <br />amounts of snowfall. <br /> <br />7. An optical tracking device (theodolite) to track small pilot <br />balloons (piba1s). The data from these will provide vertical <br />profiles of wind speed and direction. <br /> <br />8. Tower mounted sensors wi 11 provi de measurement of several <br />meteorological parameters. Parameters will include air tem- <br />perature, relative humidity, dewpoint temperature, atmospheric <br />pressure, wind speed and direction, and occurrences of icing <br />events. <br />These data will be recorded using automatic weather stations <br />known as PROBE (~.ortab1 e ,8.emote OBservations of the <br />In vi ronment) . <br />