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to the Bureau's P-E (Perkin Elmer) mini-computer via magnetic tape for final analysis. An extremely hydrophobic substance (Vellox) was applied to the system's reflector before installation to keep it clear of water and wet snow. However, there is some question as to whether the Vellox was applied correctly. The experience in Arizona was that whenever rain or wet snow fell, it was necessary to wipe the reflector dry at frequent intervals. A fan which blows air over the reflector worked quite well in keeping the plate clear, when dry snow was falling. Near real-time data from the radiometer was available through the Bureau's PROBE system, described later. The radiometer was housed in a transportable van which was located at the Happy Jack Ranger Station site (see Figure 2.1) near the top of the west (windward) slope of the Mogollon Rim. This site proved to be under the end of the SLW production zone for westerly flow, and just upwind of the lee subsidence zone. SLW was noted at the site with easterly flow as well, since the terrain begins to descend a few kilometers to the east. It was expected that measurements at this site would provide good estimates of the amount of SLW not naturally utilized as precipitation before entering downslope flow with associated evaporation. From the data collected during the field program it appears that the site selection was a good one as many hours of SLW were recorded. The radiometer arrived on site January 13, 1987 and was installed the next day. As soon as initial testing was completed (January 14), the unit was operated continuously in a vertical pointing mode until the end of the field season (March 17, 2-11 I I I I I I I , I I I I I I I I I I I