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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />and wait until they either moved into the region or by-passed <br />the area. <br /> <br />Fortunately, from the SLW analysis, it seems there is <br />enough consistency in the usual appearance of the SLW to alert <br />personnel and commence storm monitoring before the SLW appears. <br />In most cases the appearance of SLW would be expected when <br />the system is still some 200 nautical miles upwind. with <br />the usual eastward translation speeds of between 15-30 knots <br />this would equate to 6-~2 hours or more before passage of <br />a front or trough. However, in this context forecasting has <br />been relegated to essentially now-casting with the greatest <br />need being the timely accessibility to weather observations <br />such as aviation hourly weather, satellite imagery and National <br />weather Service or project operated rawinsonde data. <br /> <br />3.2 Arizona Precipitation During the Field Season <br /> <br />Precipitation totals (in inches of liquid) for the mid-January <br />to mid-March, 1987, field season at each of the recording <br />gauge sites are listed in Table 3-2. Some of the gauges had <br />missing data, in which case the totals have been estimated <br />by doing an isohyetal analysis using storm totals from each <br />gauge with data and assigning a precipitation value for the <br />gauge with missing data. At Happy Jack, the gauge overflowed <br />during a portion of the February 23-26 storm and part of the <br />record was lost. However, bag snow samples were being taken <br />and weighed during the time the gauge overflowed (about 5 <br />hours) and the hourly totals during this period were calculated <br />from the bag samples by dividing the weight of the bag sample <br />(in grams) by the area of the bag sample collector (in sq. em.). <br />The January data begins on January 11 and includes the rest <br /> <br />3-20 <br />