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<br />will eliminate some fog occurrences from being considered. Note <br />that any fog and stratus decks remaining in the analysis must meet <br />the seedable layer criteria and, therefore, are considered to be <br />available for artificial seeding even though the mechanisms for their <br />formation may be different from those that form the orographic or <br />upslope cloud systems. <br /> <br />3. COLLECTION OF DATA <br />Fourteen High Plains rawinsonde stations were chosen for the data <br />analysis. For comparison, one additional station (Grand Junction, <br />Colorado) on the western slope of the Rocky Mountains was also in- <br />cluded, Each station's records for 10 years of rawinsonde observa- <br />tions were searched for the "cold season," September through April, <br />and all observations that satisfied the seeding model and the upslope <br />wind c;~ter~a were pooled for ana;Y~-s. Da:a i~cluded standard <br />surfc::e obsenatior.s taker "lea.... :he ':-;ne the l"aVl~nso~de was released, <br /> <br />as we~l as date take~ at the top ane base of the mcist layer. Figure 3 <br />shows the locations of the rawinsonde stations used in the analysis, <br />fi gure 4 the topography of the Hi gh Pl a i ns and its th ree regi ons, and <br />table 1 the 10 years of records for each station, We attempted to use <br />the same period for all stations, but availability of data dictated <br />that four stations have slightly different analysis periodS than the <br />other 11. <br /> <br />"'- <br /> <br />8 <br />