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<br /> <br />Figure 12c. GOES-1 photograph (visible channel, 1 km resolution at satellite sub,point) for 1S00 <br />GMT, 31 July 1976. <br /> <br />2.2 Regional Analyses from <br />1800 to 2200 GMT, 31 July <br />1976 <br /> <br />Hourly surface charts were plotted <br />and aualyzed for a region that included <br />Colorado and portions of nearhy states. All <br />available surface reports were used, along <br />with mdar and satellite data, so that the <br />movement and development of important <br />weather features could be followed. In <br />Figs. 12-17 these regional an"lyses are pre- <br />sented, at 2 h intelvals, along with corre- <br />sponding radar summary charts, GOES <br />satellite photographs, and additional Ster- <br />ling upper-air data. <br />At 1800 GMT the secondarv frontal <br />surge (Fig. 12a) had moved into the north- <br />eastern corner of Colorado, and surface <br />pressures were rising over N ehraska and <br />falling in western Colorado. Surface winds <br />were easterly and gusting from 20 to 25 kt <br /> <br />(10-13 m S-I) to the rear of this trail- <br />ing front. Dewpoint temperatures were <br />2:600F (15.50C) in the cooler air masses but <br />were considemhlv lower south of the lead- <br />ing front. The p;'essure analysis indicates <br />counter-gradient flow in parts of eastern <br />Colorado and the southern Plains. This was <br />thought to he a result of reduction <br />techniques rather than an actual feature. <br />Notice that the trailing front had just <br />moved past Sterling, <br />Radar and satellite data (Figs. 12h and <br />c) indicated that cumulus development was <br />OCCUlTing over the mountains, especially in <br />sonthern Colomdo and New Mexico, and a <br />squall line had already developed over <br />southwestern Utah. A large area oflow and <br />middle cloudiness, with some emhedded <br /> <br />15 <br />