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<br /> <br /> <br />C=J <br /> <br />L' eDurango <br /> <br />37" U-U---1-h_h-L-.. <br /> <br />11 <br /> <br /> <br />..-L_.~._._.L-h_..----1-_..~ <br /> <br />100 MilES <br />I <br /> <br />50 <br />I <br /> <br />EXPLANATION <br /> <br />-2.0- LINE OF EQUAL MEAN PRECIPITATION <br />FOR JULY -Interval 0.5 inch <br /> <br />FIGURE 6.-Mean values of precipitation. in inches. occurring during July in Colorado (from National Oceanic and <br />Atmospheric Administration. 1973). <br /> <br />Lifted Index was + 1 and the level of free convection <br />was at the 480-millibar level. The average mixing ratio <br />in the lowest 100 millibars was 11 g/kg. Precipitable <br />water contents of 0.59 inch in the lowest 150-millibar <br />layer and 1.04 inches in the layer from the surface to <br />the 500-millibar level were similar to the amounts oc- <br />curring at Denver, Colo. <br />In summary, the morning analyses indicated that <br />the stage was set for significant thunderstorm activity <br />over a large area of the West. Abundant moisture, a <br />conditionally unstable thermal structure, and weak <br />vertical motions driven by the northward-moving <br /> <br />pressure trough were the major features of this en- <br />vironment. <br />The changing meteorological conditions during the <br />afternoon of July 31,1976, are shown in figures 14-24. <br />A surface analysis, radar summary, and Geostationary <br />Operational Environmental Satellite (GOES) <br />photograph are presented for 2-hour intervals begin- <br />ning at 1200 MDT and ending at 1800 MDT. After- <br />noon rawinsonde data taken at Sterling, Colo., supple- <br />ment the analyses. To make use of all available data, <br />aircraft altimeter settings were used to define the sur- <br />face pressure fields. <br />