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<br /> <br />II <br /> <br />METEOROLOGY, HYDROLOGY. BIG THOMPSON RIVER AND CACHE LA POUDRE RIVER BASINS <br /> <br />9 <br /> <br /> <br />~'\ \ <br /> <br />\ <br /> <br />---';(' <br /> <br />Base modified from U.S. Geological Survey <br />1: 500,000, Slate base map, 1969 <br /> <br />10 <br />I <br /> <br />20 MILES <br />----' <br /> <br />CONTOUR INTERVAL 500 FEET <br /> <br />FIGURE 4.-Altitude range in area where flood originated. <br /> <br />large amounts of rain and hail often fall with these <br />storms, the precipitation is localized and of short dura- <br />tion. The 6-12 inches of rainfall observed on the eve- <br />ning of July 31, 1976, was several times the average <br />monthly value for July in northeastern Colorado. <br /> <br />METEOROLOGY OF THE STORM <br /> <br />Although the intense rainfall was confined to a nar- <br />row band along the foothills in northeastern Colorado, <br />meteorological processes on a much larger scale were <br />