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<br />METEOROLOGY, HYDROLOGY, BIG THOMPSON RIVER AND CACHE LA POUDRE RIVER BASINS 49 <br /> <br />(/) <br />L.l.J <br />510 <br />z <br /> <br />Z 8 <br />-l" <br />-l <br /><( <br />u.. <br />Z 6 <br /><( <br />a: <br />L.l.J <br />> 4 <br /> <br />~ <br />~ 2 <br />:J <br />U <br /> <br />12 <br /> <br /> <br />I I I I t <br />Location in SE1ANW1A Sec. 31, T.8N.,R.70W., Larimer countr) <br /> <br />I Total=1O.24 in~hes (260 millimeters) .!.- <br /> <br />2400 1200 2400 <br />I AUG. 1 I <br />TIME, IN HOURS (MDT) <br /> <br />representation of rainfall distribution during the storm <br />period for those areas. In the Big Thompson River <br />basin, no continuous rainfall records were available but <br />radar data and eyewitness accounts provide a fair <br />description of the storm period. The North Fork Cache <br />la Poudre River basin in the vicinity of Virginia Dale <br />lies outside the range of the Limon radar; thus, the <br />timing of rainfall in that area is based entirely upon <br />eyewitness accounts. <br />Limon radar-image locations with relative inten- <br />sities are shown in figure 43 from 1701 to 2200 MDT <br />on July 31, 1976. The images are shown at 20-minute <br />intervals prior to 1900 MDT and at lo-minute inter- <br />vals thereafter. The first thunderstorm ce11s developed <br /> <br />I <br />I <br />I <br />I <br />(I- <br />I I <br /> <br />, <br />, <br /> <br />o <br />2400 <br /> <br /> <br />1200 <br />JULY 31 <br /> <br />1 <br />1,- <br />II <br />I <br />--f <br />I <br />1 <br />I <br />I <br />I <br /> <br />- <br /> <br />- <br /> <br /> <br />I <br />I Ft. Collins, <br /> <br />Larimer County <br /> <br />Total=7.9 inches <br /> <br />(201 millimeters) <br />I I <br /> <br />I I I <br />Allenspark, Boulder County I <br />Total=1.4 inches (36 millimeters) <br />i 1._. ........r. <br />._L-' ~""'I I <br /> <br />1200 <br />AUG. 2 <br /> <br />2400 <br /> <br />FIGURE 42.-CumuJative ralnfal1, at three stations in BouIdor end Larimer Counties, Colo., July 31- <br />August 2, 1976. <br /> <br />between 1800 and 1830 MDT several miles east of the <br />mAY;mum rainfall zone near Glen Comfort and Glen <br />Haven. <br />The storms were moving generally north- <br />northwestward and reached a temporary peak in inten- <br />sityaround 1845 MDT. Between 1900 and 1930 MDT, <br />the individual cells tended to merge, and the rainfall <br />pattern continued to shift slightly westward. By 1930 <br />MDT the most intense !'Ainf..ll.. were southwest of <br />Drake. From about 1930 MDT until shortly after 2100 <br />MDT, the "cloudburst" phase of the storm occurred in <br />the Big Thompson River basin around Glen Comfort. <br />The storm complex continued to shift very slowly to <br />the northwest, and after 2100 MDT, the most intense <br /> <br />-. <br /> <br />It? <br />