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<br />1150 <br /> <br />1100 <br /> <br />1050 <br /> <br />FLOOD, JULY aI-AUGUST 1. 1976. BIG THOMPSON RIVER. COLORADO <br /> <br />1000 <br /> <br />950 <br /> <br />I lander Casper _.----.- <br />I . . r--- <br /> <br />-----"7 s~~~~s i <br /> <br />L laramie. Cheyenrye Sidney <br />Salt Lake .. -BIgTh(imps(Jh*FDrf'cotli~s-JGrave;---1 <br />City I' Canyon E Ip ------.... k "'.l I d .Sterling <br />stes ar \^:B~~~d~~ .AkrorL- __ ____--~- <br />Eagle )1\ . Denver <br />. /!y\ ~ limon I .Goodland <br />/ _ -: '.;.. - i <br />(, /\/\ . Palmer Ridge ' <br />I olorado Springs <br />, <br />I --~/ A^Pueblo I <br />( , \ Arkansas <br />: ---. ATrinidad River: <br />------__. 1__- ',/\. \ <br />, _n_ '~-Front--- --I -.------'--. <br />/ Range L_.______-----< <br />Continental I : <br />Divide I ! <br />: ' <br /> <br />12 <br /> <br />" <br /> <br />r---- - <br /> <br />---~ <br /> <br />------ <br />, <br /> <br />0-~-.'1 <br />I <br /> <br />400 <br /> <br />IGrand <br />Junction <br />, . <br /> <br />----. <br /> <br />350 <br /> <br />Winslow <br />. <br /> <br />, <br />I <br />I <br />I <br /> <br />. <br />Albuquerque <br /> <br />1100 <br /> <br />1050 <br /> <br />o <br />I <br /> <br />100 <br />I <br /> <br />FIGURE 7.-Location of geographic features in Colorado and surrounding States referred to in the meteorological discussion. <br /> <br />200 <br />I <br /> <br />300 <br />I <br /> <br />1000 <br />400 MILES <br />I <br /> <br />By 1200 MDT, the trailing front had moved into ex- <br />treme northeastern Colorado Ifigs. 14, 15). Behind this <br />front the winds were easterly with gusts as much as 25 <br />knots. Dewpoint temperatures remained equal to or <br />greater than 600F to the north of the leading front. <br />During the afternoon, the leading front remained <br />almost stationary along the foothills in northeastern <br />Colorado while the trailing front moved <br />southwestward at 15-20 knots. The cloud cover over <br />the area at 1200 MDT is shown in figure 16. <br />At 1320 MDT, a second rawinsonde was released at <br />Sterling, Colo. (fig. 17). By this time, the trailing front <br />was located 15-30 miles southwest of Sterling. The <br />data obtained from the rawinsonde were considerably <br />different from those data obtained earlier in that morn- <br />ing by the rawinsondes released from Denver and Ster- <br /> <br />. <br />Huron <br /> <br />\ <br />, <br />,_.... <br />(-- <br />\ <br /> <br />-_.~_. <br /> <br />. <br />I Rapid City <br /> <br />"-- <br /> <br />'.' <br />., <br /> <br />North <br />Platte <br />. <br /> <br />-' <br /> <br />~ <br />'. <br /> <br />400 <br /> <br />---~ <br /> <br />" <br />---""~" <br /> <br />" <br />\ <br /> <br />. <br />Dodge City <br /> <br />.- <br /> <br />Amarillo <br />. <br /> <br />350 <br /> <br />I <br />',~,."" <br />'-~- ................-- <br /> <br />.,,-. <br /> <br />,,,,,,/-.-"'J" <br /> <br />ling, Colo. Low-level moisture content had increased; <br />the average mixing ratio of the lowest 100-millibar <br />layer was 13.8 g/kg, an increase of 2.8 g/kg. The Lifted <br />Index had decreased from + 1 to -4, and the lifted con- <br />densation level had decreased to the 780-millibar level. <br />More importantly, the level of free convection had <br />decreased from the 480-millibar-level to the <br />640-millibar level. Precipitable water contents of 0.78 <br />inch in the lowest 150-millibar layer and 1.3 inches in <br />the layer from the surface to the 500-millibar level were <br />almost double the mean July values for Denver, Colo. <br />Below the inversion at the 720-millibar level, the winds <br />were easterly at 10-15 knots. Above the inversion, the <br />winds were westerly but light, indicating that Sterling, <br />Colo., was almost directly below the upper-level ridge. <br />The air behind the trailing front was characterized by a <br />