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<br /> <br /> <br />95" <br /> <br />90" <br /> <br />;'7Pomb:ariatyS1S;1;()ipooo GMT,'ol Aug'!~t 19'1:6. ReI." iO;legind 0!.fii!i5 f~ d~iall~. <br /> <br />rear of the front, and the first cells in the <br />area of Big Thompson were just beginning <br />to develop over the mountains southwest of <br />Ft. Collins. The smaller cumulus clouds <br />over northern Kansas, southwestern Ne- <br />braska, and northeastern Colorado had dis- <br />sipated as boundary layer cooling began. <br />Upper-air analyses indicated that the <br />large, negatively tilted ridge had intensi- <br />fied and developed northward during the <br />day. The cutoff high within the ridge had <br />drifted slightly southward over the Central <br />Plains, and the ridgeline extended from <br />western Kansas to central Montana. Warm <br />air aloft had suppressed development of <br />deep convection over the plains south of <br /> <br />26 <br /> <br />the surface front. \Vinds aloft over eastern <br />Colorado were east to south,southeasterly <br />at only 10 to 25 kt (5 to 13 m S-l). <br />Warm 700 mb (Fig. 21) temperatures <br />(2:160C) over western Colorado reflected <br />strong summer afternoon heating. The 500 <br />mb (Fig. 22) short wave extended in an arc <br />from central Nevada to New Mexico as it <br />continued to move north-~ortheastward. <br />The position of this short wave suggests <br />that falling pressures in western Colorado <br />were probably caused by a combination of <br />dynamical effects and the afternoon heat- <br />ing. High moisture content was evident <br />over the western United States ahead of <br />the trough. An unusually strong (for the <br />