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<br />SUMMARY OF 24 OCTOBER 1996 EXTR~:ME PRECIPITATION STUDY
<br />STORM LIST REVIEW WORKSIIOP AT OFFICE OF THE STATE: ENGlNEER,
<br />DENVER
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<br />Region 5, Colorado Plateau Storms
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<br />Candidate Storms
<br />
<br />1. Mesa Verde, Colorado, August 3,1924,3-5"/1 bour
<br />2. Blanding, Utab, August 1, 1968, 4-6"/U bours
<br />3. Doye CreekfBug Point, September 5-6, 1970, 6"
<br />
<br />Other Candidate Storms:
<br />Gateway, August 21, 1957
<br />Paeonia, August 8, 1968
<br />Delta, August 10, 1993, 3-4"/<2 h0urs (Robideau Creek)
<br />
<br />R.J. cited 5-7" rains occurred in Grand Junction area ca 19-10 tc 1995 and produced big runoffs and
<br />streamflows with no associated rainfall. T.M. stated CCC will go back and look at John's rep0l1 for
<br />evidence of such events. R.J. stated aIle can get pretty good estimates of rainfall by reconstru::tion using
<br />hydrological records.. His reconsuucted Opal rainfall ma'.ches well with lightning data. E.T. doesn't
<br />believe Mesa Verde storm is a driver.
<br />
<br />Region 6, Northern Basin
<br />
<br />Candidate Storms
<br />
<br />1. Western Colorado, October 10-15, 18951,6"/5 day;'
<br />2. Morgan, Utah, September 16, 1958, 8"
<br />3. Pyramid, September 20-24, 1961, 3-5"/2 days
<br />4. Sweetwater, Colorado, July 12, 1976,6"
<br />5. Opal, Wyoming, August 16, 1990,7"
<br />
<br />Other Candidate Storms:
<br />Rifle (Goyerument Creek), May 15, 1993
<br />NOIih Ogden, Utah, September 6,7,8,1991
<br />
<br />Questionable Storms:
<br />Gladstone, Colorado, October 4-5, 1911, 8.05"12-1 hours
<br />LeadyilIe, Colorado, July 27,1937,4.25"/-15 minutes
<br />Cimarron, Colorado, JUDe 3, 195?, 5.25"/75 minutes
<br />Grand Lake, Colorado, September 1985
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<br />Note: SiIyerton had a big rain eyent (4.05") same dare as Gladstone.
<br />
<br />RJ. commented that one of the largest floods occurred in 1938 trom Gladstone to Silverton on Cement
<br />Creek. N.D. showed observations associated with questionable "torms. Committee recorrunended that the
<br />record show that Leadville and Cimarron eV~nts along with Wolf Creek Pass eyent (August 20, 1995)
<br />should be discarded from consideration. JJi. and F.R. showed ,,,idence of extreme event at Ridgeway
<br />ISE on August 21, 1995, Conunittee agreed to add this eyent tc. appropriate region. RJ. notee[ that Rist
<br />Canyon has had bigger floods than the July 3 I ,August I, [976 eyenl. T.M. stated that lightning occurred
<br />simultaneouly from the Big Thompson north to Rist Carlyon and Poudre River
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<br />FER-[012S/96
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