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<br />SUMMARY OF 24 OCTOBER 1996 EXTREME PRECIPITATION STUDY
<br />STORM LIST REVIEW WORKSIIOP AT OFFICE OF THE STATE EJliGINEER,
<br />DENVER
<br />
<br />Colorado Storm Summa!'}', Climatology of Colorado's He:nk;t Rains. Nolan Doeskin, Colorado
<br />Climate Center, Colorado State University.
<br />
<br />· An examination ofSNOTEL data through 1995 shows hourly precipitation rates do decrea,:e with
<br />elevation. The period of record examined was generally between 15 and 20 years (I).
<br />
<br />· Six (6) Storm Regions haw been defined as follows (a map showing these Regions is attached to
<br />this Summa!'}):
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<br />1. Great Plains,
<br />2. Front Range and Eastern Foothills,
<br />3. Southwest Mountains.
<br />4. Northern Mountains.
<br />5. Colorado Plateau (southwest COlorado).
<br />6. Northern Basin (northwest Colorado).
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<br />* During Phase I, stonns 'were assigned to that region where they "maximized" but \,"ere also counted in
<br />other regions that they affected.
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<br />Comment by Ed Tomlinson:
<br />
<br />Utah stndy showed nearly mutual eXclusi"il)' between heal)' rain events arId severe weather
<br />producing events. He offered to provide a copy of the study referi,~nce to those interested.
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<br />Reliew of Storms by Region. Nolam Doeskin, CCCI CSJ.
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<br />Region 1, Great Plains:
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<br />1. Savageton, Wyoming, September 27-29, 1923, 17"/:/ da:,s
<br />2. HalelElbert, Colorado, May 30,31, 1935, 12-20"
<br />3. Plum Creek, Colorado, Jnne 13-20, 1965, many e,'cnts, Holly, Colorado> 11" 12~ hours (State
<br />Record)
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<br />Other Candidates:
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<br />Pro::pect Valley, Colorado, JilOe :12-13,1949,14"
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<br />Comments by McKee:
<br />* DAD curves are critical to studies of hea,:! rain cvcnts.
<br />* Factors of2 in rainfall variability over distances of less than 1 mile are .:::ommon ill extreme
<br />convective storms. Hence, their continues to be a need for post-s::onn precipitation suryeys.
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<br />Region 2, Front Range and Eastern Foothillls:
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<br />Candidate Storms:
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<br />1. PenroselPueblo, Colorado, June 2-6,1921,6-12"
<br />2. Gibson Dam, Montana, June 6-8, 1964, 16"
<br />3. Plnm Creek, Colorado, June 13-20, 1965, many events
<br />4. Big Elk Meadows, Colorado, May 4-8, 1969, 6,14"
<br />S. Rapid City, South Dakota, June 9,1972,15"
<br />6. Big Thompson Canyon!Rist CanyonJPoudre Riler, Colorado, July 31 to AUI~st 1, 19,'6, 12"
<br />7. Frijole Creek, Colorado, July 2-3, 1981, 8-16"
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