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<br />- <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />NWS 11 May 2001 <br /> <br />IS. The region within which storms should have meteorologically homogeneous characteristics <br />with storms that could oc~ur over the Cherry Creek drainage basin is defined on Page 2 of the <br />Antecedent Study. The eastern most boundary of the region is 105.90 West longitude. In <br />comparing this eastern limit with the 29 storms in deriving the within/without storm curves in <br />HMR 52, there is no overlap. This appears to be stating that any storms east of 105.90 West <br />longitude are not to be considered to have meteorologically homogeneous characteristics with <br />the Cherry Creek drainage basin location. The only Colorado storm used in within/without <br />curves derivation in HMR 52 (Hale, 1935) does not fall within this region. This indicates an <br />inconsistency between this study and the site-specific PMP study. (Tomlinson) <br /> <br />The correct eastern boundary (jor the Cherry Creek Antecedent Study) is 104.30 <br />longitude. The group did not reach consensus. The NWS will examine a way to verify <br />this assumption. <br /> <br />Answer 15. The extreme eastern boundary of 104.30 longitude (between 36.90 and 37.50 <br />latitude only) is acceptable for that portion of The Antecedent Study concerned <br />with the Chatfield and Bear Creek drainages. The pertinent study for the Cherry <br />Creek basin is NWS HYDRO 45, Relationship Between Storms and Antecedent <br />Precipitation Over Kansas, Oklahoma and Eastern Colorado. HYDRO 45 is a <br />January 1995 study which developed antecedent precipitation relations for eastern <br />Colorado, e;lst of 1050 West. These antecedent values should be used for Cherry <br />Creek, as the Cherry Creek basin is entirely east of 1050 West. <br /> <br />13 <br />